bluuebunny/crossref_metadata_2025 huggingface dataset:
Exercise-induced knee joint laxity in distance runners.
Authors: Johannsen H V , Lind T , Jakobsen B W , Krøner K
Published: December 2008

The objectives of this study were to evaluate the effect of exercise on knee joint laxity. If exercise induced laxity is physiological, incorporation of this quality into a ligament replacement material would be indicated. Twenty recreational long distance runners average age 41 (range 24 to 50 yr) were tested before and immediately after 30 minutes of running. Using a computerized goniometer type instrument (Acufex KSS), knee flexion, axial tibial rotation and anterior-posterior tibial displacement were simultaneously recorded, while the runners underwent tests of static as well as dynamic knee joint laxity. At 30 degrees of knee flexion, a maximum increase of 16 per cent in mean total anterior-posterior laxity post-exercise was found. At the examination 30 minutes post-exercise, laxity at 30 degrees of knee flexion was still increased. However, laxity at 90 degrees of knee flexion had decreased to pre-exercise levels or below. Anterior tibial displacement, recorded during eccentric quadriceps activity (0 to 90 degrees of knee flexion) with weights attached to the foot, showed a maximum of 18 per cent increase in total anterior-posterior laxity post-exercise. It is suggested that the laxity increase is caused in part by a true ligamentous laxity increase, and in part by a decreased resting tone of the fatigued muscles.
A survey of shinty injuries in the Highlands during 1987-88.
Authors: Maclean J G
Published: December 2008

Shinty is an ancient game, related to hurling and hockey, that is played in the Highlands of Scotland. A survey of shinty injuries was carried out during one season. The injury rate and location of injuries is provided. A comparison is made with other ball sports.
Endurance fitness and blood lactate concentration during stepping exercise in untrained subjects.
Authors: Richardson S , Hardman A E
Published: December 2008

The purpose of the present study was to explore the possibility that reference blood lactate concentrations, determined during stepping exercise, could be used to derive an index of endurance fitness. The traditional measure of endurance fitness, maximal oxygen uptake (VO2max) and the individual relationships between blood lactate concentration and submaximal VO2 were determined during stepping for 10 untrained males. VO2 max values were 48.7 +/- 5.1 ml.kg-1.min-1 (mean +/- sd). The time to exhaustion during stepping at 80 per cent VO2 max (38.82 +/- 17.83 min) provided an additional measure of endurance fitness. The per cent VO2 max at a blood lactate concentration of 4 mM was correlated significantly with endurance time (rho = 0.75, P less than 0.05). These results show that a submaximal step test can be used to determine oxygen uptake and per cent VO2 max at a reference blood lactate concentration. However, for this group of subjects, per cent VO2 max at a blood lactate concentration of 4 mM showed only a modest correlation with endurance.
Effects of a task-specific warm-up on anaerobic power.
Authors: Hawley J A , Williams M M , Hamling G C , Walsh R M
Published: December 2008

Twenty-four untrained (UT) males (age 21 +/- 2.5 yr, height 1.77 +/- 0.05 m, weight 75.3 +/- 10.1 kg, values mean +/- SD) performed the Wingate Anaerobic Test (WT) under two conditions, cold (C) and following a warm-up (WU). Trials were separated by a minimum of 48 h. A modified Monark 818 cycle ergometer was interfaced with an Apple IIE microcomputer and peak power (PEAK), mean power (MEAN) and fatigue index (FI) determined. The WU trial consisted of an 8 min incremental continuous cycling bout (cadence 90 rev.min-1) with 5 min rest before the WT. During the C trial subjects completed only the WT. A repeated measures design was employed with order of trials counterbalanced. ANOVA revealed no significant differences for PEAK or MEAN between WU or C conditions. However FI was significantly greater (p less than 0.05) following the WU. A significant correlation (r = 0.45, p = 0.03) was obtained between WU intensity and FI. These findings suggest that our UT subjects were fatiguing themselves during the WU. Future studies are needed to assess whether a task-specific WU in which FI is not impaired would lead to improvements in PEAK and MEAN. Investigators should be aware that a self-spaced WU may increase FI in the WT in UT subjects.
Ankle taping: support given by different materials.
Authors: Capasso G , Maffulli N , Testa V
Published: December 2008

Three different adhesive and two non-adhesive tapes were used by three operators to assess the compressive action exerted on the ankle at the moment of strapping, during different phases of gait, and after some days of treatment in ten volunteers. Only the adhesive tapes were still able to prevent swelling after five days. They should be used if a prolonged compressive action is required.
Physiological profiles of young boys training in ballet.
Authors: Pekkarinen H , Litmanen H , Mahlamäki S
Published: December 2008

In order to evaluate physiological characteristics in young male ballet dancers, 27 boys (aged 9 to 16 years) who participated in a boys' dance course during the Kuopio Dance and Music Festival in June 1988 were studied. In general, the boys had started dancing at the age of 8.6 years and had been training for 4.1 years. They had, on average, three dancing sessions per week and the mean time spent on dancing was four hours per week. In the study, some anthropometric measurements were taken, the maximal oxygen uptake (VO2 max) was measured by a cycle ergometer test and the explosive strength and the mechanical power of lower extremities were evaluated by a jumping test. The results indicate that boys who train in ballet are in general moderately lean, have relatively small body size and a high degree of flexibility. The younger boys especially have only moderate aerobic power, but both explosive strength and mechanical power in leg muscles are good in ballet trained boys.
Brucella arthritis of the knee in a young soccer player.
Authors: Chen S
Published: December 2008

