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Sylvia Moeskops, Jon L Oliver, Paul J Read, John B Cronin, Gregory D Myer, G Gregory Haff, Rhodri S Lloyd
To investigate the within- and between-session reliability of the isometric mid-thigh pull (IMTP) in pre- and post-peak height velocity (PHV) female athletes. Nineteen pre- and nineteen post-PHV athletes performed bilateral IMTPs using a custom-designed isometric testing system. Participants attended three separate testing-sessions, and performed three trials within each session. Peak force, relative peak force, force at 30, 50, 90, 100, 150, 200, and 250 milliseconds, rate of force development (RFD) within time-specific bands, time to peak force (TPF), and time to peak rate of force development (TPRFD) were obtained for analysis...
March 15, 2018: Journal of Strength and Conditioning Research
Amr Almaz Abdel-Aziem, Elsadat Saad Soliman, Dalia Mohammed Mosaad, Amira Hussin Draz
[Purpose] To examine the effect of physiotherapy rehabilitation program on moderate knee osteoarthritis in patients with different pain intensities. [Subjects and Methods] Sixty subjects (37 men and 23 women) with moderate knee osteoarthritis participated in the current study. Randomization software was used to select the participating subjects' numbers from the clinic records. They were classified into three groups according to pain intensity: mild, moderate, and severe pain groups. All groups underwent a standard set of pulsed electromagnetic field, ultrasound, stretching exercises, and strengthening exercises...
February 2018: Journal of Physical Therapy Science
Gulsah Kinali, Ferda Dokuztuğ Üçsular
[Purpose] This study aimed to establish a scientific and clinical basis for the development of a method for the early diagnosis of cumulative trauma disorders experienced by mothers of disabled children. [Subjects and Methods] Ten volunteer mothers who came to a rehabilitation centre for the treatment of their children were included in this study. Surface electromyography measurements were taken during maximum isometric contraction through the extensor muscle motor point of the wrist of the mothers, and hand grip strength was measured...
February 2018: Journal of Physical Therapy Science
Débora Finger, Fábio Juner Lanferdini, Juliano Boufleur Farinha, Clarissa Müller Brusco, Lucas Helal, Francesco Pinto Boeno, Eduardo Lusa Cadore, Ronei Silveira Pinto
INTRODUCTION: Protein (PRO) combined with a carbohydrate (CHO) beverage may have an ergogenic effect on endurance performance. However, evidence regarding its efficacy on similar conditions to athletes' race day is still lacking. OBJECTIVE: To compare the effect of three different nutritional supplementation strategies on performance and muscle recovery in a duathlon protocol. METHODS: , 13 male athletes (29.7 ± 7.7 years) participated in three simulated Olympic-distance duathlons under three different, randomly assigned, supplementation regimens: carbohydrate drink (CHO, 75 g); isocaloric CHO plus protein drink (CHO+PRO, 60...
March 15, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
Benjamin S Killen, Krista L Zelizney, Xin Ye
CONTEXT: Static stretching (SS) and self-administered foam rolling (SAFR) are both effective techniques often used in rehabilitation settings to improve one's range-of-motion (ROM). However, their effects on non-intervened contralateral limb's performance remain equivocal. OBJECTIVE: To examine the acute effects of unilateral hamstrings SS and SAFR on the contralateral hip flexion passive ROM and the strength performance. DESIGN: Randomized crossover trial...
March 15, 2018: Journal of Sport Rehabilitation
Justin W Y Lee, Cheng Li, Patrick S H Yung, Kai-Ming Chan
Background/Objective: Evaluating hamstring strength by isokinetic dynamometry is limited by various practical issues such as time and cost. A video-based Nordic hamstring exercise is introduced as an alternative option. The aims of this study are to evaluate 1.) the between-session reliability and 2.) concurrent validity of the testing method compared to a standardized isokinetic dynamometry. Methods: Thirty male elite footballers were recruited for the study. From the Nordic hamstring exercise, the video-analysis-determined Nordic break-point angles where the participant could no longer withstand the force of the fall (eccentric mode) and the number of seconds that the player could hold at 30° forward flexion angle (isometric mode) were measured...
June 2017: Journal of Exercise Science and Fitness
Lucas Bet da Rosa Orssatto, Bruno Monteiro de Moura, Ewertton de Souza Bezerra, Lars Louis Andersen, Silas Nery de Oliveira, Fernando Diefenthaeler
Understanding the influence of strength training intensity on subsequent recovery in elderly is important to avoid reductions in physical function during the days following training. Twenty-two elderly were randomized in two groups: G70 (65.9 ± 4.8 years, n = 11) and G95 (66.9 ± 5.1, n = 11). Baseline tests included maximum voluntary isometric contraction (peak torque and rate of torque development - RTD), countermovement jump, and functional capacity (timed up and go, stairs ascent and descent)...
