bluuebunny/crossref_metadata_2025_split huggingface dataset:
Acute Care for Exercise-Induced Hyperthermia to Avoid Adverse Outcome from Exertional Heat Stroke
Authors: Marom Tal , Itskoviz David , Lavon Haim , Ostfeld Ishay 
Published: August 2016

Introduction:Exertional heat stroke (EHS) is a major concern in military trainees performing intense physical exercise, with substantial morbidity rates. Prehospital diagnosis of EHS is essentially clinical. Thus, soldiers, command personnel, and medical staff are taught to recognize this injury and immediately begin aggressive treatment to prevent further deterioration.Patients and Methods:During 2007, 5 otherwise healthy Israeli Defense Forces (IDF) soldiers were diagnosed with EHS while performing strenuous exercise. They were treated vigorously according to the IDF EHS-treatment protocol and were referred to the emergency department.Results:On arrival at the emergency department, physical examination including rectal temperature was unremarkable in all soldiers. Blood and urine workup showed near-normal values. No other medical conditions that could have explained the clinical presentation were found. All soldiers were discharged shortly afterward, with no further consequences. A heat-tolerance test was performed several weeks after the event and was interpreted as normal. All soldiers returned to active service.Conclusion:Because the initial clinical findings were very suggestive of EHS and because no other condition could have explained the prehospital transient hyperthermia, we suggest that these soldiers were correctly diagnosed with EHS, and we propose that rapid vigorous cooling prevented further deterioration and complications. We suggest calling this condition aborted heat stroke.
Comparison of the Effects of Ice and 3.5% Menthol Gel on Blood Flow and Muscle Strength of the Lower Arm
Authors: Topp Robert , Winchester Lee , Mink Amber M. , Kaufman Jeremiah S. , Jacks Dean E. 
Published: August 2016

Context:Soft-tissue injuries are commonly treated with ice or menthol gels. Few studies have compared the effects of these treatments on blood flow and muscle strength.Objective:To compare blood flow and muscle strength in the forearm after an application of ice or menthol gel or no treatment.Design:Repeated-measures design in which blood-flow and muscle-strength data were collected from subjects under 3 treatment conditions.Setting:Exercise physiology laboratory.Participants:17 healthy adults with no impediment to the blood flow or strength in their right arm, recruited through word of mouth.Intervention:Three separate treatment conditions were randomly applied topically to the right forearm: no treatment, 0.5 kg of ice, or 3.5 mL of 3.5% menthol gel. To avoid injury ice was only applied for 20 min.Main Outcome Measures:At each data-collection session blood flow (mL/min) of the right radial artery was determined at baseline before any treatment and then at 5, 10, 15, and 20 min after treatment using Doppler ultrasound. Muscle strength was assessed as maximum isokinetic flexion and extension of the wrist at 30°/s 20, 25, and 30 min after treatment.Results:The menthol gel reduced (−42%, P < .05) blood flow in the radial artery 5 min after application but not at 10, 15, or 20 min after application. Ice reduced (−48%, P < .05) blood flow in the radial artery only after 20 min of application. After 15 min of the control condition blood flow increased (83%, P < .05) from baseline measures. After the removal of ice, wrist-extension strength did not increase per repeated strength assessment as it did during the control condition (9−11%, P < .05) and menthol-gel intervention (8%, P < .05).Conclusions:Menthol has a fast-acting, short-lived effect of reducing blood flow. Ice reduces blood flow after a prolonged duration. Muscle strength appears to be inhibited after ice application.
Reliability of Force-Platform Measures of Postural Sway and Expertise-Related Differences
Authors: Meshkati Zohreh , Namazizadeh Mehdi , Salavati Mahyar , Mazaheri Masood 
Published: August 2016