A case is presented of brucella arthritis of the knee in a young soccer player. The diagnosis is outlined, together with possible errors of observation.
Effectiveness of taping for the prevention of ankle ligament sprains.
Authors: Firer P
Published: December 2008

The effectiveness of taping in the prevention of sports injuries has only been studied in detail with regard to the lateral ligaments of the ankle. It appears that taping can protect against injury. The mechanism by which taping works is not certain, but mechanical factors play a role which decreases with exercise. The major effect of taping may be its proprioceptive effect on underlying muscle groups.
Protective capability of bicycle helmets.
Authors: Mills N J
Published: December 2008

Cycle helmets that meet UK and US standards have been tested. The mechanisms of energy absorption for frontal and side impacts have been analysed. A good helmet should protect the wearer for impacts up to 15 mph into a rigid flat surface.
Tennis elbow: an ultrasonographic study in tennis players.
Authors: Maffulli N , Regine R , Carrillo F , Capasso G , Minelli S
Published: December 2008

The findings of ultrasound examination at and around the lateral humeral epicondyle in 41 tennis players suffering from so called tennis elbow are reported. Ultrasound examinations were performed with a real time ultrasound machine. The tenderness and functional impairment of tennis elbow may be caused by several different lesions, at times appearing in association. Six ultrasonographic characteristics could be identified: Enthesiopathy The proximal part of the tendon was enlarged and there were echogenicity alterations. Tendonitis The tendon of the extensor carpi radialis brevis was enlarged and areas of dyshomogeneous hypoechogenicity were evident with loss of the normal microscopic waveform structure of the tendon collagen. Peritendonitis A thickening of the peritendonous lining was present. Bursitis A bursa was located on the inferior surface of the tendon of the extensor carpi radialis brevis. Intramuscular haematoma Some circular or ovoid hypoechogenic areas within the muscular substance of the extensor carpi radialis brevis were evident. Mixed lesions These were not correlated with the intensity and the duration of the symptoms. Ultrasonographic examination gives a detailed ++image of the structures involved in the tennis elbow syndrome, confirms the diagnosis, and may be useful in monitoring treatment.
Orofacial injuries and international rugby players' attitudes to mouthguards.
Authors: Chapman P J
Published: December 2008

This is the first such study of British rugby and the third yet published, the other two involving the 1984 Australian Wallabies and the 1987 United States Eagles. The report shows that while all 30 players believed mouthguards provided local protection, nine did not wear a mouthguard. Only one of the 21 who wore a mouthguard was willing to play without it, while eight mouthguard wearers felt mouthguards should be compulsory for adult rugby players. Twelve players had previously sustained an orofacial injury playing rugby which required treatment, only one of whom was wearing a mouthguard at the time. The full results are presented and compared with those of the previous two reports.
Cervical vertebral dislocation in a rugby player with congenital vertebral fusion.
Authors: Scher A T
Published: December 2008

Congenital cervical vertebral fusion is an anomaly which decreases the normal range of spinal movement and predisposes to trauma. The case history of a rugby player with a congenital fusion who sustained permanent quadriplegia after dislocation of the lower cervical spine is presented. The mechanism of injury is discussed. A plea is made for routine radiographic examination of the cervical spines of all rugby players in order to detect the presence of vertebral fusion and other conditions which may predispose to spinal trauma.
Effects of ibuprofen on exercise-induced muscle soreness and indices of muscle damage.
Authors: Donnelly A E , Maughan R J , Whiting P H
Published: December 2008

Thirty-two volunteers participated in a two-period crossover study in which ibuprofen was tested against an identical placebo for its effectiveness in reducing muscle soreness and damage after two bouts of downhill running. Subjective soreness, quadriceps isometric strength and isometric endurance time at 50 percent of maximum strength, serum activities of creatine kinase, lactate dehydrogenase and aspartate transaminase and serum levels of creatinine and urea were recorded at intervals up to 72 hours after exercise. Each downhill run produced muscle soreness, and a decline in muscle strength and 50 percent endurance time, although these parameters were unaffected by ibuprofen treatment. All serum parameters measured increased after both runs, but for the three enzymes this increase was smaller after the second run. Serum creatine kinase and urea levels were higher in the ibuprofen group after both runs. These results indicate that ibuprofen is not an appropriate treatment for delayed onset muscle soreness and damage.
Overtraining syndrome.
Authors: Budgett R
Published: December 2008

This review discusses the overtraining syndrome which is characterized by fatigue and underperformance precipitated by stress of training. Other stresses, depression and an increased susceptibility to infections may be important. Treatment requires rest and a stress management program over 3 months.
Rest in underperforming elite competitors.
Authors: Koutedakis Y , Budgett R , Faulmann L
Published: December 2008

