bluuebunny/crossref_metadata_2025 huggingface dataset:
The effects of a Melissa officinalis L. based product on metabolic parameters in patients with type 2 diabetes mellitus: A randomized double-blinded controlled clinical trial
Authors: Nayebi Neda , Esteghamati Alireza , Meysamie Alipasha , Khalili Nahid , Kamalinejad Mohammad , Emtiazy Majid , Hashempur Mohammad Hashem
Published: January 2019

Background

Diabetic patients are at increased risk for coronary artery disease. Since phytotherapy has been greatly common, finding safe and effective treatments is of importance. This study aimed to evaluate the effects of a Melissa officinalis L. based product (MO) in patients with type 2 diabetes.

Methods

A randomized double-blinded controlled study was conducted with 37 dyslipidemic diabetic patients, assigned to either MO or placebo (P) groups receiving two 500 mg capsules daily for 3 months. Finally, 32 cases completed the study and were included in the analysis; MO (n=16) and P (n=16).

Results

Safe and significant effects in terms of decreasing the serum level of triglyceride (TG) in all patients after 2 months (p-value=0.02) and in patients with higher baseline serum levels of TG (TG≥200 mg/dl) after 3 months (p-value=0.04) were shown in the MO group. However, no metabolic significant changes were seen compared to the control group. Significant decrease in both systolic and diastolic blood pressure from baseline values were also found in patients with higher systolic blood pressure (SBP≥130 mmHg) (p-value=0.02) and those with higher diastolic blood pressure (DBP≥85 mmHg) (p-value=0.02) in the MO group.

Conclusion

This study showed that MO might be safe and beneficial in decreasing the serum TG level in dyslipidemic diabetic patients. Although, larger long-term studies are required.
Spectrum of free-form Sudoku graphs
Authors: Abudayah Mohammad , Alomari Omar , Sander Torsten
Published: January 2019

A free-form Sudoku puzzle is a square arrangement ofm×mcells such that the cells are partitioned intomsubsets (called blocks) of equal cardinality. The goal of the puzzle is to place integers 1, . . ,min the cells such that the numbers in every row, column and block are distinct. Represent each cell by a vertex and add edges between two vertices exactly when the corresponding cells, according to the rules, must contain different numbers. This yields the associated free-form Sudoku graph. This article studies the eigenvalues of free-form Sudoku graphs, most notably integrality. Further, we analyze the evolution of eigenvalues and eigenspaces of such graphs when the associated puzzle is subjected to a ‘blow up’ operation, which scales the cell grid including its block partition.
Do Benefit Corporations Represent a Policy Threat to Nonprofits?
Authors: Toepler Stefan
Published: January 2019

In the US and increasingly internationally as well, considerable efforts have been made in recent years to introduce new legal forms, such as the benefit corporation, at the local level as an additional structural option for social entrepreneurs. These efforts have been met with considerable apprehension on the part of nonprofit sector advocates, who perceive these new organizational forms as potential competition. This paper investigates whether the benefit corporation is in fact a likely competitive threat to nonprofits. Presenting the findings of an early uptake study, it reviews the early experience with the state-level introduction of the benefit corporation in Maryland, the first state to adopt the new legal form.
Assessment of radioactivity from selected soil samples from Halfa Aljadida area, Sudan
Authors: Elzain Abd-Elmoniem A. , Idriss Hajo , Mohammed Yousif Sh. , Mohamed Khidir Shaib , Mohamed Ali Mohamed Abd Elwahab , Elkhalig Mohamed Musa Saad Hasb , Salih Isam , Khatir Sam Adam , Eisa Mohammed H. , Mahmoud Sumai S. , Massoud Makin K. , Os Osman Abdallah A. , Rabih Mohammed Nour A.
Published: January 2019

In this research, the results of radon concentration, surface and mass exhalation rates, radium concentration, effective dose rate and the alpha index have been investigated in a number of 198 soil samples that have been collected from various residential locations of Halfa Aljadida area, Sudan. The can technique, containing CR-39 have been used. From our results, the average value of soil gas radon concentration was found to be 1.96±0.22 kBq·m−3. The average values of surface and mass exhalation rates were 1.73±0.19 Bq·m−2·h−1 and 34.79±3.87 mBq·kg−1·h−1, respectively. The radium concentration average value was 8.06±0.90 Bq·kg−1. While the average value of the effective dose rate was recorded to be 54.69±6.11 mSv·y−1. The average value of alpha index of studied samples was (4.03±0.45)×10−2. From the study, a good positive and linear correlation between radium concentration, surface and mass exhalation rates of soil samples were present. In addition to that, a positive and linear correlation between radium and radon concentrations was found. Finally, a comparison between the results and other findings was conducted and the results imply the fact that the area under consideration is safe as if the health hazard are mentioned.
Using semantic tagging to examine the American Dream and the Chinese Dream
Authors: Hou Zhide
Published: January 2019

This paper uses Wmatrix to generate semantic tagging to compare corpora of media representations between the American Dream and the Chinese Dream. The USAS tagger is used to assign the semantic field tags to the America Dream Corpus (ADC) and the Chinese Dream Corpus (CDC). The motivation of this study is to replicate the studies using an automated and inclusive method based on semantic tagging (Potts, A. & P. Baker. 2012. Does semantic tagging identify cultural change in British and American English?International Journal of Corpus Linguistics17(3). 295–324), and more importantly, to conduct a broad semantic categorization on both national dreams so as to uncover the cultural, social and historical similarities and/or differences. It is found that the cultural difference of the individualistic home and work association of the American Dream versus the collectivistic nation and world attributions of the Chinese Dream. The different historical stage and social-economic contexts are disclosed from the different temporal positions from time category, and the contrastive tags associated with negative representation of the American Dream and positive representation of the Chinese Dream.
Faith in fakes: Secrets, lies, and conspiracies in Umberto Eco’s writings
Authors: Rodríguez-Ferrándiz Raúl
Published: January 2019