Context:Although reliability is a population-specific property, few studies have investigated the measurement error associated with force-platform parameters in athletic populations.Objective:To investigate the skill-related differences between athletes and nonathletes in reliability of center-of-pressure (COP) summary measures under eyes-open (EO) and eyes-closed (EC) conditions.Design:Test–retest reliability study.Setting:COP was recorded during double-leg quiet standing on a Kistler force platform before and after a fatiguing treadmill exercise, with EO and EC.Participants:31 male participants including 15 athletes practiced in karate and 16 nonathletes.Main Outcome Measures:Standard deviation (SD) of amplitude, phase-plane portrait, SD of velocity, mean total velocity, and area were calculated from 30-s COP data. Intraclass correlation coefficient (ICC), standard error of measurement, and coefficient of variation (CV) were used as estimates of reliability and precision.Results:Higher ICCs were found for COP measures in the athlete (compared with the nonathlete) group, postfatigued (compared with prefatigued) condition, and EC (compared with EO) tests. CVs smaller than 15% were obtained for most of the COP measures. SD of velocity in the anteroposterior direction showed the highest reliability in most conditions.Conclusions:Tests with EC and to a lesser extent tests performed in the athlete group and in the postfatigued condition showed better reliability.
Effects of Exercise on Lower Extremity Muscle Function After Anterior Cruciate Ligament Reconstruction
Authors: Kuenze Christopher , Hertel Jay , Hart Joseph M. 
Published: August 2016

Purpose:Persistent quadriceps weakness due to arthrogenic muscle inhibition (AMI) has been reported after anterior cruciate ligament (ACL) reconstruction. Fatiguing exercise has been shown to alter lower extremity muscle function and gait mechanics, which may be related to injury risk. The effects of exercise on lower extremity function in the presence of AMI are not currently understood. The purpose of this study was to compare the effect of 30 min of exercise on quadriceps muscle function and soleus motoneuron-pool excitability in ACL-reconstructed participants and healthy controls.Methods:Twenty-six (13 women, 13 men) healthy and 26 (13 women, 13 men) ACL-reconstructed recreationally active volunteers were recruited for a case-control laboratory study. All participants completed 30 min of continuous exercise including alternating cycles of inclined-treadmill walking and bouts of squats and step-ups. Knee-extension torque, quadriceps central activation ratio (CAR), soleus H:M ratio, and soleus V:M ratio were measured before and after 30 min of exercise.Results:There was a significant group × time interaction for knee-extension torque (P = .002), quadriceps CAR (P = .03), and soleus V:M ratio (P = .03). The effect of exercise was smaller for the ACL-R group than for matched controls for knee-extension torque (ACL-R: %Δ = −4.2 [−8.7, 0.3]; healthy: %Δ = −14.2 [−18.2, −10.2]), quadriceps CAR (ACL-R: %Δ = −5.1 [−8.0, −2.1]; healthy: %Δ = −10.0 [−13.3, −6.7]), and soleus V:M ratio (ACL-R: %Δ = 37.6 [2.1, 73.0]; healthy: %Δ = −24.9 [−38.6, −11.3]).Conclusion:Declines in quadriceps and soleus volitional muscle function were of lower magnitude in ACL-R subjects than in healthy matched controls. This response suggests an adaptation experienced by patients with quadriceps AMI that may act to maintain lower extremity function during prolonged exercise.
Increased Active Hamstring Stiffness After Exercise in Women With a History of Low Back Pain
Authors: Bedard Rebecca J. , Kim Kyung-Min , Grindstaff Terry L. , Hart Joseph M. 
Published: August 2016

Objective:To compare active hamstring stiffness in female subjects with and without a history of low back pain (LBP) after a standardized 20-min aerobic-exercise session.Design:Case control.Setting:Laboratory.Participants:12 women with a history of recurrent episodes of LBP (age = 22.4 ± 2.1 y, mass = 67.1 ± 11.8 kg, height = 167.9 ± 8 cm) and 12 matched healthy women (age = 21.7 ± 1.7 y, mass = 61.4 ± 8.8 kg, height = 165.6 ± 7.3 cm). LBP subjects reported an average 6.5 ± 4.7 on the Oswestry Disability Index.Interventions:Participants walked at a self-selected speed (minimum 3.0 miles/h) for 20 min. The treadmill incline was raised 1% grade per minute for the first 15 min. During the last 5 min, participants adjusted the incline of the treadmill so they would maintain a moderate level of perceived exertion through the end of the exercise protocol.Main Outcome Measures:During session 1, active hamstring stiffness, hamstring and quadriceps isometric strength, and concurrently collected electromyographic activity were recorded before and immediately after the exercise protocol. For session 2, subjects returned 48–72 h after exercise for repeat measure of active hamstring stiffness.Results:Hamstring active stiffness (Nm/rad) taken immediately postexercise was not significantly different between groups. However, individuals with a history of recurrent LBP episodes presented significantly increased hamstring stiffness 48–72 h postexercise compared with controls. For other outcomes, there was no group difference.Conclusions:Women with a history of recurrent LBP episodes presented greater active hamstring stiffness 48–72 h after aerobic exercise.
Fatigue’s Lack of Effect on Thigh-Muscle Activity in Anterior Cruciate Ligament–Reconstructed Patients During a Dynamic-Landing Task
Authors: Lepley Lindsey K. , Thomas Abbey C. , McLean Scott G. , Palmieri-Smith Riann M. 
Published: August 2016