This study examines the effects of 3-5 weeks of physical rest on selected physical, physiological and psychological parameters obtained from 12 Olympic but latterly underperforming competitors and their matched control subjects. Cardiorespiratory data were directly determined from their work to volitional exhaustion on either a treadmill, cycle, or rowing ergometer. Anaerobic power and capacity were evaluated through modified Wingate tests. For psychometric assessments, the Profile of Mood States (POMS) was used. For the Olympic competitors, one-way analyses of variance (ANOVA) revealed significant increases (p less than 0.05) in body weight, maximum respiratory exchange ratio, maximum oxygen consumption, and heart rate at the anaerobic threshold, following the rest period. There was also a significant reduction in fatigue and mood profile score, and a significant increase in vigour. No significant changes were found in the matched control subjects. The present data show that resting for 3-5 weeks assists underperforming elite competitors to improve their aerobic performance.
Injuries at the BMX Cycling European Championship, 1989.
Authors: Brøgger-Jensen T , Hvass I , Bugge S
Published: December 2008

At the BMX Cycling European Championship in 1989 with 976 participants of both sexes, aged between six and 40 years, all injuries were registered. A total of 6.3% of the participants sustained injuries (1.6% per individual start), 52.5% required medical attendance and 3.3% necessitated hospital admission. Women were injured twice as frequently as men. Most injuries, 72.1%, were minor, 6.6% were fractures with 75% of the fractures affecting the upper limbs. BMX bicycle riding has the high injury risk of 1190 injuries per 1000 competition hours.
Gender verification in sport: the need for change?
Authors: Ferguson-Smith M A , Ferris E A
Published: December 2008

Most of an estimated one in 504 sportswomen fail the gender verification test unjustly. Until clinical examination becomes acceptable, a new code of practice is proposed which avoids unfair disqualification.
Wetsuits, body density and swimming performance.
Authors: Cordain L , Kopriva R
Published: December 2008

To determine the influence of body composition upon swimming performance with and without wetsuits, 14 competitive female swimmers (mean (s.d.) age, 19.9 (0.9) years) were measured for body density while wearing both wetsuits and normal swimsuits. Subjects swam 400 and 1500 m trials with and without wetsuits, randomly, over a 12-day period. Six subjects participated in an additional trial while wearing neoprene leg-bands fitted over the wetsuit. Mean (s.d.) subject density without and with wetsuits was 1.048 (.009) and 1.021 (.007) g/ml respectively. Wetsuits reduced (P less than 0.05) swim times for the 400 (-4.96%) and 1500 m swim (-3.23%) compared with swimsuit trials. The neoprene bands increased (P less than 0.05) swim times relative to swimsuit and wetsuit trials. With wetsuits, swim times were inversely (P less than 0.05) related to density for the 400 (r = -0.46) and 1500 m swim (r = -0.54) suggesting that wetsuits increase performance by increasing buoyancy and that lean subjects benefit more from wearing wetsuits than do fatter subjects.
Carbohydrate loading in practice: high muscle glycogen concentration is not certain.
Authors: Fogelholm G M , Tikkanen H O , Näveri H K , Näveri L S , Härkönen M H
Published: December 2008

It is believed that muscle glycogen resynthesis can be stimulated by depleting the glycogen stores by heavy physical exercise and then eating a diet rich in carbohydrates. In this study, we compared muscle glycogen concentrations after two different depletion and loading procedures in six male runners. The depletion runs for the procedures were a half-marathon race and an easier fartlek. The mean muscle glycogen concentrations (+/- s.e.m.), analysed after the procedures, did not differ significantly between the race and the fartlek being 285 (+/- 25) mmol/kg d.w. (dry weight) versus 315 (+/- 32) mmol/kg d.w. (P greater than 0.05). Moreover, the subjects' glycogen concentrations were not clearly increased above the predepletion values following either procedure. The results show that higher glycogen levels do not necessarily occur after classical carbohydrate-loading procedures.
Temporomandibular dysfunction syndrome associated with scuba diving mouthpieces.
Authors: Hobson R S
Published: December 2008

As previous reports have highlighted that temporomandibular joint dysfunction syndrome can occur during scuba diving due to the use of a diving mouthpiece, 74 divers of varied experience (62 male, 12 female) were asked to evaluate the efficiency of the mouthpiece for the ease of grip, insertion into the mouth, clearing of water, air sharing, comfort and overall efficiency. They also recorded the level of muscle and joint discomfort experienced during diving and non-diving activities. The results indicate that temporomandibular joint problems unrelated to diving are compounded by the use of a diving mouthpiece. The diver's assessment of muscle tension and comfort while using the mouthpiece was found to be a good predictor of whether temporomandibular dysfunction would occur and the assessment scores have been used in a formula to aid selection of a mouthpiece.
Catastrophic rugby injuries of the spinal cord: changing patterns of injury.
Authors: Scher A T
Published: December 2008

In reports from the UK and New Zealand, it is noted that the incidence of rugby injuries to the cervical spinal cord has dropped and that the percentage of players injured in the tackle has similarly decreased. In contrast, this does not appear to be the pattern in South Africa and an analysis has therefore been made of 40 rugby players sustaining injuries to the spinal cord during the period 1985 to 1989. The radiological appearances on admission have been correlated with the circumstances of injury, associated orthopaedic injuries and neurological deficits. The tackle was responsible for the majority of injuries, causing more than the scrum. Tackles were also responsible for more cases of complete, permanent quadriplegia than the scrum. The commonest cause of injury in players being tackled was the high tackle around the neck, while the commonest cause of injury in players making the tackle was the dive tackle. This survey has shown that the tackle is now the major cause of spinal cord injury in South African rugby, in contrast to earlier analyses in which the scrum was identified as the most common cause.
Pilot study of the epidemiology of sports injuries and exercise-related morbidity.
Authors: Nicholl J P , Coleman P , Williams B T
Published: December 2008