This paper offers a re-reading of the works of Umberto Eco, be they academic, journalistic or literary, with apseudologictone: his desire to investigate the mechanisms of lying, and their relation with fiction, falsification, error, secrecy, and conspiracy. The study will review some of his main academic texts in the fields of semiotics, rhetoric, and aesthetics, and will make some references to his recent novels and essay compilations, as well as offer an explanation of how the evolution of his thoughts takes a pessimistic turn. The face of the lie, which initially was aesthetic consolation and consumerist delusion, and then a game of intelligence, a creative stimulus and an interpretive challenge, changes when serves the purpose of extortion, manipulation, and war. In short, it could be argued that Eco became increasingly disappointed by deceptions, and lost faith in fakes and forgeries.
Language mediated mentalization: A proposed model
Authors: Neuman Yair
Published: January 2019

Mentalization describes the process through which we understand the mental states of oneself and others. In this paper, I present a computational semiotic model of mentalization and illustrate it through a worked-out example. The model draws on classical semiotic ideas, such as abductive inference and hypostatic abstraction, but pours them into new ideas and tools from natural language processing, machine learning, and neural networks, to form a novel model of language-mediated-mentalization.
Evaluation of plasma VEGF and sVEGFR-1 levels in patients with diabetes mellitus receiving insulin treatment
Authors: Erturk Ismail , Sertoglu Erdim , Yesildal Fatih , Acar Ramazan , Saglam Kenan , Ozgurtas Taner
Published: January 2019

Background

Diabetes mellitus (DM) is a multifactorial chronic disease, in which patients need to be treated with insulin in some conditions. Capillary growth is regulated by growth factors like vascular endothelial growth factor (VEGF) and endogenous inhibitors such as the splice variant of VEGF receptor-1 (sVEGFR-1). We aimed to show the levels and the clinical significance of VEGF, sVEGFR-1 in patients with DM on insulin treatment.

Materials and methods

A total of 83 subjects consisting of patients with the diagnosis of DM (n=47) and healthy control (n=36) were included the study. Plasma levels of VEGF and sVEGFR-1, were measured using the enzyme-linked immunosorbent assay method.

Results

The average sVEGFR-1 levels of DM group was significantly higher than the control group (0.106±0.052 and 0.073±0.049, respectively; p=0.005). Significantly lower sVEGFR-1 levels were determined in patients receiving metformin vs. without metformin using (0.065±0.016 and 0.118±0.053, respectively; p=0.001).

Conclusion

This is the first study evaluating and demonstrating the importance of plasma VEGF and sVEGFR-1 levels together in DM patients receiving insulin. Using metformin may have positive effect on angiogenesis in DM. Further studies are required to understand these effects.
Accidental intravenous bolus infusion of potassium chloride in a young man with hypokalemic periodic paralysis
Authors: Rahmani Seyed Hesam , Faridaalaee Gholamreza
Published: January 2019

Hypokalemic periodic paralysis is anautosomal dominantdisease characterized by muscle weakness or paralysis with a matching fall in blood potassium levels. Paralysis attacks often occur in adolescence and are induced by strenuous exercise followed by rest, high carbohydrateor high sodiummeal content, sudden changes in temperature, and even excitement, noise, flashing lights and cold temperatures. Despite global daily use of intravenous and oral potassium in the treatment of patients, data about intravenous bolus potassium is rare. Here we report a 29-year-old man complaining of weakness in the upper and lower limbs. By initial diagnosis of periodic hypokalemic paralysis, potassium chloride was ordered by oral route. After a few minutes, we heard patient screaming in pain. He complained of severe acute pain in peripheral intravenous line, palpitation and dyspnea. We noticed that potassium chloride vial was infused directly via cubital vein in few minutes erroneously. Physical exam revealed sinus tachycardia and hypertension. We began hyperkalemia treatment immediately. With appropriate treatment,the patient was discharged with good condition after 12 hours of admission.
Health systems research initiative to tackle growing road traffic injuries in India
Authors: Babu Bontha V , Sharma Yogita
Published: January 2019

Road traffic injuries (RTIs) are the sixth leading cause of deaths in India and about 400 deaths take place every day due to road traffic accidents. The present paper analyses the data of the India’s National Crime Record Bureau (NCRB) to assess the burden of RTI. In addition, it reports the health systems research initiated by the Indian Council of Medical Research (ICMR). As per NCRB data, in 2015, 6.3 million persons (50 persons per 10 million population) injured and out of them 1.4 million (11 persons per 10 million population) died in India. Except the NCRB data, there are no nation-wide data on RTI and the data remain poorly collected and sporadic in India. Hence, ICMR has initiated a multi-centric study to establish an electronic-based comprehensive and integrated RTI surveillance system. The second issue on which ICMR undertake research is timely and quality care of RTI patients as many deaths occur either at the scene or en route to the hospital. There is a clear survival and functional benefit for critically injured patients to receive appropriate care within the first 60 minutes of injury (‘golden hour’). Hence, this multicentric study has been initiated to standardize structured evidence-based intervention for safety, efficacy and quality of post-crash pre-hospital and in-hospital trauma care services to improve the outcome in RTI victims. An android-based trauma registry is being built and will be used to assess the impact of interventions. These studies will provide first comprehensive estimates on various epidemiological issues related to RTI. Also, an evidence of improvement through quality post-crash prehospital and in-hospital trauma care services will emerge. These results will contribute to the setting of research and investment priorities and to formulate policies and guidelines.
Comparing the early function and complications between fluoroscopic guidance and blindly insertion of permanent hemodialysis catheter
Authors: Malekpour Alamdari Nasser , Shams Vahdati Samad , Gholizadeh Barmak , Nayebian Shima
Published: January 2019