Context:As individuals returning to activity after anterior cruciate ligament reconstruction (ACLr) likely experience fatigue, understanding how fatigue affects knee-muscle activation patterns during sport-like maneuvers is of clinical importance. Fatigue has been suggested to impair neuromuscular control strategies. As a result, fatigue may place ACLr patients at increased risk of developing posttraumatic osteoarthritis (OA).Objective:To determine the effects of fatigue on knee-muscle activity post-ACLr.Design:Case control.Setting:University laboratory.Participants:12 individuals 7–10 mo post-ACLr (7 male, 5 female; age 22.1 ± 4.7 y; 1.8 ± 0.1 m; mass 77.7 ± 11.9 kg) and 13 controls (4 male, 9 female; age 22.9 ± 4.3 y; 1.7 ± 0.1 m; mass 66.9 ± 9.8 kg).Interventions:Fatigue was induced via repetitive sets of double-leg squats (n = 8), which were interspersed with sets of single-leg landings (n = 3), until squats were no longer possible.Main Outcome Measures:2 × 2 repeated-measures ANOVA was used to detect the main effects of group (ACLr, control) and fatigue state (prefatigue, postfatigue) on quadriceps:hamstring cocontraction index (Q:H CCI).Results:All subjects demonstrated higher Q:H CCI at prefatigue compared with postfatigue (F1,23 = 66.949, P ≤ .001). Q:H CCI did not differ between groups (F1,23 = 0.599, P = .447).Conclusions:The results indicate that regardless of fatigue state, ACLr individuals are capable of restoring muscle-activation patterns similar to those in healthy subjects. As a result, excessive muscle cocontraction, which has been hypothesized as a potential mechanism of posttraumatic OA, may not contribute to joint degeneration after ACLr.
Modulation of Frontal-Plane Knee Kinematics by Hip-Extensor Strength and Gluteus Maximus Recruitment During a Jump-Landing Task in Healthy Women
Authors: Hollman John H. , Hohl Jeffrey M. , Kraft Jordan L. , Strauss Jeffrey D. , Traver Katie J. 
Published: August 2016

Context:Abnormal lower extremity kinematics during dynamic activities may be influenced by impaired gluteus maximus function.Objective:To examine whether hip-extensor strength and gluteus maximus recruitment are associated with dynamic frontal-plane knee motion during a jump-landing task.Design:Exploratory study.Setting:Biomechanics laboratory.Participants:40 healthy female volunteers.Main Outcome Measures:Isometric hip-extension strength was measured bilaterally with a handheld dynamometer. Three-dimensional hip and knee kinematics and gluteus maximus electromyography data were collected bilaterally during a jumplanding test. Data were analyzed with hierarchical linear regression and partial correlation coefficients (α = .05).Results:Hip motion in the transverse plane was highly correlated with knee motion in the frontal plane (partial r = .724). After controlling for hip motion, reduced magnitudes of isometric hip-extensor strength (partial r = .470) and peak gluteus maximus recruitment (partial r = .277) were correlated with increased magnitudes of knee valgus during the jump-landing task.Conclusion:Hip-extensor strength and gluteus maximus recruitment, which represents a measure of the muscle’s neuromuscular control, are both associated with frontal-plane knee motions during a dynamic weight-bearing task.
The Effect of Pelvic Position on Popliteal Angle Achieved During 90:90 Hamstring-Length Test
Authors: Herrington Lee 
Published: August 2016