In the pilot phase of a national study of the incidence of exercise-related morbidity (ERM), funded by the Sports Council, a questionnaire about recent participation in 'active sports and other recreational activities involving vigorous physical exercise' and associated injuries or illnesses was sent to a sample of 6744 people aged 16 to 65 years in two areas. Interviews with 101 respondents were held to validate the questions. Return rates of 73 and 81% from the two areas were achieved and results from the interviews indicated that sports and injuries were being reported sufficiently accurately on the postal questionnaires to yield reliable information. Of the 4961 usable returns, a total of 1249 respondents (25%) reported taking part in some activity in the 4 weeks before completing the questionnaire, and 137 (3%) reported 158 injury incidents. Nearly half (76, 48%) of these incidents resulted in some restriction in activity, and 21 resulted in some restriction in activity, and 21 resulted in a visit to a hospital casualty department. It is estimated that nationally 1-1.5 million episodes of ERM result annually in attendance at a hospital casualty department, and 4-5 million episodes of ERM result in some, usually temporary, incapacity.
Hazards of horse-riding as a popular sport.
Authors: Silver J R , Parry J M
Published: December 2008

The increasing incidence of horse-riding accidents, which are often severe in nature, prompted a pilot study of a questionnaire designed to elucidate the cause of such accidents. It was hoped that, on a larger scale, the information gleaned would highlight possible preventative measures which might improve the safety of an important recreational pursuit enjoyed by young and old from many walks of life. A retrospective study of riders sustaining serious spinal injuries admitted to Stoke Mandeville Hospital was compared with riders sustaining minor but significant injuries as the accidents came to the attention of the authors. The detailed analysis paid particular attention to the setting and to the experience and task of horse and rider. It was found that 70% of the 20 accidents could be thought attributable to the behaviour of the horse at the time, and seven of these were in the spinal injuries group. Rider error was a significant contribution in seven cases, and in two instances the rider was under instruction at the time. There was also inadequate experience of the rider in seven cases, of which five were thought to show inadequate supervision. The limited number of cases studied precludes significant observations, but, as the majority of accidents seemed preventable, a larger study has been initiated in collaboration with the British Horse Society.
Comparison of clinical tests and the KT1000 in the diagnosis of anterior cruciate ligament rupture.
Authors: Graham G P , Johnson S , Dent C M , Fairclough J A
Published: December 2008

A prospective study was undertaken to compare the accuracy of the Lachman test, anterior drawer test and jerk test with the KT1000 knee arthrometer in patients with proven anterior cruciate ligament deficiency. The Lachman and anterior drawer tests were found to be the most accurate indicators of anterior cruciate ligament deficiency. The KT1000 knee arthrometer was found to be totally inaccurate, which precludes its use as an objective measure of anteroposterior laxity of the knee.
Paragliding injuries.
Authors: Krüger-Franke M , Siebert C H , Pförringer W
Published: December 2008

Regulations controlling the sport of paragliding were issued in April 1987 by the German Department of Transportation. The growing popularity of this sport has led to a steady increase in the number of associated injuries. This study presents the incidence, localization and degree of injuries associated with paragliding documented in Germany, Austria and Switzerland. The 283 injuries suffered by 218 paragliders were documented in the period 1987-1989: 181 occurred during landing, 28 during starting procedures and nine during flight. The mean patient age was 29.6 years. There were 34.9% spinal injuries, 13.4% upper extremity injuries and 41.3% lower limb injuries. Over half of these injuries were treated surgically and in 54 instances permanent disability remained. In paragliding the lower extremities are at greatest risk of injury during landing. Proper equipment, especially sturdy footwear, exact training in landing techniques as well as improved instruction in procedures during aborted or crash landings is required to reduce the frequency of these injuries.
Motor racing accidents at Brands Hatch, 1988/9.
Authors: Chapman M A , Oni J
Published: December 2008

Little is known about the incidence of injury to race track motor-cyclists and car drivers. In a 1-year study at Brands Hatch, 70 of 33,184 competitors required hospital treatment. We found this injury rate to be higher than on the public highway. However, the anatomical distribution of injury caused by motor-bike accidents is similar to that found on the public highway. Motor-cyclists are more likely than car drivers to sustain limb trauma requiring outpatient treatment only. The number of participants requiring admission to hospital is broadly similar for car and bike races, being less than 0.1%.
Connective tissue massage.
Authors: Goats G C , Keir K A
Published: December 2008

Connective tissue massage (CTM) is a manipulative technique that facilitates the diagnosis and treatment of a wide range of pathologies. Observation and subsequent manipulation of the skin and subcutaneous tissues can have a beneficial effect upon tissues remote from the area of treatment. These effects appear to be mediated by neural reflexes that cause an increase in blood flow to the affected region together with suppression of pain. CTM is becoming accepted more widely as research confirms the claims of an expanding population of practitioners.
Upper limb fractures in rugby in Huddersfield 1986-1990.
Authors: Eyres K S , Abdel-Salam A , Cleary J
Published: December 2008