Objective: Chronic kidney disease (CKD) is a complicated kidney defect causing permanent failure in renal function in progressive stages. Hemodialysis is the most accepted treatment to maintain body’s fluid/electrolyte homeostasis at the terminal stages of the disease. Permanent hemodialysis catheter (permicath) may be inserted blindly or by fluoroscopic guidance. This study aimed to compare the early function and complications between fluoroscopic guidance and blindly insertion of permanent hemodialysis catheter. Methods: This prospective randomized clinical trial was undertaken in the emergency department of Modarres hospital in Tehran, Iran during 2014 and 2015. Patients who needed catheter due to renal failure entered the study. Patients who needed emergency dialysis and those who could not wait for permicath were excluded. Patients were randomly assigned into 2 groups, under fluoroscopic guidance and blindly catheter insertion. Data were collected using a questionnaire and a checklist related to function (after 24 hours and 1 month), a need to exchange the catheter and the early adverse effects such as pneumothorax, hemothorax, and vascular injury. Results: A total of 101 patients were enrolled in this trial. Early dysfunction (blind group= 5), a need for catheter exchange (blind group= 2), pneumothorax (blind group=2), vascular injury (blind group=1) were recorded but the difference between the two groups was not statistically significant (P>0.05). Conclusion: We did not observe a significant difference between the placement of permicath by fluoroscopic or blind method. However, more studies with larger groups are recommended.
Pattern and risk factors of acute poisoning in a tertiary hospital of Central Bangladesh
Authors: Rafiqul Islam Mohammad , Biswas Sarmistha , Hossain Syed Zakir , Islam Nafizul , Dewan Gourab , Amin Mohammad Robed
Published: January 2019

Objective: Acute poisoning is a common cause of hospital admission in Bangladesh. But, risk factors and characteristics of victims of different modes of poisoning have not been evaluated for possible intervention strategies. So, in this study we aimed to describe the pattern of acute poisoning in central Bangladesh as well as identifying risk factors for various mode of poisoning. Methods: A prospective observational study was undertaken in Dhaka Medical College Hospital in 2015. Consenting adult acute poisoning victims were included as study subjects. A pretested structured case record form was used to systematically record the cases. The poisoning cases were defined by clinical toxidrome (sympathomimetic, antimuscarinic, opioids, cholinergic, sedative, etc) during acute presentation with suspected poisoning and groups accordingly. SPSS 20 was used for data analysis and statistical tests including mean ± standard division (SD), percentage, t test and chi-square were used accordingly. Results: Total poisoning cases were 1155. Suicidal (62.25%, n=719), commuter poisoning (24.16%, n=279) and accidental poisoning (12.38%, n=143) were main types of poisoning. Risk factors of suicidal poisoning were young females of 11 to 30 years, married, housewives and students (P<0.0001). Stressful relationship was the commonest reason of suicidal poisoning. Pesticides and sedatives were frequently chosen for easy availability. Commuter poisoning was common in males and urban areas (P<0.0001). Accidental poisoning was more in males and rural areas (P<0.0001) and snake envenomation was the main cause. Conclusion: Poisoning burden is high in central Bangladesh. Identified risk factors will help develop poisoning prevention strategies.
Cardiovascular complications and acute ischemic stroke after the treatment with epinephrine in an anaphylactic patient
Authors: Köse Ataman , Yarkaç Akif , Bozali Gülten , Babuş Seyran Bozkurt , Altınsoy Ersin
Published: January 2019

Anaphylaxis is a serious clinical condition that can affect all ages and many systems (skin, gastrointestinal system, respiratory and cardiovascular systems). There are a few case reports of cardiac and cerebrovascular complications due to the anaphylaxis and/or the treatment with epinephrine. A 69-year-old female patient with known coronary artery disease (CAD), coronary artery bypass graft (CABG), and diabetes mellitus (DM) was admitted to the emergency department. She was brought to the emergency service with the complaints of shortness of breath, swelling of the tongue and lip, widespread itching and nausea after the use of amoxicillin-clavulonic acid due to soft tissue infection. The patient was considered as having anaphylaxis. 0.5 mg intramuscular (IM) epinephrine was administered. Following the emergency electrocardiography (ECG), the rate was 140/min and the rhythm was evaluated as atrial fibrillation. We present a case of cardiovascular complications and acute ischemia stroke following intramuscular epinephrine administration with anaphylactic diagnosis in this study. As a result, anaphylaxis management is extremely important in elderly patients with preexisting cardiovascular conditions.
Repeated Incremental Workbouts Separated by 1 Hour Increase the Electromyographic Fatigue Threshold
Authors: Bremer Nate , Peoples Gavin , Hasler Brent , Litzenburg Robert , Johnson Andrew , Malek Moh H.
Published: January 2019

