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isokinetic muscle strength

Abdulrahman M Alfuraih, Ai Lyn Tan, Philip O'Connor, Paul Emery, Richard J Wakefield
BACKGROUND: Skeletal muscle undergoes structural changes with ageing which may alter its biomechanical properties. Shear wave elastography (SWE) may detect these changes by measuring muscle stiffness. AIMS: To investigate muscle stiffness in healthy young, middle-aged and elderly cohorts using SWE and correlate it with muscle strength and mass. METHODS: Shear wave velocity (SWV) was measured in the quadriceps, hamstrings and biceps brachii of 26 young (range 20-35 years), 21 middle-aged (40-55) and 30 elderly (77-94) volunteers...
February 14, 2019: Aging Clinical and Experimental Research
Fridolin Zinke, Torsten Warnke, Martijn Gäbler, Urs Granacher
In canoe sprint, the trunk muscles play an important role in stabilizing the body in an unstable environment (boat) and in generating forces that are transmitted through the shoulders and arms to the paddle for propulsion of the boat. Isokinetic training is well suited for sports in which propulsion is generated through water resistance due to similarities in the resistive mode. Thus, the purpose of this study was to determine the effects of isokinetic training in addition to regular sport-specific training on trunk muscular fitness and body composition in world-class canoeists and to evaluate associations between trunk muscular fitness and canoe-specific performance...
2019: Frontiers in Physiology
Xu-Dong Jiang, Han-Long Zheng, Yu-Ping Yang
PURPOSE: To evaluate the clinical outcome in patients who received anterior cruciate ligament (ACL) reconstruction via anteromedial portal with or without posterior wall blowout. METHODS: Twenty patients with ruptured ACL, who have received ACL reconstruction via anteromedial portal between Apr 2012 and Oct 2013 were enrolled. According to the conditions of posterior wall, the patients were divided into 2 groups: posterior wall blowout group (10 patients) and posterior wall intact group (10 patients)...
January 21, 2019: Chinese Journal of Traumatology, Zhonghua Chuang Shang za Zhi
Elisabeth Klupp, Barbara Cervantes, Sarah Schlaeger, Stephanie Inhuber, Florian Kreuzpointer, Ansgar Schwirtz, Alexander Rohrmeier, Michael Dieckmeyer, Dennis M Hedderich, Maximilian N Diefenbach, Friedemann Freitag, Ernst J Rummeny, Claus Zimmer, Jan S Kirschke, Dimitrios C Karampinos, Thomas Baum
BACKGROUND: The paraspinal muscles play an important role in the onset and progression of lower back pain. It would be of clinical interest to identify imaging biomarkers of the paraspinal musculature that are related to muscle function and strength. Diffusion tensor imaging (DTI) enables the microstructural examination of muscle tissue and its pathological changes. PURPOSE: To investigate associations of DTI parameters of the lumbar paraspinal muscles with isometric strength measurements in healthy volunteers...
February 5, 2019: Journal of Magnetic Resonance Imaging: JMRI
Iwona Sulowska, Anna Mika, Łukasz Oleksy, Artur Stolarczyk
The aim of this study was to evaluate the influence of plantar short foot muscles exercises on the performance of lower extremities in long-distance runners. 47 long-distance runners aged 21-45 years took part in this study. The participants were divided into two groups based on baseline measurement of Foot Posture Index: Group 1 (n=27) with neutral foot and Group 2 (n=20) with slight and increased pronation. The participants performed the exercises daily for 6 weeks. The knee flexors and extensors torque, work, and power on Isokinetic Dynamometer and Running-Based Anaerobic Sprint Test (RAST) were checked at baseline and after 6 weeks of exercises...
2019: BioMed Research International
Conor Fryer, Matthew P Ithurburn, Michael P McNally, Staci Thomas, Mark V Paterno, Laura C Schmitt
BACKGROUND: Lower extremity landing asymmetries are common and associated with strength deficits after anterior cruciate ligament reconstruction. However, less is known regarding trunk control during landing. This study's hypotheses were that frontal plane trunk excursion during single-leg landing would be greater in young athletes after anterior cruciate ligament reconstruction compared to controls and would be associated with strength deficits. METHODS: Participants included 130 young athletes recently cleared for return-to-sport following anterior cruciate ligament reconstruction and 56 uninjured young athletes...
