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Isokinetic and muscle damage

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https://www.readbyqxmd.com/read/29099680/pre-exercise-infrared-photobiomodulation-therapy-810%C3%A2-nm-in-skeletal-muscle-performance-and-postexercise-recovery-in-humans-what-is-the-optimal-power-output
#1
Adriano Rodrigues de Oliveira, Adriane Aver Vanin, Shaiane Silva Tomazoni, Eduardo Foschini Miranda, Gianna Móes Albuquerque-Pontes, Thiago De Marchi, Vanessa Dos Santos Grandinetti, Paulo Roberto Vicente de Paiva, Treice Beatriz Gonçalves Imperatori, Paulo de Tarso Camillo de Carvalho, Jan Magnus Bjordal, Ernesto Cesar Pinto Leal-Junior
BACKGROUND: Photobiomodulation therapy (PBMT) has recently been used to alleviate postexercise muscle fatigue and enhance recovery, demonstrating positive results. A previous study by our research group demonstrated the optimal dose for an infrared wavelength (810 nm), but the outcomes could be optimized further with the determination of the optimal output power. OBJECTIVE: The aim of the present study was to evaluate the effects of PBMT (through low-level laser therapy) on postexercise skeletal muscle recovery and identify the best output power...
November 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/29077637/contralateral-repeated-bout-effect-of-the-knee-flexors
#2
Trevor C Chen, Ming-Ju Lin, Hsin-Lian Chen, Hui-Yi Yu, Kazunori Nosaka
PURPOSE: Eccentric exercise of the elbow flexors (EF) confers protective effect against muscle damage of the same exercise performed by the opposite arm at 1, 7 or 28 days later. This is known as the contralateral repeated bout effect (CL-RBE), but it is not known whether CL-RBE is evident for the knee flexors (KF). The present study tested the hypothesis that KF CL-RBE would be observed at 1, 7 and 28 days after the initial bout. METHODS: Young untrained men were assigned to a control or one of three experimental groups (n=13/group)...
October 26, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29039798/the-effect-of-taurine-on-the-recovery-from-eccentric-exercise-induced-muscle-damage-in-males
#3
Yanita McLeay, Stephen Stannard, Matthew Barnes
Eccentric exercise is known to bring about microstructural damage to muscle, initiating an inflammatory cascade involving various reactive oxygen species. This, in turn, can significantly impair physical performance over subsequent days. Taurine, a powerful endogenous antioxidant, has previously been shown to have a beneficial effect on muscle damage markers and recovery when taken for a few days to several weeks prior to eccentric exercise. However, to date no studies have looked at the effects of supplementing over the days following eccentric exercise on performance recovery...
October 17, 2017: Antioxidants (Basel, Switzerland)
https://www.readbyqxmd.com/read/29038027/tumor-necrosis-factor-alpha-and-soluble-tnf-alpha-receptor-responses-in-young-vs-middle-aged-males-following-eccentric-exercise
#4
Eliott Arroyo, Adam J Wells, Joseph A Gordon, Alyssa N Varanoske, Yftach Gepner, Nicholas A Coker, David D Church, David H Fukuda, Jeffrey R Stout, Jay R Hoffman
BACKGROUND: Tumor necrosis factor-alpha (TNF-α) has been shown to be implicated in both muscle regeneration and muscle wasting. However, it remains unclear whether TNF-α is responsible for the age-related losses in muscle size and function. Also, due to the high clearance rate of TNF-α from circulation, analyzing the circulating levels of soluble TNF-α receptors 1 and 2 (STNFR1 and STNFR2) may provide a better indication of inflammatory events. The aim of this study was to examine changes in circulating concentrations of TNF-α, STNFR1, and STNFR2 following acute eccentric exercise in young (YA) and middle-aged (MA) men...
October 14, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28859014/comparisons-in-the-recovery-response-from-resistance-exercise-between-young-and-middle-aged-men
#5
Joseph A Gordon, Jay R Hoffman, Eliott Arroyo, Alyssa N Varanoske, Nicholas A Coker, Yftach Gepner, Adam J Wells, Jeffrey R Stout, David H Fukuda
The purpose of this study was to compare the effects of a bout of high-volume isokinetic resistance exercise (HVP) on lower-body strength and markers of inflammation and muscle damage during recovery between young and middle-aged men. Nineteen recreationally-trained men were classified as either a young adult (YA: 21.8 ± 2.0 y; 90.7 ± 11.6 kg) or middle-aged adult (MA: 47.0 ± 4.4 y; 96.0 ± 21.5 kg) group. The HVP consisted of 8 sets of 10 repetitions, with one minute of rest between each set, performed on an isokinetic dynamometer at 60°·sec...