Most injuries sustained by rugby players affect the soft tissues, and fracture is relatively uncommon. Whereas the lower limb is most affected in footballers, the upper limb tends to be injured in rugby players. Thirty consecutive fractures and ten dislocations affecting the upper limb, sustained by 35 rugby players, are reported.
Effects of cooling the legs on performance in a standard Wingate anaerobic power test.
Authors: Crowley G C , Garg A , Lohn M S , Van Someren N , Wade A J
Published: December 2008

The possibility that peripheral hypothermia may impair muscular performance in various sports led us to assess the usefulness of the Wingate anaerobic power test in subjects with normal and cooled leg muscles. Using this test without modification, peak power, average power output, and cumulated work to the point of fatigue were all decreased by cooling, although the fatigue index (the declining rate of change of power output) was less. It is concluded that this test could usefully be employed in field studies to assess the possibility that muscle chilling may influence a person's potential for producing maximal bursts of muscular work.
Sports medicine in New Zealand.
Authors: Milne C J
Published: December 2008

Sports medicine in New Zealand is characterized by a team approach. Experienced professionals work together to the benefit of athletes, be they elite performers or those in sport for purely recreational purposes. A no-fault accident compensation scheme is used to provide speedy access to treatment services for those injured in sport and also for advice on accident prevention. Recent initiatives include a task force on drugs in sport and the creation of regional sports foundations. Sports medical education is a prominent part of the New Zealand scene.
Fall in skin temperature of exercising man.
Authors: Torii M , Yamasaki M , Sasaki T , Nakayama H
Published: December 2008

Fall in skin temperature during initial muscular work was investigated in ten healthy men. Bicycle exercise was performed at workloads of 50-150 W in a climatic chamber at ambient temperatures of 10-40 degrees C (relative humidity 45-55%). Skin temperatures at seven or eight points over the body surface were measured using thermography and thermocouple recording systems. Sweat rates were significantly higher at 40 degrees C than at 30 degrees C, whereas the fall in skin temperature was almost equal. The reduction of skin temperature during exercise was the same throughout the year, although sweat rate was significantly higher in summer than in winter. In coloured thermographics of the skin temperature distribution during exercise of both 50 and 150 W at 10 or 20 degrees C, the skin temperature began to decline immediately at the onset of the exercise. Increased work intensities reduced skin temperature. The results suggest that fall in skin temperature during initial exercise was not due to increased evaporative cooling but to vasoconstriction, probably caused by non-thermal factors.
A comparative study of the metabolic effort expended by horse riders during a jumping competition.
Authors: Gutiérrez Rincón J A , Vives Turcó J , Muro Martínez I , Casas Vaqué I
Published: December 2008

The three main Olympic horse riding disciplines are dressage, jumping, and three-day eventing (including dressage, cross country and jumping). In the jumping discipline (obstacle race), the 'team' (horse rider) is judged under the different conditions that might take place in a varied run. The horse is expected to show power and ability; the rider must show riding skill and good physical condition. However, the different conditions encountered by the rider during competition (duration of event, continuous isometric working level, especially in the inferior trunk, lead us to consider the need for a rider to develop different metabolic pathways to meet the high energy requirements of the competition.
20-MST and PWC170 validity in non-Caucasian children in the UK.
Authors: Mahoney C
Published: December 2008

The validity was investigated of 20-MST (20 Metre Endurance Shuttle Run Test) and PWC170 (Physical Working Capacity) field tests with laboratory-measured peak oxygen uptake (VO2peak) in a multiracial UK population of 12-year olds: 103 subjects completed the 20-MST and 96 of these completed the PWC170. To assess validity, a laboratory treadmill test was completed by ten boys and ten girls who had performed both field tests. VO2peak was 43.8 ml kg-1 min-1 for boys and 38.5 ml kg-1 min-1 for girls. Pearson product-moment correlation showed 20-MST to be a reliable measure of cardiorespiratory fitness (r = 0.83, boys; r = 0.76, girls, P less than 0.03), while correlations with PWC170 were lower (r = 0.64, boys; r = 0.54, girls) and not significant. The 20-MST was consistent in retest (n = 20) - reliability coefficients r = 0.73, boys; r = 0.88, girls; P less than 0.01. The results suggest 20-MST is a valid, measure of fitness in this population when compared with VO2peak. PWC170 is less valid, possibly due to cultural and social backgrounds. The cycle test was inappropriate in this population, especially for girls unaccustomed to exercise and cycling. The 20-MST test is recommended for large groups of children when facilities are limited. It requires limited skill or habituation and is relatively non-invasive.
First-aid supplies for backpacking.
Authors: Puretz S L
Published: December 2008