Bremer, N, Peoples, G, Hasler, B, Litzenburg, R, Johnson, A, and Malek, MH. Repeated incremental workbouts separated by 1 hour increase the electromyographic fatigue threshold. J Strength Cond Res 35(5): 1397–1402, 2021—Studies examining the influence of priming, for continuous exercise, have mainly focused on improved exercise capacity related to oxygen uptake kinetics rather than on neuromuscular fatigue of the muscle. The purpose of this study, therefore, was to determine whether or not the electromyographic fatigue threshold (EMGFT) could be modulated by having subjects perform 2 incremental tests separated by 1 hour. We hypothesized that the EMGFT determined from the second incremental test would be higher than the EMGFT determined from the first incremental test. Nine healthy college-aged men (mean ± SEM: age: 23.8 ± 0.6 years; body mass: 79.5 ± 3.3 kg; height: 1.78 ± 0.02 m) were recruited from the university population. Each subject visited the laboratory on 1 occasion and performed 2 incremental single-leg knee-extensor ergometry to voluntary fatigue separated by 1 hour. The EMGFT was determined for each trial and statistically compared using paired-samples t-test. The results indicated significant mean differences between the EMGFT for the 2 trials (trial 1: 27 ± 1 W vs. trial 2: 34 ± 2 W; p = 0.001), whereas there were no significant mean differences for maximal power output (trial 1: 53 ± 2 W vs. trial 2: 57 ± 2; p = 0.09). These findings suggest that postactivation potentiation may, in part, explain the differences in EMGFT because the exercise mode used in the current study minimizes the cardiorespiratory responses to exercise.
Effects of Combined Surfaces vs. Single-Surface Plyometric Training on Soccer Players' Physical Fitness
Authors: Ramirez-Campillo Rodrigo , Álvarez Cristian , García-Pinillos Felipe , García-Ramos Amador , Loturco Irineu , Chaabene Helmi , Granacher Urs
Published: January 2019

Ramirez-Campillo, R, Álvarez, C, García-Pinillos, F, García-Ramos, A, Loturco, I, Chaabene, H, and Granacher, U. Effects of combined surfaces vs. single-surface plyometric training on soccer players' physical fitness. J Strength Cond Res 34(9): 2644–2653, 2020—The aim of this study was to compare the effects of a 8-week plyometric jump training (PJT) performed on different surfaces (grass, land-dirt, sand, wood, gym mat, and tartan-track) vs. a single-surface PJT (grass) on components of physical fitness (muscle power, speed, and change-of-direction speed [CODS] tasks) and sport-specific performance (i.e., maximal kicking velocity [MKV]) in male soccer players aged 11–14 years. Athletes were randomly assigned to a combined surfaces PJT (PJTc, n = 8), a single-surface PJT (PJTs, n = 8), or an active control (CON, n = 7). Although the PJT group trained on grass, the PJTc trained on 6 different surfaces and equally distributed the total jump volume according to the surface. Pre-post tests were conducted on grass. Significant main effects of time were observed for the countermovement jump, the standing-long-jump, the 20-cm drop jump, 30-m sprint time, CODS, and MKV (all p < 0.001; d = 0.53–0.87). Group × time interactions were identified for all jump tests, MKV, 30-m sprint time, and CODS (all p < 0.001; d = 0.58–0.71) in favor of PJTc. No significant pre-post changes were observed in the CON (all p > 0.05; d = 0.07–0.1). In conclusion, PJT is effective in improving physical fitness in young soccer players when conducted in combination with regular soccer training. Although general fitness testing and PJTs were performed on grass, larger physical fitness improvements were found after PJTc. Thus, PJTc is recommended, as it provides a better overload stimulus compared with more conventional training overload (e.g., increase in training volume or intensity). Future studies still have to address the underlying physiological adaptations after PJTc.
Comparison of the Polar V800 and the Garmin Forerunner 230 to Predict V̇o 2max
Authors: Snyder Nikolas C. , Willoughby Courtney A. , Smith Bryan K.
Published: January 2019

Snyder, NC, Willoughby, CA, and Smith, BK. Comparison of the Polar V800 and the Garmin Forerunner 230 to predict V̇o
2max. J Strength Cond Res 35(5): 1403–1409, 2021—The purpose of this study was to compare maximal oxygen consumption (V̇o
2max) values (Amax) with predicted V̇o
2max values obtained from the Polar V800 (PV800) and the Garmin Forerunner 230 (GF230) to determine whether the accuracy of these estimates differs between sexes. The PV800 predicts V̇o
2max based on resting heart rate (HR). The GF230 predicts V̇o
2max based on a 10-minute, self-paced outdoor run. Subjects consisted of 22 women and 22 men. After a 10-minute supine rest, predicted V̇o
2max (Pmax) values from the PV800 were measured during a 5-minute supine rest. Subjects then completed a treadmill V̇o
2max test to determine Amax. Within 48 hours of obtaining Amax, individuals completed a 10-minute, self-paced outdoor run using the GF230 to predict V̇o
2max (Gmax). A 2-way (watch vs. sex) analysis of variance was used to determine whether there were differences between predicted V̇o
2max and Amax between sexes. A significant interaction between HR monitors and sex was found (p = 0.007). Follow-up analysis showed that in men, Pmax was significantly overestimated compared with Gmax (3.87 ± 1.53 ml·kg−1·min−1, p = 0.013). Bland-Altman plots revealed large random errors that ranged from 6.6 to 16.4 ml·kg−1·min−1 with the PV800 having larger errors than the GF230. The results of this study indicate that the GF230 can provide an accurate estimate of V̇o
2max in both sexes. The PV800 can provide an accurate estimate of V̇o
2max for women but not men. Estimates of V̇o
2max from the both devices should be used with caution because of the large random error associated with them.
Biophysical Follow-up of Age-Group Swimmers During a Traditional Three-Peak Preparation Program
Authors: Zacca Rodrigo , Azevedo Rui , Ramos Valdir R. , Abraldes José A. , Vilas-Boas João P. , Castro Flávio Antônio de Souza , Pyne David B. , Fernandes Ricardo J.
Published: January 2019