August 29, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28689372/deficits-of-ankle-muscle-strength-not-found-in-children-adolescents-and-young-adults-with-haemophilic-ankle-arthropathy
#6
S Lobet, J-L Croisier, A-C Lantin, C Hermans, K Peerlinck, J Vandesande, J-B Pialat, K Deschamps
OBJECTIVES: Adequate management of haemophilia patients requires early detection of joint impairment in relatively asymptomatic patients. This study sought to quantify the impact of the ankle's structural impairment on muscle strength in children, adolescent and young adults with haemophilia (CAAwH). METHODS: Twenty-three CAAwH underwent bilateral magnetic resonance imaging (MRI) assessing the anatomical status of tibiotalar joint (TTJ) and subtalar joint (STJ) using the International Prophylaxis Study Group MRI scale...
July 9, 2017: Haemophilia: the Official Journal of the World Federation of Hemophilia
https://www.readbyqxmd.com/read/28680370/effects-of-a-combined-protein-and-antioxidant-supplement-on-recovery-of-muscle-function-and-soreness-following-eccentric-exercise
#7
Stephen J Ives, Samuel Bloom, Alexs Matias, Noelle Morrow, Natalya Martins, Yookee Roh, Daniel Ebenstein, Gabriel O'Brien, Daniela Escudero, Kevin Brito, Leah Glickman, Scott Connelly, Paul J Arciero
BACKGROUND: An acute bout of eccentric contractions (ECC) cause muscle fiber damage, inflammation, impaired muscle function (MF) and muscle soreness (MS). Individually, protein (PRO) and antioxidant (AO) supplementation may improve some aspects of recovery from ECC, though have yet to be combined. We sought to determine if combined PRO and AO supplementation (PRO + AO) improves MS and MF following damaging ECC over PRO alone. METHODS: Sixty sedentary college-aged males participated in a randomized, single-blind, parallel design study of peak isometric torque (PIMT), peak isokinetic torque (PIKT), thigh circumference (TC), and muscle soreness (MS) of knee extensor muscles measured at baseline, immediately after and 1, 2, 6, and 24 h after completion of 100 maximal ECC...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28596973/quadriceps-strength-in-patients-with-isolated-cartilage-defects-of-the-knee-results-of-isokinetic-strength-measurements-and-their-correlation-with-clinical-and-functional-results
#8
Anja Hirschmüller, Tasja Andres, Wolfgang Schoch, Heiner Baur, Lukas Konstantinidis, Norbert P Südkamp, Philipp Niemeyer
BACKGROUND: Recent studies have found a significant deficit of maximum quadriceps strength after autologous chondrocyte implantation (ACI) of the knee. However, it is unclear whether muscular strength deficits in patients with cartilage damage exist prior to operative treatment. PURPOSE: To isokinetically test maximum quadriceps muscle strength and quantify the impact of possible strength deficits on functional and clinical test results. STUDY DESIGN: Cross-sectional study; Level of evidence, 3...
May 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28447186/comparison-of-the-recovery-response-from-high-intensity-and-high-volume-resistance-exercise-in-trained-men
#9
Sandro Bartolomei, Eliahu Sadres, David D Church, Eliott Arroyo, Joseph A Gordon Iii, Alyssa N Varanoske, Ran Wang, Kyle S Beyer, Leonardo P Oliveira, Jeffrey R Stout, Jay R Hoffman
PURPOSE: The purpose of this study was to compare the physiological responses of a high-volume (HV; 8 sets of 10 repetitions) versus high-intensity (HI; 8 sets of 3 repetitions) exercise protocol in resistance-trained men. METHODS: Twelve men (24.5 ± 4.2 years; 82.3 ± 8.4 kg; 175.2 ± 5.5 cm) with 6.3 ± 3.4 years of resistance training experience performed each protocol in a counterbalanced, randomized order. Performance [counter movement jump peak power (CMJP), isokinetic (ISOK) and isometric leg extension (MVIC), isometric mid-thigh pull (IMTP), and isometric squat (ISQ)] and muscle morphological [cross-sectional area (CSA) of vastus lateralis] assessments were performed at baseline (BL), 30-min (P-30 min), 24-h (P-24 h), 48-h (P-48 h), and 72-h (P-72 h) post-exercise for each testing session...