Context:Hamstring muscle length is commonly measured because of its perceived relationship to injury of both the hamstrings themselves and the pelvis and lumbar spine. The popliteal (knee-extension) angle measured from the starting position hip and knee at 90° is a commonly used indirect measure of hamstring muscle length. When this measure has been undertaken in the literature previously, little attention was paid to the position of the pelvis, which may significantly influence measurements taken.Design:Repeated-measures.Setting:University human performance laboratory.Participants:60 healthy physically active males (mean age 20.1 ± 1.8 y, range 18–24 y).Intervention:The 2 extremes of pelvic position (anterior and posterior).Main Outcome Measure:Popliteal angle (with maximal knee extension) was measured in 2 positions, 1 of full anterior and 1 of full posterior pelvic tilt.Results:The mean difference in popliteal angle between anterior to posterior pelvic positions was 13.4° ± 9° (range 0–26°); this was statistically significant (P = .0001).Conclusion:The findings of the study indicate that pelvic position has a significant effect on popliteal angle and therefore should be taken into account when measuring hamstring muscle length.
Talofibular Interval Changes After Acute Ankle Sprain: A Stress Ultrasonography Study of Ankle Laxity
Authors: Croy Theodore , Saliba Susan , Saliba Ethan , Anderson Mark W. , Hertel Jay 
Published: August 2016

Introduction:Quantifying talocrural joint laxity after ankle sprain is problematic. Stress ultrasonography (US) can image the lateral talocrural joint and allow the measurement of the talofibular interval, which may suggest injury to the anterior talofibular ligament (ATFL). The acute talofibular interval changes after lateral ankle sprain are unknown.Methods:Twenty-five participants (9 male, 16 female; age 21.8 ± 3.2 y, height 167.8 ± 34.1 cm, mass 72.7 ± 13.8 kg) with 27 acute, lateral ankle injuries underwent bilateral stress US imaging at baseline (<7 d) and on the affected ankle at 3 wk and 6 wk from injury in 3 ankle conditions: neutral, anterior drawer, and inversion. Talofibular interval (mm) was measured using imaging software and self-reported function (activities of daily living [ADL] and sports) by the Foot and Ankle Ability Measure (FAAM).Results:The talofibular interval increased with anterior-drawer stress in the involved ankle (22.65 ± 3.75 mm; P = .017) over the uninvolved ankle (19.45 ± 2.35 mm; limb × position F1,26 = 4.9, P = .035) at baseline. Inversion stress also resulted in greater interval changes (23.41 ± 2.81 mm) than in the uninvolved ankles (21.13 ± 2.08 mm). A main effect for time was observed for inversion (F2,52 = 4.3, P = .019, 21.93 ± 2.24 mm) but not for anterior drawer (F2,52 = 3.1, P = .055, 21.18 ± 2.34 mm). A significant reduction in the talofibular interval took place between baseline and week 3 inversion measurements only (F1,26 = 5.6, P = .026). FAAM-ADL and sports results increased significantly from baseline to wk 3 (21.9 ± 16.2, P < .0001 and 23.8 ± 16.9, P < .0001) and from wk 3 to wk 6 (2.5 ± 4.4, P = .009 and 10.5 ± 13.2, P = .001).Conclusions:Stress US methods identified increased talofibular interval changes suggestive of talocrural laxity and ATFL injury using anterior drawer and inversion stress that, despite significant improvements in self-reported function, only marginally improved during the 6 wk after ankle sprain. Stress US provides a safe, repeatable, and quantifiable method of measuring the talofibular interval and may augment manual stress examinations in acute ankle injuries.
The Effect of Physical Training in Children With Asthma on Pulmonary Function, Aerobic Capacity and Health-Related Quality of Life: A Systematic Review of Randomized Control Trials
Authors: Crosbie Alison 
Published: August 2016

ObjectiveAsthma is a leading cause of chronic illness in children, impacting heavily on their daily life and participation in physical activity. The purpose of this systematic review was to investigate the evidence for the use of physical therapy to improve pulmonary function and aerobic capacity in children with asthma. Furthermore, the review aims to update previous literature on the effect of exercise on health related quality of life.MethodsA search was conducted for randomized control trials (RCTs) using the electronic databases Medline, Embase, SPORTDiscus, AMED, CINAHL, and The Cochrane Central Register of Controlled Trials. Studies were included if the participants were asthmatic children aged 6–18 years participating in any mode of physical exercise. Studies were reviewed for study quality, participant details, exercise intervention details, and intervention outcomes.ResultsA total of 16 studies and 516 subjects met inclusion criteria for review. Severity of asthma ranged from mild to severe. No improvement in pulmonary function was observed. Physical training led to an increase in aerobic capacity as measured by VO2max (mL/kg/min).ConclusionsFindings suggest that physical training does not improve pulmonary function in children with asthma, but does increase aerobic capacity. The small number of studies investigating quality of life suggests that physical training does improve health related quality of life; however further well designed randomized control trials are needed to verify these findings.
A Phenomenological Investigation of Gymnasts’ Lived Experience of Imagery
Authors: Post Phillip G. , Wrisberg Craig A. 
Published: August 2016

