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Rafael Sierra-Guzmán, Fernando Jiménez, Javier Abián-Vicén
BACKGROUND: Previous studies have reported the factors contributing to chronic ankle instability, which could lead to more effective treatments. However, factors such as the reflex response and ankle muscle strength have not been taken into account in previous investigations. METHODS: Fifty recreational athletes with chronic ankle instability and 55 healthy controls were recruited. Peroneal reaction time in response to sudden inversion, isokinetic evertor muscle strength and dynamic balance with the Star Excursion Balance Test and the Biodex Stability System were measured...
March 6, 2018: Clinical Biomechanics
Chris Brogden, Kelly Marrin, Richard Page, Matt Greig
CONTEXT: Clinical and functional assessments are performed regularly in sporting environments to screen for performance deficits and injury risk. Circadian rhythms have been demonstrated to affect human performance, however the influence of time of day on a battery of multiple ankle injury risk factors has yet to be established within athletic populations. OBJECTIVES: To investigate the influence of circadian variation on a battery of tests, used to screen for ankle aetiological risk factors...
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
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
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
Jin-Hyuck Lee, Jae-Won Heo, Dae-Hee Lee
BACKGROUND: Types of mechanoreceptors may differ between the medial and lateral menisci, suggesting that postural stability may differ between patients with medial and lateral meniscus tears. However, to date, postural stability has not been compared in patients with medial and lateral meniscus tears. This study used stabilometry to compare postural stability in patients with medial and lateral meniscus tears. METHODS: Postural stability and thigh muscle strength were assessed in 24 patients with medial and 18 patients with lateral meniscus tears...
March 7, 2018: Knee
Sydney C Karnovsky, Bridget Desandis, Andrea K Papson, Quinn O'Malley, Robert DiGiacomo, Martin J O'Malley, Taylor N Cabe, Mark C Drakos
BACKGROUND: Tibialis anterior tendon ruptures are rare and can cause significant dysfunction. Often, conservative measures are prescribed because of the morbidity of a tendon transfer as an operative solution. We present a novel reconstruction technique using hamstring autograft, which may obviate the need for local tendon transfer and long-term bracing. METHODS: Patients who underwent tibialis anterior reconstruction with hamstring autograft between 2011 and 2015 were screened for inclusion...
March 1, 2018: Foot & Ankle International
Eva-Maria Strasser, Marlene Hofmann, Bernhard Franzke, Barbara Schober-Halper, Stefan Oesen, Waltraud Jandrasits, Alexandra Graf, Markus Praschak, Barbara Horvath-Mechtler, Christine Krammer, Martin Ploder, Norbert Bachl, Michael Quittan, Karl-Heinz Wagner, Barbara Wessner
BACKGROUND: Age related loss of skeletal muscle mass is accompanied by changes in muscle quality leading to impairment of functional status. AIM: This study investigated the effect of resistance training and nutritional supply on muscle mass and muscle quality in very old institutionalized adults. DESIGN: Prospective, randomized, multi-arm parallel and controlled intervention study. SETTING: This study was conducted in five retirement care facilities...
March 7, 2018: European Journal of Physical and Rehabilitation Medicine
Federica Patrizio, Massimiliano Ditroilo, Francesco Felici, Guglielmo Duranti, Giuseppe De Vito, Stefania Sabatini, Massimo Sacchetti, Ilenia Bazzucchi
PURPOSE: To examine the effect of acute quercetin (Q) ingestion on neuromuscular function, biomarkers of muscle damage, and rate of perceived exertion (RPE) in response to an acute bout of resistance training. METHODS: 10 young men (22.1 ± 1.8 years, 24.1 ± 3.1 BMI) participated in a randomized, double-blind, crossover study. Subjects consumed Q (1 g/day) or placebo (PLA) 3 h prior to a resistance training session which consisted of 3 sets of 8 repetitions at 80% of the one repetition maximum (1RM) completed bilaterally for eight different resistance exercises...