Zacca, R, Azevedo, R, Ramos, VR, Abraldes, JA, Vilas-Boas, JP, Castro, FAdS, Pyne, DB, and Fernandes, RJ. Biophysical follow-up of age-group swimmers during a traditional three-peak preparation program. J Strength Cond Res 34(9): 2585–2595, 2020—The aim of this study was to quantify changes and contributions of bioenergetic, technique, and anthropometric profiles across a traditional 3-peak swimming season. Twenty-four age-group swimmers (11 boys: 15 years 6 months ± 1 year 1 month; 13 girls: 14 years 5 months ± 10 months) of equal maturational stage were monitored through a 400-m test in front crawl (T400). Bioenergetic, technique, and anthropometric characteristics were compared before and after macrocycles I, II and III. Sex interaction was verified only for amplitude of the fast oxygen uptake component and height (moderate). Multiple linear regressions and principal component analysis were used to identify the most influential variables and the relative contribution of each domain (bioenergetics, technique, and anthropometrics) to changes in swimming performance of T400. The relative contributions for the performance of T400 after macrocycles I, II, and III were, respectively, 6, 18, and 27% for bioenergetics, 88, 69, and 54% for technique, and 6, 13, and 20% for anthropometrics. Technique was the biggest contributor (71%) for changes in the performance of T400 over the training season, followed by bioenergetics (17%) and anthropometrics (12%). Technique played the main role during the competitive season, regardless of gradual increase in the contribution of bioenergetics and anthropometrics. Despite that, bioenergetics and technique are closely connected, thus a powerful and endurable metabolic base and cannot be overlooked. Changes and contribution of bioenergetics, technique, and anthropometrics on age-group swimmers' performance over a traditional 3-peak swimming season could be described by the T400 swimming test, providing a comprehensive biophysical overview of the main contributors to swimming performance.
Repeatability and Specificity of Eccentric Force Output and the Implications for Eccentric Training Load Prescription
Authors: Harden Mellissa , Wolf Alex , Haff G. Gregory , Hicks Kirsty M. , Howatson Glyn
Published: January 2019

Harden, M, Wolf, A, Haff, GG, Hicks, KM, and Howatson, G. Repeatability and specificity of eccentric force output and the implications for eccentric training load prescription. J Strength Cond Res 33(3): 676–683, 2019—Prescribing supramaximal eccentric (ECC) loads based on repetition maximum, isometric (ISO), or concentric-only (CON) strength overlooks the possibility that individuals have a different tolerance for ECC exercise. To inform the prescription of ECC training regimes, this study implemented a test battery that included maximal accentuated-eccentric (ECC+), traditional coupled eccentric-concentric (TRAD), and 2 ISO conditions (90 and 120° knee-joint angle [ISO90 and ISO120, respectively]). The study aimed to determine the repeatability and specificity of ECC+ force output and assess the methodological accuracy when using nonspecific measures of strength to prescribe ECC+ training loads. Results show that the test battery was repeatable (p > 0.05, intraclass correlation coefficient >0.95, coefficient of variation: <5.8%) and force output was specific to each task; ECC+ (4,034 ± 592 N) was higher (p < 0.001) than ISO90 (3,122 ± 579 N) and TRAD (3,574 ± 581 N), but less (p < 0.001) than ISO120 (6,285 ± 1,546 N). Although estimations of ECC+ strength were not different from observed ECC+ values (p > 0.05), estimations were associated with up to a 7% error. This investigation confirms that force output is task-specific; therefore, prescribing ECC loads based on strength during another task will likely lead to discrepancies in intended and actual ECC exercise intensity. Consequently, using an ECC-specific approach to assess ECC strength qualities will provide a more accurate platform to prescribe individualized ECC training programs and a more definitive evaluation of ECC strength.
Lower-Load is More Effective Than Higher-Load Resistance Training in Increasing Muscle Mass in Young Women
Authors: Franco Cristiane Maria de Castro , Carneiro Marcelo Augusto da Silva , Alves Lucas Tatsuo Horinouchi , Júnior Gersiel Nascimento de Oliveira , de Sousa Jairo de Freitas Rodrigues , Orsatti Fábio Lera
Published: January 2019