A portable first-aid kit should be carried in the backpack of campers, hikers, and anyone who expects to spend time in a remote and unoccupied area. That is the recommendation found in lay texts dealing with medical care, in backpacking books, as well as in articles appearing in popular magazines. It goes without saying that it is far better to practise safety and prevention than to have to use first aid. However, many times medical problems occur which no amount of safety and forethought could have prevented. Information in this paper indicates that hikers are generally well prepared for the health-related problems they encounter. Hikers carry diverse supplies to meet health problems but there are some basic supplies with which hikers start their long-distance sojourn. Those supplies and their usage rates are discussed, as are attitudes toward using the supplies.
Adenosine in exercise adaptation.
Authors: Simpson R E , Phillis J W
Published: December 2008

By influencing the regulation of the mechanisms of angiogenesis, erythropoietin production, blood flow, myocardial glucose uptake, glycogenolysis, systolic blood pressure, respiration, plasma norepinephrine and epinephrine levels, adenosine may exert a significant effect on the body's adaptation response to exercise. However, adenosine's possible influence over the vasodilatory response to exercise in skeletal muscle is controversial and more research is required to resolve this issue. Various popular exercise training methods, such as cyclic training, interval training, and the 'warm down' from training may increase adenosine levels and thereby might enhance the response of adenosine-influenced adaptive mechanisms. Among the several classes of drugs which may enhance extracellular adenosine levels and thereby might augment adenosine-influenced adaptive mechanisms, are the anabolic steroidal and some readily available non-steroidal anti-inflammatory drugs (NSAIDs).
Changes in blood glucose levels during a 1005-km running race: a case study.
Authors: Abernethy P J , Eden B
Published: December 2008

The blood glucose response of a male ultramarathon runner was monitored throughout a 1005-km race. Before the race the runner had a fasting blood glucose concentration of 5.1 mM. At no stage during the race were his mean blood glucose levels less than 5.8 mM. This was partially attributed to the eating patterns of the athlete, the times at which blood samples were taken, the glycaemic index of food ingested and hyperglycaemia. While there was no evidence of glucosuria, ketones were present in the urine on one day of the event. There were other signs suggesting that at various stages of the event the runner had a metabolic acidosis. Possible reasons for this are discussed.
Volleyball injuries: a survey of injuries of Scottish National League male players.
Authors: Watkins J , Green B N
Published: December 2008

Injuries sustained in male volleyball players in the first division of the Scottish National League during the 1989-1990 season were investigated by means of a questionnaire survey. Forty-six injuries were reported, representing an incidence of 0.53 injuries per player. Damage to muscles, tendons and ligaments accounted for most of the injuries. The cause of most injuries was blocking or spiking. In 74% of cases the injured players were able to resume training and playing within 2 weeks of the injury. In 10% of cases the injured players were unable to train or play for 7-14 weeks.
Evaluation of abnormal biomechanics of the foot and ankle in athletes.
Authors: Kannus V P
Published: December 2008

Athletes often suffer from recurrent or chronic overuse symptoms of the lower extremities. During the office visit it is essential to analyse the patient's shoes, gait cycle, lower extremities and, especially, the talocrural, subtalar and more distal joints of the ankle and foot. The basic (clinical) biomechanical analysis can be supplemented by radiographs, treadmill and video analysis and mirror table (podoscope) examinations. Ideally, successful pain relief by correction of the observed abnormality with an orthotic device completes the diagnostic procedure, especially if symptoms return soon after the removal of the device. In treatment custom-made, expensive orthotics should not be prescribed for overuse symptoms without an obvious malalignment, for asymptomatic athletes with a malalignment, or for symptoms in which the causal relationship between the biomechanical abnormality and symptoms is difficult to see. Strict indications for prescription of orthotics and close cooperation between the attending physician, physical therapist and orthotist are prerequisites for obtaining good, long-lasting results.
Ocular fundus lesions in sports divers using safe diving practices.
Authors: Holden R , Morsman C D , Lane C M
Published: December 2008

Ocular fundus fluorescein angiography was performed on 26 divers, who had used safe diving practices for at least 10 years, and on seven controls. There was no significant difference in the incidence of macular abnormalities between these groups and those of a previous study. Adherence to safe diving practice confers some protection against the macular abnormalities known to occur in divers with a history of decompression sickness.
Kenyan team care at the Special Olympics--1991.
Authors: Wekesa M , Onsongo J
Published: December 2008

The Kenyan team that competed at the International Summer Special Olympics comprised 38 athletes (both men and women) selected from all competitors at the national championships. The team was examined and a physiological fitness test carried out. The results enabled the organizers to arrange for treatment of prevailing illnesses, and the training programme was adjusted to the athletes' level. This team was voted the best team of the month of July, having won 33 gold, three silver and two bronze medals. Sound medical care of athletes should be taken before and during competition. Such management should aim at minimizing injuries and enabling athletes to perform at their best.
Muscle power predicts freestyle swimming performance.
Authors: Hawley J A , Williams M M , Vickovic M M , Handcock P J
Published: December 2008