November 30, 2018: Clinical Biomechanics
Daniel Collado-Mateo, Francisco J Dominguez-Muñoz, Nuno Batalha, Jose Parraça, Pablo Tomas-Carus, Jose C Adsuar
Swimming motor patterns lead internal rotators to grow stronger than antagonist muscles, what may increase the risk of injury in swimmers. Injury prevention often involves the improvement of external rotators strength, as well as the external rotation/internal rotation ratio. The current research aimed to evaluate the test-retest reliability of shoulder concentric rotation strength in competitive swimmers using an isokinetic dynamometer. The study enrolled 35 competitive swimmers aged between 13 and 19 years...
December 2018: Journal of Human Kinetics
Annette Y Karim, Caleb Ashmore, Sara Burris, Toni Roddey, Alexis Ortiz, Sharon Olson
BACKGROUND: Prior studies have examined muscle power via the countermovement jump (CMJ). Studies to date have examined neither the reliability nor the construct validity of the ballet first position CMJ (hips in lateral rotation, toes facing away from one another, legs straight) as a measure of power. HYPOTHESES: There would be (1) good interrater reliability in the visual assessment of the best-quality first position CMJ (κ ≥ 0.60), (2) good test-retest reliability in the height of the first position CMJ of good quality (intraclass correlation coefficient [ICC] ≥ 0...
January 24, 2019: Sports Health
Jesús Seco-Calvo, Juan Mielgo-Ayuso, César Calvo-Lobo, Alfredo Córdova
CONTEXT: Despite prior studies having addressed the recovery effects of cold water immersion in different sports, there is a lack of knowledge about longitudinal studies across a full season of competition assessing these effects. OBJECTIVE: To analyse the cold water immersion effects, as a muscle recovery strategy, in professional basketball players throughout a competitive season. DESIGN: A prospective cohort design. SETTING: Elite basketball teams...
January 24, 2019: Journal of Sport Rehabilitation
Afshin Moghadasi, GholamAli Ghasemi, Ebrahim Sadeghi-Demneh, Masoud Etemadifar
CONTEXT: Muscle weakness and sensory deficits cause impaired balance and walking abilities which are prerequisites for independent activity of daily living in people with multiple sclerosis. Recent physical exercises tailored to improve the activity of daily living people with multiple sclerosis have focused on the functional training. OBJECTIVE: The aim of this study was to investigate the effect of total body resistance exercise suspension training on mobility, proprioception and muscle strength of the knee in people with multiple sclerosis...
January 24, 2019: Journal of Sport Rehabilitation
Hellen C G Nabuco, Crisieli M Tomeleri, Rodrigo R Fernandes, Paulo Sugihara Junior, Edilaine F Cavalcante, Danielle Venturini, Décio S Barbosa, Analiza M Silva, Luís B Sardinha, Edilson S Cyrino
The objective of this study was to investigate the effects of protein intake beyond habitual intakes associated with resistance training (RT) on metabolic syndrome (MetS)-related parameters, isokinetic strength and body composition in health older women. Thirty older women (68.8 ± 4.3 years) participated in this investigation and were assigned to receive 35 grams of whey protein or placebo combined with RT, over 12-weeks, 3 times per week. Blood samples, blood pressure, dietary intake, strength, and body composition were assessed before and after the intervention period...
January 24, 2019: Journal of Aging and Physical Activity
Simon von Stengel, Marc Teschler, Anja Weissenfels, Sebastian Willert, Wolfgang Kemmler
Background/Objective: In soccer the recovery time between matches is often not long enough for complete restoration. Insufficient recovery can result in reduced performance and a higher risk of injuries. The purpose of this study was to evaluate the potential of Deep Oscillation (DO) as a recovery method. Methods: In a randomized crossover study including 8 male soccer players (22 ± 3.3 years) the following parameters were evaluated directly before and 48 h after a fatiguing soccer-specific exercise: Maximum isokinetic strength of the leg and hip extensors and flexors (Con-Trex® Leg Press, Physiomed, Germany), rating of perceived exertion (RPE) during isokinetic testing (Borg scale 6-20), creatine kinase (CK) serum levels and Delayed Onset Muscle Soreness (DOMS; visual analogue scale 1-10)...
December 2018: Journal of Exercise Science and Fitness
Oscar Horwath, Gøran Paulsen, Tobias Esping, Olivier Seynnes, M Charlotte Olsson
OBJECTIVES: To determine the combined effects of slow isokinetic resistance training and eccentric overload and compare it to traditional resistance training on strength, power, body composition and muscle hypertrophy in young ice hockey players. DESIGN: Experimental, randomized trial. METHODS: Twenty-two resistance-trained ice hockey players (18±1year) were assigned to either isokinetic resistance training and eccentric overload (ISO/ECC; n=11) or traditional resistance training (TRAD; n=11)...