Franco, CMdC, Carneiro, MAdS, Alves, LTH, Júnior, GNdO, de Sousa, JdFR, and Orsatti, FL. Lower-load is more effective than higher-load resistance training in increasing muscle mass in young women. J Strength Cond Res 33(7S): S152–S158, 2019—This study was designed to investigate the impact of load (higher vs. lower) performed until or close to volitional fatigue on muscle strength (MS) and fat and bone-free lean mass (FBFM) in young women. To do this, 32 women performed resistance training (RT) in 1 of 2 conditions: lower-load RT (LL; n = 14, age = 24.3 ± 4.8 years and body mass index [BMI] = 23.3 ± 2.8 kg·m−2) and higher-load RT (HL; n = 18, age = 23.0 ± 3.3 years and BMI = 22.4 ± 3.3 kg·m−2). Leg FBFM (DXA) and MS (1 repetition maximum—unilateral leg extension [LE]) were evaluated before and after 9 weeks (the first week was used for familiarization) of RT. Both groups performed 3 unilateral exercises (LE, leg curl, and leg press), 3 sets per exercise, 60–90 seconds of rest between sets, 2 days per week. In the LL group, the loads used in the exercises were the loads necessary to perform 30–35 repetitions in the first set. For the HL group, the loads used were the loads necessary to perform 8–10 repetitions in the first set. The LL group showed higher RT volume than the HL. Both groups showed leg muscle mass gains (p < 0.05). However, the LL group was better [p = 0.032 and effect size (eta2 = 0.14 [large]) than the HL group in leg FBFM gains (LL = 0.3 kg [IC 95%: 0.4 kg; 0.2 kg] and HL = 0.1 kg [IC 95%: 0.2 kg; 0.0 kg]). Both groups showed MS gains, without any difference between them (LL = 3.4 kg [IC 95%: 4.4 kg; 2.5 kg] and HL = 4.2 kg [IC 95%: 5.1 kg; 3.3 kg]; p = 0.239). Thus, lower-load RT is more effective than higher-load RT in increasing FBFM, but not MS in novice young women.
Inspiratory Muscle Warm-up Improves 3,200-m Running Performance in Distance Runners
Authors: Barnes Kyle R. , Ludge Allie R.
Published: January 2019

Barnes, KR and Ludge, AR. Inspiratory muscle warm-up improves 3,200-m running performance in distance runners. J Strength Cond Res 35(6): 1739–1747, 2021—This study examined the effects of an inspiratory muscle exercise as part of a warm-up (IMW) using a resisted breathing trainer on running performance. In a randomized crossover design, 17 trained distance runners completed two 3,200-m performance trials on separate days, preceded by 2 different warm-up procedures: IMW or sham IMW (CON). In each condition, subjects performed 30 breaths against either 50% of each athlete's peak strength (IMW) or 30 slow protracted breaths against negligible resistance (CON). Perceived race readiness and inspiratory muscle strength, flow, power, and volume were measured before and after each warm-up. Heart rate (HR), rating of perceived exertion (RPE) and dyspnea (RPD), and expired gases were collected during each trial. A 3,200-m run performance was 2.8% ± 1.5% (20.4-second) faster after IMW (effect size [ES] = 0.37, p = 0.02). After each warm-up condition, there was as small effect on peak inspiratory strength (6.6 ± 4.8%, ES = 0.22, p = 0.02), flow (5.2 ± 4.4%, ES = 0.20, p = 0.03), power (17.6 ± 16.7%, ES = 0.22, p = 0.04), and volume (6.7 ± 6.3%, ES = 0.24, p = 0.01) after IMW compared with CON. There were no differences in HR, minute volume, peak V̇o
2, or V̇o
2 at each 800-m interval between conditions (ES ≤ 0.13, p > 0.17). There were small differences in RPE at 800 m and 1,600 m (ES = 0.32, p = 0.17; ES = 0.21, p = 0.38, respectively), but no difference at the last 1,600 m (p = 1.0). There was a moderate positive effect on RPD (ES = 0.81, p < 0.001) and race readiness (ES = 0.76, p < 0.01) after IMW. Overall, the data suggest that IMW improves 3,200-m performance because of enhancements in inspiratory muscle function characteristics and reduction in dyspnea.
Effect of Acute Bouts of Volume-Matched High-Intensity Resistance Training Protocols on Blood Glucose Levels
Authors: Monroe Jacob C. , Naugle Kelly M. , Naugle Keith E.
Published: January 2019

Monroe, JC, Naugle, KM, and Naugle, KE. Effect of acute bouts of volume-matched high-intensity resistance training protocols on blood glucose levels. J Strength Cond Res 34(2): 445–450, 2020—Resistance exercise has the capability to alter glucose metabolism in healthy adults; however, to what extent single sessions of varying intensities of resistance exercise affect capillary glucose levels is not completely understood. The purpose of this study was to compare the effect of different resistance training intensities on capillary blood glucose levels in healthy adults. Thirteen resistance-trained men (age 24.4 ± 2.7 years) participated in an evaluation and 2 separate experimental resistance training sessions. The experimental sessions were a high-intensity resistance training session (HT) consisting of 7 sets of 3 repetitions at 90% of the participant's estimated 1 repetition maximum (e1RM), and a moderate-/high-intensity resistance training session (MT) consisting of 3 sets of 9 repetitions at 70% of the participant's e1RM. At least 7 days separated the completion of each session. Four glucose readings during each session were recorded using a capillary glucometer: G1 (baseline); G2 (pre-exercise); G3 (after exercise); and G4 (10 minutes after exercise). Results were analyzed using repeated-measures analysis of variances. Analysis revealed a significant decrease in blood glucose levels between G2 and G3, and G2 and G4 in both the HT and MT experimental sessions (p = 0.045). In addition, there was a significant difference in the magnitude of change in glucose levels from G2 to G3 between HT and MT (HT = −38.2 ± 5.3% SE, p = 0.042, MT = −22.2 ± 5.9% SE). Although both of the acute resistance exercise protocols decreased blood glucose levels in healthy men, a greater decrease in blood glucose levels from pre-exercise to post-exercise was observed in HT group compared with MT group.
Reliability of the OptoJump Next System for Measuring Temporal Values in Elite Racewalking
Authors: Hanley Brian , Tucker Catherine B.
Published: January 2019