The purpose of this study was to determine the relationship between non-invasive laboratory measures of 'muscle power' and swim performance over sprint (50 m) and middle-distance (400 m) events. Twenty-two swimmers performed an upper and lower body Wingate Anaerobic Test (WAT) and a maximal sustained power output test (MPO) for the upper body. Peak power (PP) and mean power (MP) were determined for the WAT, while peak sustained workload (WLpeak) was determined for the MPO. Timed swims over 50 m and 400 m were undertaken by all swimmers during which the number of arm strokes per length was recorded. Highly significant relationships were found between sprint-swim speed (S50) and mean power of the arms (MP(arms)) (r = 0.63, P less than 0.01), between S50 and mean power of the legs (MP(legs)) (r = 0.76, P less than 0.001) and between S50 and the distance covered with each arm stroke (DS) (r = 0.91, P less than 0.001). Multiple regression analyses revealed that WAT power indices for the legs did not significantly increase explained variance in S50 above that of the arms. The relationship between WL(peak) and S400 was highly significant (r = 0.70, P less than 0.001) and indicates the importance of arm power in the longer distance swim events.
Rectus sheath haematoma in a canoeist.
Authors: Maffulli N , Petri G J , Pintore E
Published: December 2008

A 26-year-old male canoeist was referred with a 10-day history of abdominal pain, and a palpable mass in the left upper quadrant. No history of direct trauma was given. He was not taking any medication, and malignancy and inflammatory conditions were considered in the differential diagnosis. Ultrasonographic scan identified a mass originating in the rectus abdominis sheath. Ultrasonographically guided aspiration yielded some partially clotted blood, confirming the clinical diagnosis of rectus sheath haematoma. After conservative treatment, the patient resumed training, and is fully asymptomatic 1 year after discharge.
Daily physical activity and blood lactate indices of aerobic fitness in children.
Authors: Welsman J R , Armstrong N
Published: December 2008

This study examined the relationship between daily physical activity and aerobic fitness in 11-16-year-olds. Habitual physical activity was assessed in 28 boys (mean(s.d.) age 13.6(1.3) years) and 45 girls (mean(s.d) age 13.7(1.3) years) from minute-by-minute heart rate monitoring during 3 school days. Aerobic fitness was assessed by determining the percentage peak VO2 at blood lactate reference values of 2.5 and 4.0 mmol l-1 during incremental treadmill running. The 4.0 mmol l-1 level occurred at a mean(s.d.) value of 89(7)% peak VO2 in both boys and girls and mean(s.d.) values at the 2.5 mmol l-1 level were 82(9)% peak VO2 in girls. Mean(s.d.) percentage time with heart rates at or above 140 beats min-1 was 6(3)% in boys and 5(3)% in girls. Corresponding values for percentage time at or above 160 beats min-1 were 3(2) for boys and 2(1) for girls. The number of 10- and 20-min periods of activity with the heart rate sustained above the 140 and 160 beats min-1 thresholds were also totalled over the 3 days. No significant relationships were identified between percentage peak VO2 at the 2.5 or 4.0 mmol l-1 blood lactate reference levels and either percentage time or number of 10- or 20-min periods above 140 or 160 beats min-1 (P > 0.05). These results support the hypothesis that daily physical activity levels in 11-16-year-old children do not stress aerobic metabolism sufficiently to influence aerobic fitness.
Acromioclavicular disruption in first class rugby players.
Authors: Webb J , Bannister G
Published: December 2008

In a random sample of 105 first class rugby players, 45% gave a history of injury of the acromioclavicular joint. All continued to play at the highest level. The effects of the injury appeared to be minimal. Supraspinatus impingement syndrome commonly associated with acromioclavicular pathology was sought, but not found.
A modified repair for the anterior cruciate ligament deficient knee.
Authors: Holland J P
Published: December 2008

A retrospective analysis of 48 sportsmen and women from an original series of 76 consecutive patients who had undergone a modified McIntosh repair was carried out to establish whether or not the procedure could provide a satisfactory recovery and return to previous ability. The type and level of sport before injury was compared with that after operation. Symptoms of pain and giving way, and examination findings of pivot shift, and Lachman's test were compared before and after operation. Of the 48 patients assessed, 28 (58%) returned to full sporting capacity; 17 (35%) patients were participating in different sports or lower levels of their previous sports, and three patients did not participate in any sport. The more severely symptomatic knees did not perform so well after operation. The degree of preoperative anterior draw and Lachman's test did not influence the final result and the pivot shift, present in all before operation, was abolished in all but one case, which remained badly symptomatic. Concurrent meniscal injury or medial or lateral laxity did not influence return to sport once a full postoperative recovery was made. No deterioration was noticed in the level of sporting ability achieved thereafter. In this study it has been shown that the modified McIntosh repair is a swift extra-articular reconstruction for the anterior cruciate ligament deficient knee, which is less elaborate than previously described Ellison and McIntosh procedures, and which has produced a comparable result.
Physiological profiles of Hong Kong élite soccer players.
Authors: Chin M K , Lo Y S , Li C T , So C H
Published: December 2008