July 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28321637/the-time-course-of-short-term-hypertrophy-in-the-absence-of-eccentric-muscle-damage
#10
RANDOMIZED CONTROLLED TRIAL
Matt S Stock, Jacob A Mota, Ryan N DeFranco, Katherine A Grue, A Unique Jacobo, Eunhee Chung, Jordan R Moon, Jason M DeFreitas, Travis W Beck
BACKGROUND: It has been proposed that the increase in skeletal muscle mass observed during the initial weeks of initiating a resistance training program is concomitant with eccentric muscle damage and edema. PURPOSE: We examined the time course of muscle hypertrophy during 4 weeks of concentric-only resistance training. METHODS: Thirteen untrained men performed unilateral concentric-only dumbbell curls and shoulder presses twice per week for 4 weeks...
May 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28271312/chronic-effects-of-superimposed-electromyostimulation-during-cycling-on-aerobic-and-anaerobic-capacity
#11
RANDOMIZED CONTROLLED TRIAL
Sebastian Mathes, Niklas Lehnen, Tobias Link, Wilhelm Bloch, Joachim Mester, Patrick Wahl
PURPOSE: To examine if chronic endurance training by means of simultaneously applied, superimposed electromyostimulation (EMS) can be used to improve performance and physiological core parameters compared to the traditional cycling. METHODS: Twenty-one male subjects (VO2peak 55.2 ± 5.1 ml min(- 1) kg(- 1)) were assigned to either a cycling (C) or cycling with superimposed EMS (C + E) group. Before and after the 4-week training period, including 14 sessions of moderate cycling [60 min at 60% peak power output (PPO)], participants performed a 20-min time-trial, a step test to exhaustion, a 30-s isokinetic sprint test, and maximum force- and power-tests...
May 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28229572/coenzyme-q10-does-not-prevent-exercise-induced-muscle-damage-and-oxidative-stress-in-sedentary-men
#12
Nilsel Okudan, Muaz Belviranli, Savaş Torlak
BACKGROUND: The objective of this study was to examine the effects of coenzyme Q10 (CoQ10) supplementation on exercise-induced muscle damage and oxidative stress in sedentary young men. In this study, a total of twenty one sedentary and healthy young men participated. METHODS: Participants were assigned at random to a CoQ10 or a placebo group employing a double-blind method. Those in the CoQ10 group ingested 200 mg CoQ10 per day for 4 weeks. Those in the placebo group ingested the same dosage of a placebo...
February 22, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28213750/effect-of-an-acute-dose-of-omega-3-fish-oil-following-exercise-induced-muscle-damage
#13
RANDOMIZED CONTROLLED TRIAL
J R Jakeman, D M Lambrick, B Wooley, J A Babraj, J A Faulkner
PURPOSE: The purpose of this double-blind, placebo-controlled study was to examine the effect of two fish oil supplements, one high in EPA (750 mg EPA, 50 mg DHA) and one low in EPA (150 mg EPA, 100 mg DHA), taken acutely as a recovery strategy following EIMD. METHODS: Twenty-seven physically active males (26 ± 4 year, 1.77 ± 0.07 m, 80 ± 10 kg) completed 100 plyometric drop jumps to induce muscle damage. Perceptual (perceived soreness) and functional (isokinetic muscle strength at 60° and 180° s(-1), squat jump performance and countermovement jump performance) indices of EIMD were recorded before, and 1, 24, 48, 72, and 96h after the damaging protocol...
March 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28165870/a-comparison-of-exercise-induced-muscle-damage-following-maximal-eccentric-contractions-in-men-and-boys
#14
Chariklia K Deli, Ioannis G Fatouros, Vassilis Paschalis, Kalliopi Georgakouli, Athanasios Zalavras, Alexandra Avloniti, Yiannis Koutedakis, Athanasios Z Jamurtas
PURPOSE: Research regarding exercise-induced muscle-damage mainly focuses on adults. The present study examined exercise-induced muscle-damage responses in adults compared with children. METHOD: Eleven healthy boys (10-12 y) and 15 healthy men (18-45 y) performed 5 sets of 15 maximal eccentric contractions of the knee extensors. Range of motion (ROM), delayed onset muscle soreness (DOMS) during squat and walking, and peak isometric, concentric and eccentric torque were assessed before, post, 24, 48, 72, and 96 hr postexercise...
August 2017: Pediatric Exercise Science
https://www.readbyqxmd.com/read/28060273/induction-and-assessment-of-exertional-skeletal-muscle-damage-in-humans
#15
Michael R Deyhle, Jacob R Sorensen, Robert D Hyldahl
Contraction-induced muscle damage via voluntary eccentric (lengthening) contractions offers an excellent model for studying muscle adaptation and recovery in humans. Herein we discuss the design of an eccentric exercise protocol to induce damage in the quadriceps muscles, marked by changes in strength, soreness, and plasma creatine kinase levels. This method is simple, ethical, and widely applicable since it is performed in human participants and eliminates the interspecies translation of the results. Subjects perform 300 maximal eccentric contractions of the knee extensor muscles at a speed of 120°/sec on an isokinetic dynamometer...