March 11, 2018: Experimental Gerontology
Summer B Cook, Brendan R Scott, Katherine L Hayes, Bethany G Murphy
Low-load blood flow restricted (BFR) resistance exercise has been suggested to be as effective as moderate and high-load resistance training for increasing muscle size and strength. The purpose of the study was to evaluate the effects of 6 weeks of HL or low-load BFR resistance training on neuromuscular function, strength, and hypertrophy of the knee extensors. Eighteen participants aged 18-22 years old were randomized to one of three training groups: moderate load (ML: 70% of 1 repetition maximum [1-RM]); BFR (20% 1-RM with a vascular restriction set to ~180 mmHg); and a control group (CON) that did not exercise...
March 2018: Journal of Sports Science & Medicine
Jaelson G Ortiz, Juliano F da Silva, Lorival J Carminatti, Luiz G A Guglielmo, Fernando Diefenthaeler
This study aims to analyze the physiological, neuromuscular, and biochemical responses in untrained women after eight weeks of regular participation in small-sided soccer games compared to aerobic training. Twenty-seven healthy untrained women were divided into two groups [soccer group (SG = 17) and running group (RG = 10)]. Both groups trained three times per week for eight weeks. The variables measured in this study were maximal oxygen uptake (VO2 max), relative velocity at VO2 max (vVO2 max), peak velocity, relative intensity at lactate threshold (vLT), relative intensity at onset of blood lactate accumulation (vOBLA), peak force, total cholesterol, HDL, LDL, triglycerides, and cholesterol ratio (LDL/HDL)...
March 2018: Journal of Sports Science & Medicine
Jieun Cho, Kyeongbong Lee, Minkyu Kim, Joohee Hahn, Wanhee Lee
This study aimed to investigate the effect of double oscillation exercise combined with elastic band exercise on the strength and thickness ratio of the scapular stabilizing muscles in healthy young individuals. A total of 30 subjects (17 male, 13 female) were randomly assigned to an elastic band exercise group (EBG) (n = 15) or an elastic band plus double oscillation exercise group (EB-DOG) (n = 15). A total of 28 subjects completed the experiment and evaluation. Patients in the EBG performed the elastic band exercise for shoulder flexion, extension, abduction, adduction, horizontal abduction/adduction, and internal/external rotation for 30 minutes/session, five times/week, for four weeks...
March 2018: Journal of Sports Science & Medicine
Brad Jon Schoenfeld, Andrew Vigotsky, Bret Contreras, Sheona Golden, Andrew Alto, Rachel Larson, Nick Winkelman, Antonio Paoli
The purpose of this study was to investigate the effects of using an internal versus external focus of attention during resistance training on muscular adaptations. Thirty untrained college-aged men were randomly assigned to an internal focus group (INTERNAL) that focused on contracting the target muscle during training (n = 15) or an external focus group (EXTERNAL) that focused on the outcome of the lift (n = 15). Training for both routines consisted of 3 weekly sessions performed on non-consecutive days for 8 weeks...
March 13, 2018: European Journal of Sport Science
Arnhild Bakken, Stephen Targett, Tone Bere, Cristiano Eirale, Abdulaziz Farooq, Andrea B Mosler, Johannes L Tol, Rod Whiteley, Karim M Khan, Roald Bahr
BACKGROUND: Lower extremity muscle strength tests are commonly used to screen for injury risk in professional soccer. However, there is limited evidence on the ability of such tests in predicting future injuries. PURPOSE: To examine the association between hip and thigh muscle strength and the risk of lower extremity injuries in professional male soccer players. STUDY DESIGN: Case-control study; Level of evidence, 3. METHODS: Professional male soccer players from 14 teams in Qatar underwent a comprehensive strength assessment at the beginning of the 2013/2014 and 2014/2015 seasons...
March 1, 2018: American Journal of Sports Medicine
Liam Bagley, Nasser Al-Shanti, Steven Bradburn, Osamah Baig, Mark Slevin, Jamie S McPhee
BACKGROUND: Regular sprint interval training (SIT) improves whole-body aerobic capacity and muscle oxidative potential, but very little is known about knee extensor anabolic or fatigue resistance adaptations, or whether effects are similar for males and females. The purpose of this study was to compare sex-related differences in knee extensor size, torque-velocity relationship and fatigability adaptations to 12 weeks SIT. METHODS: Sixteen males and fifteen females (mean (SEM) age: 41 (±2...