March 6, 2018: European Journal of Applied Physiology
Hyoung-Kil Park, Min-Kyung Jung, Eunkyung Park, Chang-Young Lee, Yong-Seok Jee, Denny Eun, Jun-Youl Cha, Jaehyun Yoo
Performing warm-ups increases muscle temperature and blood flow, which contributes to improved exercise performance and reduced risk of injuries to muscles and tendons. Stretching increases the range of motion of the joints and is effective for the maintenance and enhancement of exercise performance and flexibility, as well as for injury prevention. However, stretching as a warm-up activity may temporarily decrease muscle strength, muscle power, and exercise performance. This study aimed to clarify the effect of stretching during warm-ups on muscle strength, muscle power, and muscle endurance in a nonathletic population...
February 2018: Journal of Exercise Rehabilitation
Amira Ben Moussa Zouita, Fatma Zohra Ben Salah, Catherine Dziri, Chris Beardsley
This study is aimed to perform and compare maximal concentric isokinetic trunk extension and flexion torques and powers between high-level athletes and a control population. In addition, the ratio of isokinetic trunk extension and flexion torques was measured, and compared between groups. Eighteen high-level male athletes and 15 male nonathletes without low back pain were recruited. Subjects performed isokinetic trunk extension and flexion at 60°/sec, 90°/sec, and 120°/sec through a maximal range of motion in a dynamometer...
February 2018: Journal of Exercise Rehabilitation
Shawn R Eagle, Chris Connaboy, Bradley C Nindl, Katelyn F Allison
Background: Musculoskeletal injuries to the extremities are a primary concern for the United States (US) military. One possible injury risk factor in this population is side-to-side strength imbalance. Purpose: To examine the odds of reporting a previous shoulder injury in US Marine Corps Ground Combat Element Integrated Task Force volunteers based on side-to-side strength differences in isokinetic shoulder strength. Study Design: Cohort study; Level of evidence, 3...
February 2018: Orthopaedic Journal of Sports Medicine
Anthony B Ciccone, Jake A Deckert, Cory R Schlabs, Max J Tilden, Trent J Herda, Philip M Gallagher, Joseph P Weir
Stimulation of the left insular cortex may affect heart rate variability (HRV) and exercise effort perception. These studies investigated the effects transcranial direct current stimulation (tDCS) and electrode orientation on HRV and repeated maximal knee extensions. In study 1, following sham stimulation, anodal left temporal lobe stimulation, or anodal right temporal lobe stimulation, 10 male and 10 female subjects (age=21.0±1.5 yr) completed 50 maximum isokinetic extensions at 180°s. There was a significant effect of stimulation condition on HRV for only one (SD2; p=...
February 27, 2018: Journal of Strength and Conditioning Research
M Travis Byrd, Brian J Wallace, Jody L Clasey, Haley C Bergstrom
This study examined the contribution of lower body strength and isokinetic peak torque measures to the prediction of critical power (CP) and anaerobic work capacity (AWC). Fourteen recreationally trained males (mean ± SD age: 22.4 ± 2.5 yrs; height: 177.9 ± 7.7 cm; body mass: 84.2 ± 12.4 kg) with anaerobic training experience completed this study. The lower body strength measures included one repetition max (1RM) bilateral back squat [BSq], isokinetic peak torque at 30°·sec [PT30] and isokinetic peak torque at 240°·sec [PT240]) of the dominant leg...
February 27, 2018: Journal of Strength and Conditioning Research
Minki Sin, Won-Seok Kim, Kyujin Cho, Sungmin Cho, Nam-Jong Paik
The conventional tools to measure spasticity exhibited insufficient test-retest or inter-rater reliability. Therefore, the spasticity measurement using an isokinetic device has been proposed to improve these reliabilities of the angle of catch (AoC) measurements; however, this proposal has not been investigated in a standardized manner. In this study, the comparison of the AoC measurement was performed using two modes (isokinetic and manual motion) to investigate whether the standardized isokinetic motion could increase the reliabilities...