Hanley, B and Tucker, CB. Reliability of the OptoJump Next system for measuring temporal values in elite racewalking. J Strength Cond Res 33(12): 3438–3443, 2019—Racewalking is an Olympic event where athletes are not permitted a visible loss of contact, with the result that competitors try to minimize flight times. The accuracy of measurements taken during testing is dependent on valid and reliable systems to determine temporal values. The aim of the study was to compare different methodologies used to measure contact and flight times in overground and treadmill racewalking. Eighteen racewalkers completed overground and instrumented treadmill trials at 5 speeds, during which flight and contact times were measured using the OptoJump Next photocell system (1,000 Hz), high-speed videography (500 Hz), and force plates (1,000 Hz). Results from OptoJump Next were extracted using 5 settings based on the number of light-emitting diodes (LEDs) activated (GaitIn_GaitOut) and annotated as 0_0, 1_1, 2_2, 3_3, and 4_4. Regarding flight time measurements for the overground condition, the 2_2 LED setting had the best 95% confidence interval (95% CI) for intraclass correlation coefficient (ICC) (0.978–0.988), the least bias (0.000 seconds), and the lowest random error (RE) (0.008 seconds). For the treadmill condition, the 0_0 LED setting had the best 95% CI for ICC (0.890–0.957), the least bias (0.004 seconds), and the lowest RE (0.017 seconds). Although high-speed videography also provided highly reliable results, the equally reliable and quicker availability of results using OptoJump Next is beneficial in laboratory-based testing. Coaches and researches are advised to alter the system's LED settings as appropriate and to report these settings with their findings.
Effect of Attentional Focus Strategies on the Biomechanical Performance of the Drop Jump
Authors: Comyns Thomas M. , Brady Claire J. , Molloy James
Published: January 2019

Comyns, TM, Brady, CJ, and Molloy, J. Effect of attentional focus strategies on the biomechanical performance of the drop jump. J Strength Cond Res 33(3): 626–632, 2019—Motor performance can be influenced by focusing an athlete's attention through the use of verbal instructions. There is limited research on the effect of internal, neutral, and external attentional focus strategies on drop jump (DJ) performance aimed at maximizing height jumped (HJ) and minimizing ground contact time (CT). The purpose of this study was to assess the effect of attentional focus strategies on biomechanical variables related to efficient DJ performance, namely HJ, CT, reactive strength index (RSI), leg-spring stiffness, and peak and relative peak ground reaction force (GRF). Seventeen male recreationally trained subjects performed 2 DJs after listening to instructions designed to evoke an internal, external, or neutral attentional focus. In total, 6 DJs were performed in the testing session, and the order of the instructions was randomly assigned. Significance was set at p ≤ 0.05. Results indicated that, compared with the neutral strategy, the external focus resulted in significantly higher RSI (p = 0.046), peak GRF (p = 0.025), relative GRF (p = 0.02), and leg-spring stiffness (p = 0.02). No significant difference was seen in DJ CT and HJ between all 3 conditions (p ≥ 0.05). These results indicate that the use of an external focus of attention may potentially result in a more effective and efficient fast stretch-shortening cycle performance because of the augmentation of RSI and leg stiffness. More research is warranted, however, because of the lack of significant results pertaining to CT and HJ.
Adaptive Changes on the Dominant Shoulder of Collegiate Handball Players—A Comparative Study
Authors: Vogler Tim , Schorn Dominik , Gosheger Georg , Kurpiers Nico , Schneider Kristian , Rickert Carolin , Andreou Dimosthenis , Liem Dennis
Published: January 2019

Vogler, T, Schorn, D, Gosheger, G, Kurpiers, N, Schneider, K, Rickert, C, Andreou, D, and Liem, D. Adaptive changes on the dominant shoulder of collegiate handball players—A comparative study. J Strength Cond Res 33(3): 701–707, 2019—Handball players are susceptible to adaptive bony and soft-tissue changes of the dominant shoulder. Our goal was to compare the glenohumeral range of motion and posterior capsule thickness between the dominant and nondominant arm of throwing athletes and between the dominant arm of nonthrowers and throwing athletes. Twenty-three collegiate handball players and 23 nonthrowing athletes underwent an examination of the dominant and the nondominant shoulder. Humeral retroversion and posterior capsule thickness were assessed with an ultrasound examination, whereas external rotation and internal rotation were determined with a digital inclinometer. The dominant shoulder of handball players had a significantly higher external rotation compared with their nondominant shoulder and the dominant shoulder of nonthrowing athletes. Furthermore, the dominant shoulder of handball players had a significantly lower internal rotation compared with their nondominant shoulder, with no differences compared with the dominant shoulder of the nonthrowing athletes. There was a trend for an increased posterior capsule thickness and an increased humeral retroversion between the dominant and the contralateral shoulder of handball players. Moreover, we found a significant increase in the capsule thickness of the dominant shoulder of throwing athletes compared with the dominant shoulder of nonthrowers. However, there were no differences in humeral retroversion. Our analysis suggests that a comparison of the dominant shoulder of overhead throwing athletes with the dominant shoulder of nonthrowing athletes might be more appropriate than the comparison of the dominant and the nondominant shoulder to evaluate the adaptive changes on the dominant side.
Initial Maximum Push-Rim Propulsion and Sprint Performance in Elite Wheelchair Rugby Players
Authors: García-Fresneda Adrian , Carmona Gerard , Padullés Xabier , Nuell Sergi , Padullés Josep M. , Cadefau Joan A. , Iturricastillo Aitor
Published: January 2019