December 11, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27941488/no-differences-between-alter-g-trainer-and-active-and-passive-recovery-strategies-on-isokinetic-strength-systemic-oxidative-stress-and-perceived-muscle-soreness-after-exercise-induced-muscle-damage
#16
Matthew B Cooke, Carrie Nix, Lori Greenwood, Mike Greenwood
The incidence of muscle injuries is prevalent in elite sport athletes as well as weekend warriors and strategies that safely and effectively hasten recovery are highly desirable. The purpose of this study was to examine the differences between three recovery methods after eliciting muscle damage in recreationally active men relative to maximal isokinetic contractions, perceived muscle soreness and psychological mood states. Twenty-five recreationally active men (22.15±3.53yrs, 75.75±11.91kg, 180.52±7.3cm) were randomly matched by VO2 peak (53...
November 28, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27768503/effect-of-alcohol-consumption-on-recovery-from-eccentric-exercise-induced-muscle-damage-in-females
#17
RANDOMIZED CONTROLLED TRIAL
Yanita McLeay, Stephen R Stannard, Toby Mundel, Andrew Foskett, Matthew Barnes
This study was designed to investigate the effects of alcohol consumption on recovery of muscle force when consumed immediately postexercise in young females. Eight young women completed 300 maximal eccentric actions of the quadriceps femoris muscle on an isokinetic dynamometer on two occasions in a randomized, cross-over design after which an alcoholic beverage (0.88g ethanol/kg body weight) or an iso-caloric placebo was consumed. Maximal isokinetic (concentric and eccentric) torque and isometric tension produced across the knee were measured in both the exercised and control leg predamage, 36 hr post, and 60 hr post damage...
April 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/27677023/validation-of-upper-limb-motor-assessment-tasks-using-a-rehabilitation-robot-in-healthy-children
#18
Stéphanie Dehem, Thierry Lejeune, Gaëtan Stoquart, Christine Detrembleur, Anne Renders, Martin Edwards, Charlotte Clarinval, Cécile Frognet, Isaline Brouwers, Vincenza Montedoro, Daniel Galinski
OBJECTIVE: To validate, establish norms and evaluate the reproducibility of upper limb motor assessment tasks using REAplan in healthy children. REAplan is a rehabilitation robotic device allowing upper limb mobilization in the horizontal plane. MATERIAL/PATIENTS AND METHODS: Forty-nine healthy children between six and twelve years participated in this study. Each child was assessed clinically and with REAplan, and twelve children were assessed twice. Elbow flexor and extensor muscles force were assessed with an isometric dynamometer Microfet II...
September 2016: Annals of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/27676836/isokinetic-hip-in-soccer-players-moroccan-experience-about-36-cases
#19
Karima Belhaj, Soumia Meftah, Siham Zahi, Fatima Lmidmani, Abdellatif Elfatimi
OBJECTIVE: Isokinetic evaluation allows accurate and reproducible measurement of dynamic muscle strength. It has several application areas, especially in sports, it allows the evaluation, rehabilitation and re-entrainment. It is rarely used for the hip joint. The objective of this study was to report the isokinetic profile of the abductor and adductor muscles of the hip in Moroccan professional players, while comparing players with a history of groin for those without medical history at the hip...
September 2016: Annals of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/27632383/differences-in-post-exercise-t2-relaxation-time-changes-between-eccentric-and-concentric-contractions-of-the-elbow-flexors
#20
COMPARATIVE STUDY
Eisuke Ochi, Yosuke Tsuchiya, Kazunori Nosaka
PURPOSE: This study compared maximal eccentric (ECC) and concentric (CON) contractions of the elbow flexors for changes in transverse relaxation time (T2) and indirect markers of muscle damage. METHODS: Twelve young men performed five sets of six maximal isokinetic (30°/s) ECC with one arm followed by CON with the other arm. Magnetic resonance images to assess T2 and cross-sectional area (CSA) of biceps brachii, brachialis, and brachioradialis, and measurements of maximal voluntary isometric contraction (MVC) torque, range of motion (ROM), and muscle soreness were taken before, immediately after, and 1, 3, and 5 days after each exercise...
December 2016: European Journal of Applied Physiology
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