February 3, 2018: Journal of Electromyography and Kinesiology
João Victor Novaretti, Carlos Eduardo Franciozi, Andrea Forgas, Pedro Henrique Sasaki, Sheila Jean McNeill Ingham, Rene Jorge Abdalla
BACKGROUND: There is a lack of literature-based objective criteria for return to sport after anterior cruciate ligament (ACL) injury. Establishing such objective criteria is crucial to improving return to sport after ACL reconstruction (ACLR). HYPOTHESES: Patients who return to their preinjury level of sport will have higher isokinetic, postural stability, and drop vertical jump test scores 6 months after surgery and greater patient satisfaction compared with those who did not...
February 1, 2018: Sports Health
Matt Greig
Kicking is a fundamental skill and a primary non-contact mechanism of injury in soccer, with injury incidence increasing during the latter stages of match-play. Ten male professional soccer players completed a 90min treadmill protocol based on the velocity profile of soccer match-play. Pre-exercise, and at 15 min intervals, players completed a maximal velocity kick subjected to kinematic analysis at 200 Hz. Pre-exercise, and at the end of each half, players also completed isokinetic concentric knee extensor repetitions at 180, 300 and 60 °·s-1 ...
February 27, 2018: Journal of Applied Biomechanics
Garrett M Hester, Zachary K Pope, Mitchel A Magrini, Ryan J Colquhoun, Alejandra B Curiel, Carlos A Estrada, Alex A Olmos, Jason M DeFreitas
This study examined the effects of unilateral resistance training (RT) on maximal velocity parameters in the ipsilateral and contralateral legs in young and older males. Young (n = 22; age = 21.55 ± 2.23 yrs) and older (n = 20; age = 65.10 ± 9.65 yrs) males were assigned to training or control groups. Unilateral isokinetic RT of the knee extensors was performed for 4 weeks. Peak velocity (PV) and acceleration were identified during a dynamic maximal voluntary contraction before, at week 2, and after week 4 (POST) of RT...
February 27, 2018: Journal of Aging and Physical Activity
Renan F H Nunes, Rodolfo A Dellagrana, Fábio Y Nakamura, Cosme F Buzzachera, Flavia A M Almeida, Lucinar J F Flores, Luiz G A Guglielmo, Sérgio G da Silva
Purpose/Background: Strength asymmetries are related to knee injuries in intermittent sports players. The purpose of this study was to examine whether elite futsal players demonstrate strength asymmetries during knee isokinetic testing applying the Croisier et al.21 criteria. Methods: Forty male elite (27.9 ± 6.5 years) Brazilian futsal players participated in the study. The testing protocol required players to perform concentric contractions of both quadriceps and hamstring muscles at angular velocities of 60 °·s-1 and 240 °·s-1 and eccentric contractions of hamstring at 30 °·s-1 and 120 °·s-1 ...
February 2018: International Journal of Sports Physical Therapy
Michael S Green, Tyler D Martin, Benjamin T Corona
Caffeine use is common among athletes seeking to capitalize on its potential ergogenic effects. Limited research has examined caffeine's effects when utilized following activities that resulted in exercise-induced muscle damage (EIMD). This study examined the effect of caffeine supplementation on uninjured and injured muscle. Eight male and female (N = 16) physically active individuals participated (age: 24.3 ± 4.3 y; height: 173.0 ± 7.0 cm, mass: 75.2 ± 11.5 kg; body fat: 18.2 ± 15.9 %). One leg was assessed under uninjured and injured (100 eccentric quadriceps contractions) conditions following caffeine supplementation (6 mg/kg), with the other leg assessed under both conditions following placebo supplementation...
February 22, 2018: Journal of Strength and Conditioning Research
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