García-Fresneda, A, Carmona, G, Padullés, X, Nuell, S, Padullés, JM, Cadefau, JA, and Iturricastillo, A. Initial maximum push-rim propulsion and sprint performance in elite wheelchair rugby players.J Strength Cond Res33(3): 857–865, 2019—Wheelchair rugby (WR) is an increasingly popular Paralympic sport; however, the evidence base supporting the validity and reliability of field tests to assess the physical condition of WR players is in its infancy. Therefore, here, we aimed to evaluate the intrasession reliability of the initial maximum push-rim propulsion (IMPRP) test and the sprint test, and to determine the relationships between IMPRP mechanical outputs and sprint performance variables. We studied 16 Spanish WR players (aged 33 ± 9 years). The maximum single wheelchair push from a stationary position and the sprint performance (i.e., times for 3, 5, and 12 m, and the maximum velocity) of elite WR players were measured in this study. The intraclass correlation coefficient, coefficient of variation, and standard error of measurement for IMPRP variables were >0.85, <10.6%, and <16.76, respectively; the corresponding values for a linear sprint were >0.97, <3.50%, and <0.15. In relation to IMPRP mechanical outputs (i.e., acceleration, maximum acceleration, force, maximum force, power, and maximum power) and sprint performance (i.e., times for 3, 5, and 12 m, and the maximum velocity), significant and large associations were observed in the WR players (r± confidence limit = −0.78 ± 0.17 to −0.90 ± 0.11; 0/0/100, most likely;R2= 0.613–0.812;p< 0.001). These tests provide simple and reliable methods for obtaining accurate mechanical pushing capacities and sprint performances of WR competitors (the 61.4–80.1% variance in sprint performance was explained by the IMPRP variables). These relationships indicate a need to implement specific strength exercises in WR players with the aim of improving the IMPRP and therefore improving sprint capacity.
Body Mass and Femur Length Are Inversely Related to Repetitions Performed in the Back Squat in Well-Trained Lifters
Authors: Cooke Daniel M. , Haischer Michael H. , Carzoli Joseph P. , Bazyler Caleb D. , Johnson Trevor K. , Varieur Robert , Zoeller Robert F. , Whitehurst Michael , Zourdos Michael C.
Published: January 2019

Cooke, DM, Haischer, MH, Carzoli, JP, Bazyler, CD, Johnson, TK, Varieur, R, Zoeller, RF, Whitehurst, M, and Zourdos, MC. Body mass and femur length are inversely related to repetitions performed in the back squat in well-trained lifters. J Strength Cond Res 33(3): 890–895, 2019—The purpose of this research note was to examine whether relationships existed between anthropometrics (body mass, body fat percentage [BF%], and femur length) and descriptive characteristics (age and sex) with repetitions performed to failure at 70% of 1 repetition maximum (1RM) in the back squat. Fifty-eight subjects (males = 43, females = 15; age: 23 ± 3 years, training age: 5.5 ± 2.5 years, body mass: 80.65 ± 16.34 kg, BF%: 10.98 ± 3.53%, and femur length: 47.1 ± 2.6 cm) completed a 1RM squat followed by one set to failure at 70% of 1RM. Total repetitions performed at 70% of 1RM were 14 ± 4 (range: 6–26). Bivariate correlations showed significant inverse relationships between body mass (r = −0.352, p = 0.003), BF% (r = −0.278, p = 0.014), and femur length (r = −0.265, p = 0.019), with repetitions performed. No significant relationships existed between age and sex (p > 0.05), with repetitions performed. All these variables entered into a standard multivariate regression. The model R
2 was 0.200, and body mass had the largest influence (p = 0.057) because relative importance analysis demonstrated body mass to contribute to 43.87% of the variance (of the R
2) in repetitions performed. No other variable was significant or approached significance (p > 0.05). Our results reveal that body mass, BF%, and femur length all are inversely related to repetitions performed at 70% of 1RM in the back squat.
Principal Component Analysis of the Biomechanical Factors Associated With Performance During Cutting
Authors: Welch Neil , Richter Chris , Franklyn-Miller Andy , Moran Kieran
Published: January 2019

Welch, N, Richter, C, Franklyn-Miller, A, and Moran, K. Principal component analysis of the biomechanical factors associated with performance during cutting. J Strength Cond Res 35(6): 1715–1723, 2021—The main aim of the current study was to investigate the relationship between kinematic variables in cutting and performance outcome across different angled cuts through the use of principal component analysis and permutation testing. Twenty-five male intercounty Gaelic football players (23.5 ± 4.2 years, 183 ± 6 cm, and 83 ± 6.9 kg) participated in the study. Three-dimensional motion capture was used to perform a biomechanical analysis of 110 and 45° cutting tasks. Principal component analysis and permutation testing revealed one principal component within the 45° cut (r = 0.26) and 2 principal components within the 110° (r = 0.66 and 0.27) cut that consistently correlated with performance outcome. Within the 45° cut, the identified principal component was interpreted as relating to performance cues of maintaining a low center of mass during the concentric phase, using a shorter ground contact time, resisting a reduction in lateral center of mass to ankle and knee distance in the eccentric phase, and using faster and larger extensions of the hip and knee. Within the 110° cut, the first identified principal component was interpreted as relating to performance cues of maintaining a low center of mass during the concentric phase, using a shorter ground contact time, resisting a reduction in lateral center of mass to ankle and knee distance in the eccentric phase, and resisting hip flexion then using hip extension. The second principal component was interpreted as relating to a performance cue of leaning in the direction of the cut.