The authors would like to extend their gratitude to the ten gymnasts participating in this study. Their willingness to share their time and experiences made this research project possible.Phenomenological interviews were conducted with ten female collegiate gymnasts (M age = 22.2; SD = 1.68 yr) to determine their lived experience of sport imagery. Qualitative analysis of the interview data revealed a total of 693 meaning units and produced a final thematic structure consisting of five major dimensions: preparing for movement; mentally preparing; feeling the skill; controlling perspective/speed/effort; and time and place. Among the results not reported in previous studies were athletes’ manipulations of imagery speed for various purposes, the incorporation of abbreviated body movements during imagery to accentuate the feel of the action, correcting inadvertent mistakes in an imaged performance, and the imaging of upcoming segments of a serial skill during execution. The findings extend previous sport imagery research and provide suggestions for sport psychology consultants working with elite gymnasts.
Morphological, Functional, and Fitness-Related Characteristics of Young Female Field Hockey Players
Authors: Fedotova Elena 
Published: August 2016

Morphological parameters (stature, weight, segment lengths, diameters, circumferences, body composition), functional characteristics (work capacity, respiratory performance, static strength of hand) and aspects of health- and skill-related fitness (explosive strength, speed, anaerobic and aerobic endurance, agility) of 141 well-trained young female field hockey players (10 to 18 y) were examined and analyzed. The main purpose of the investigation was to study growth trends of these parameters of female field hockey players and to analyze the character and feature of their development.Standard anthropometric measurements were used for evaluation of morphological characteristics. Matiegka’s equations were used for computation of body composition’s parameters. Modification of the Harvard step test was used for estimation of physical capacity. Respiratory performance was evaluated using vitalograph. Static strength of the hands was obtained using a handgrip. Characteristics of health- and skill-related fitness were evaluated using the following test battery: standing broad jump, 30 m dash run, flying 30 m test, 210 yards shuttle run, 2000 m run, push-ups and 20 m zig-zag run.Results of the study were as follows: the functional characteristics have the greatest total increase (about 108-144 %) during the age span considered (from 10 to 18 years). Stature and other length parameters increased about 18-20 %. The periods of the acceleration of increases in morphological parameters precede the periods of the sizable increases in functional parameters. Based upon the analysis of aspects of health- and skill-related fitness of players training and practicing in hockey has a beneficial effect on this group of characteristics. Based on the results of the study, the optimum periods for speed, strength and endurance training of female hockey players are exposed.
Development of Relationship to Sport: Sport Biographies of German Women
Authors: Pfister Gertrud 
Published: August 2016

In Germany there is a huge discrepancy between positive attitudes toward physical activity and actual practice of sport. According to representative studies more than 80% of the population is convinced that for various reasons, especially those of health, it is very important to take up a sport (Kaschuba, 1989). However, only 21% of the male and no more than 14% of the female population (older than 14) were reported to practice a sport at least once a week (Opaschowski, 1995).This article focuses on the question of how a relationship to sport develops in the course of the lives of girls and women. The empirical data derives from a project on “Sport in the Lives of Women” in which women active in football (soccer), gymnastics/aerobics and tennis were interviewed about their biographies and their experience with physical activities. The theoretical background is based on approaches towards life course and biography, gender and gender relations, and socialization. Typical patterns of sport involvement in the different stages of life, e.g. the important role of the parents in early childhood and the importance of peers at school were found.,.In addition, different types of sport commitment could be identified. Certain patterns, for example, were dependent on the combination of the simultaneous practice of different types of sport and the alternation between practice and non-practice of sport. In this way it was possible to distinguish between all-round sportswomen and women who practice sport for reasons of health. In general, sport biographies develop through the close interaction of social factors and individual decisions.