March 12, 2018: Journal of Strength and Conditioning Research
So Young Lee, Eun Young Han, Bo Ryun Kim, Sang Hee Im
OBJECTIVE: The aim of this study was to assess the effects of a motorized aquatic treadmill exercise program improve the isometric strength of the knee muscles, cardiorespiratory fitness, arterial stiffness, motor function, balance, functional outcomes and quality of life in subacute stroke patients. DESIGN: Thirty-two patients were randomly assigned to 4-week training sessions of either aquatic therapy(n=19) or land-based aerobic exercise(n=18). Isometric strength was measured using an isokinetic dynamometer...
March 12, 2018: American Journal of Physical Medicine & Rehabilitation
Nikos C Apostolopoulos, Ian M Lahart, Michael J Plyley, Jack Taunton, Alan M Nevill, Yiannis Koutedakis, Matthew Wyon, George S Metsios
Effects of passive static stretching intensity on recovery from unaccustomed eccentric exercise of right knee extensors was investigated in 30 recreationally active males randomly allocated into three groups: high-intensity (70-80% maximum perceived stretch), low-intensity (30-40% maximum perceived stretch), and control. Both stretching groups performed 3 sets of passive static stretching exercises of 60s each for hamstrings, hip flexors, and quadriceps, over 3 consecutive days, post-unaccustomed eccentric exercise...
March 12, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
Samuel T Orange, Phil Marshall, Leigh A Madden, Rebecca V Vince
This study compared the effects of a 4-week supervised (SUP) and unsupervised (UNSUP) resistance training programme followed by 12 weeks of detraining (DET). Thirty-six healthy aging adults (age: 53.6 ± 3.6 years; body mass index: 28.3 ± 5.1 kg/m) were randomly allocated to a SUP group (n = 17) or an UNSUP group (n = 19). Participants completed three training sessions per week using resistance bands and body weight movements. Measures of physical performance were administered at baseline, at the end of the training programme, and after the DET period...
March 6, 2018: Journal of Strength and Conditioning Research
A F Martinez, G C Lessi, C Carvalho, F V Serrao
Kinematic changes have been correlated with different lower limb injuries. Movement is influenced by multiple factors and strength is one of the contributors that can influence it. Thus, the aim of this study was to evaluate the correlation among trunk and hip isometric strength with trunk and lower-limb kinematics during a single-leg drop vertical jump. Twenty-three healthy recreational women athletes aged between 18 and 35 years underwent isometric evaluation of hip abductor, hip extensor, and lateral trunk muscle strength and three-dimensional trunk and lower-limb kinematics during a single-leg drop vertical jump...
March 6, 2018: Journal of Strength and Conditioning Research
Lucía Isidoro, Mercedes Ferrer, Mercedes Perusquía
BACKGROUND: Testosterone, 5α- and 5β-dihydrotestosterone (-DHT) induce an acute in vitro vasorelaxation and in vivo vasodepressor, hypotensive and antihypertensive responses. Our aim was to study whether androgen-induced blood pressure (BP) reduction is involved with a blockade of Ca2+ influx through L-type voltage-operated calcium channels (L-VOCCs) and/or the signaling pathways of α1 -adrenoceptors to induce vasoconstriction, which are one of the major mechanisms of BP maintenance...
March 12, 2018: Endocrine Research
David Bender, Jeremy R Townsend, William Vantrease, Autumn C Marshall, Ruth N Henry, Stephen Heffington, Kent D Johnson
The purpose of this study was to examine the effects of acute beetroot juice (BR) administration on repeated sprint performance and isometric force production in adolescent males. Twelve male adolescents (16.8 ± 1.0 yrs; 178.8 ± 9.2 cm; 74.8 ± 12.5 kg; peak height velocity: 2.53 ± 1.2 yrs) participated in this double-blind, placebo-controlled, crossover designed study. Participants consumed 2 x 70 mL of BR (~12.9 mmol NO3¯; Beet It Sport®) or a nitrate-depleted placebo (PL) 2.5 hours prior to performing isometric mid-thigh pulls (IMTP) and four repeated 20-second Wingate sprints (S1-S4) interspersed with 4 minutes of rest...
March 10, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
M Tavares-Silva, D Ferreira, S Cardoso, A R Raimundo, J Barbosa-Breda, A Leite-Moreira, A Rocha-Sousa
Urocortin 2 (UCN2) is a peptide related to corticotropin-releasing factor, capable of activating CRF-R2. Among its multisystemic effects, it has actions in all 3 muscle subtypes. This study's aim was to determine its potential role in two of the intrinsic eye muscle kinetics. Strips of iris sphincter (rabbit) and ciliary (bovine) muscles were dissected and mounted in isometric force-transducer systems filled with aerated-solutions. Contraction was elicited using carbachol (10(-6) M for iris sphincter, 10(-5) M for ciliary muscle), prior to all testing substances...
March 12, 2018: Physiological Research
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