January 6, 2019: Journal of Science and Medicine in Sport
Min-Suk Kang, Jooyoung Kim, Joohyung Lee
The objective of the present study was to examine the effects of different muscle contraction interventions using isokinetic dynamometers on the muscle recovery after muscle injury caused by eccentric exercise. A total of 28 healthy male adults participated in the present study and each subject was randomly assigned to eccentric muscle contraction (EC, n=7), concentric muscle contraction (CC, n=7), both eccentric and concentric muscle contraction (BEC, n=7), and control (CON, n=7) groups after performing eccentric exercise...
December 2018: Journal of Exercise Rehabilitation
Julianna M Bores, Andrew J Murton, Shauna Q Glover, Ileana Gutierrez, Clark R Andersen, David N Herndon, Jong O Lee, Oscar E Suman
Isokinetic dynamometry is used during exercise testing and rehabilitation to obtain a quantitative strength measurement on which progressive strength training programs can be based. This study assesses the test-retest reliability of isokinetic leg function in the knee flexors and extensors at 150 degrees/second in children and young adults with severe burns to be used for rehabilitation exercise program prescription. In 39 severely burned patients (49 ± 14% total body surface area burn [TBSA], mean ± SD; 34 ± 21% TBSA 3 rd degree; 14 ± 5 years, 153...
January 9, 2019: Journal of Burn Care & Research: Official Publication of the American Burn Association
Eric N Bowman, Rami Elshaar, Heather Milligan, Gregory Jue, Karen Mohr, Patty Brown, Drew M Watanabe, Orr Limpisvasti
BACKGROUND: Blood flow restriction (BFR) training involves low-weight exercises performed under vascular occlusion via an inflatable cuff. For patients who cannot tolerate high-load exercises, BFR training reportedly provides the benefits of high-load regimens, with the advantage of less tissue and joint stress. HYPOTHESIS: Low-load BFR training is safe and efficacious for strengthening muscle groups proximal, distal, and contralateral to tourniquet placement in the lower extremities...
January 14, 2019: Sports Health
Xiaodan Liu, Peijun Li, Lu Xiao, Yufan Lu, Ning Li, Zhengrong Wang, Hongxia Duan, Jian Li, Weibing Wu
BACKGROUND: Chronic obstructive pulmonary disease (COPD) not only affects pulmonary function but also leads to skeletal muscle dysfunction. The various characteristics of different forms of traditional Chinese exercise lead to inconsistent clinical effects in COPD patients. Hence, the present study carefully combined and rearranged liuzijue, wuqinxi, baduanjin, and yijinjing into a pulmonary exercise program targeting COPD patients. METHODS/DESIGN: This study is a single-blind, randomized controlled trial...
January 11, 2019: Trials
Claudio de Lira, Valentine Vargas, Wallace Silva, André Bachi, Rodrigo Vancini, Marilia Andrade
Exercise has been suggested for older adults. However, there is no consensus whether exercising older adults present better strength levels and body composition indexes compared with inactive counterparts. Our aim was to compare absolute and relative isokinetic muscular knee strength and body composition between exercising and non-exercising older women. Exercising (n = 20) and non-exercising (n = 21) groups were evaluated for body mass index (BMI), body composition, and isokinetic muscular knee strength. BMI ( p = 0...
January 10, 2019: Sports
Scott W Talpey, Robert Axtell, Elizabeth Gardner, Lachlan James
The tactical and technical components of training become a primary emphasis, leaving less time for targeted development of physical qualities that underpin performance during the competition phase of a training program. A deemphasis on physical preparation during the in-season training phase may make athletes more susceptible to injury and decrease performance on the field. Two weeks prior to the start and one week following the conclusion of the 16-week collegiate lacrosse season, lower body force production was assessed in eight National Collegiate Athletic Association (NCAA) Division I Men's Lacrosse athletes...
January 9, 2019: Sports
Tyler Barker, Victoria E Rogers, Vanessa T Henriksen, Brian M Dixon, Nathan G Momberger, G Lynn Rasmussen, Roy H Trawick
Muscular (i.e., quadriceps) weakness contributes to disease progression and precedes the appearance of patient-reported symptoms, such as pain and perceived physical dysfunction, in knee osteoarthritis (OA). It is unknown, however, if muscular-based and patient-reported outcomes differentially associate with systemic biomarkers reflective of the local mediators in knee OA. The purpose of this study was to identify if muscular-based and patient-reported outcomes differentially associate with circulating superoxide dismutase (SOD) and cytokines in knee OA...
January 8, 2019: Cytokine
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