Most physiological profiles of élite soccer players originate from Western Europe and North America. Unfortunately, there is a scarcity of descriptive data on the physical characteristics of Asian soccer players. Therefore, the purpose of this study was to evaluate the physiological profiles of élite soccer players in Hong Kong. It was conducted in conjunction with the selection of the Hong Kong team before the 1990 Beijing Asian Games. In all, 24 professional soccer players were selected from a pool of 180 players as subjects for the study. The following means(s.d.) were observed: height 173.4(4.6) cm; weight 67.7(5.0) kg; body fat 7.3(3.0)%; forced vital capacity (FVC) 5.1(0.6) l; maximum oxygen uptake (VO2max) 59.1(4.9) ml kg-1 min-1; anaerobic threshold (AT 80.0(7.2)% of VO2max; alactic power index 13.5(2.4) W kg-1; lactic work index 298(27) J kg-1; peak isokinetic dominant knee extensor and flexor strengths 2.72(0.36) Nm kg-1 and 1.65(0.20) Nm kg-1. On average the physique of Hong Kong soccer players appeared to be smaller and lighter than those found in Europe, which may be one of the key factors that contribute to the lack of success of Hong Kong soccer teams in international competition.
Effect of caffeine on maximal strength and power in élite male athletes.
Authors: Jacobson B H , Weber M D , Claypool L , Hunt L E
Published: December 2008

Computerized testing of 20 élite male athletes was performed to determine the effect of 7 mg kg-1 caffeine on strength and power of the knee extensors and flexors. Subjects received counterbalanced administrations of either caffeine or a placebo on two separate occasions. Peak torque (T) was measured for knee extension (ET) and flexion (FT) at angular velocities of 30 degrees, 150 degrees and 300 degrees s-1. Additionally, performance for the first 125 ms (TAE) and power (W) were recorded during 300 degrees s-1. Testing sessions were held 1 week apart, at which time the placebo/caffeine administration was reversed. A 2 x 2 repeated measures analysis of variance supplemented with a Neuman-Keuls post hoc test showed the following--significant caffeine-related increases (P < 0.05) for ET at 30 degrees s-1, ET at 300 degrees s-1, and ETAE, and EW at 300 degrees s-1. Dependent t-tests performed for pre- to post-test means showed significant changes for the caffeine group in ET at 30 degrees s-1, FT at 30 degrees s-1, FT at 150 degrees s-1, ET at 300 degrees s-1, FT at 300 degrees s-1, E and FTAE, and EW at 300 degrees s-1. No significant effects were found for the placebo trial in any variable. It was concluded that caffeine can favourably affect some strength parameters in highly resistance-trained males. However, differences in subject fibre type, motivation and caffeine sensitivity need to be elucidated.
Overuse injury and growing bones: the young athlete at risk.
Authors: Gerrard D F
Published: December 2008

Increasing numbers of children are becoming involved in competitive sport. International trends in pre-adolescent sports participation are mirrored in New Zealand, where promising young athletes are being exposed to high-intensity training from an earlier age. As a consequence, overuse injuries which were traditionally described in more mature athletes are now becoming recognized in pre-adolescents. The immature musculoskeletal system is less able to cope with repetitive biomechanical stress. Sites of overuse injury reflect the sites of rapid musculoskeletal development. It therefore behoves all medical practitioners, but particularly those in primary care, to be aware of the young athlete at risk. Inherent in the presentation of such musculoskeletal insult there often lurks an over-enthusiastic parent. We are all well reminded of the covert pressures adults may bring to bear upon children. Psychological, as well as physical injury often results.
Abdominal muscle training in sport.
Authors: Norris C M
Published: December 2008

This paper evaluates several abdominal exercises, and highlights factors which are important for their safe prescription and effective use. The function of the abdominal muscles and hip flexors is considered, and the importance of the infra-umbilical portion of the rectus abdominis is emphasized. The effects of flexion on the lumbar spine are outlined. The trunk curl, sit-up, and straight leg raise are analysed, together with modifications of these exercises. The effect of foot fixation and hip flexion during the performance of the sit-up is discussed. The sit-up performed with foot fixation, and the bilateral straight leg raise can compound hip muscle imbalance, and both hyperextend and hyperflex the lumbar spine and are therefore not recommended. The importance of muscular control of pelvic tilt is considered with reference to muscle imbalance around the pelvis. It is recommended that a musculoskeletal assessment should be performed before prescribing abdominal exercises. Exercise therapy to re-educate control of pelvic tilt is described. Intra-abdominal pressure, and the effects of abdominal exercise on this mechanism, and lumbar stabilization are examined. The importance of training specificity is stressed.
The Johnson antishear device and standard shin pad in the isokinetic assessment of the knee.
Authors: Li C K , Chan K M , Hsu S Y , Chien P , Wong M W , Yuan Y
Published: December 2008

Isokinetic training and assessment of the knee joint has been the mainstay of rehabilitation, especially in patients with anterior cruciate ligament deficiency. Besides the original shin pad used, the antishear device was introduced by Johnson in 1982. This device has been shown biomechanically to prevent excessive anterior translation of force on the tibia during training. However, there is a need to compare the antishear device and the standard shin pad in the isokinetic assessment. Hence, the major objective of this study is to define, if any, the difference in patient assessment between the new double pad device and the old single shin pad. Ten subjects with no previous history of injury on either knee were tested with the Cybex Isokinetic Dynamometer. There were four men and six women and the mean age was 25.2 years. They were randomized into different test sequences with different shin pads at different speeds. Correlation and paired t tests (P) were performed to find out the correlation and difference between the two devices. There was significant difference in performance assessment between the two devices in knee extension (P < 0.05) but no significant difference in knee flexion (P > 0.05). There was also a high correlation (r > 0.75) between the two devices. It is concluded that because of the significant difference of data generated between the two devices, it is important to select one single device with each patient during a series of testings.