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"Exercise induced muscle damage"

Daniel J Owens, Craig Twist, James N Cobley, Glyn Howatson, Graeme L Close
Exercise-induced muscle damage (EIMD) is characterized by symptoms that present both immediately and for up to 14 days after the initial exercise bout. The main consequence of EIMD for the athlete is the loss of skeletal muscle function and soreness. As such, numerous nutrients and functional foods have been examined for their potential to ameliorate the effects of EIMD and accelerate recovery, which is the purpose of many nutritional strategies for the athlete. However, the trade-off between recovery and adaptation is rarely considered...
August 15, 2018: European Journal of Sport Science
Luciano Ramos, Rodrigo Labat Marcos, Romildo Torres-Silva, Rodney Capp Pallota, Tatiana Magacho, Fernando Francisco Pazello Mafra, Michel Monteiro Macedo, Rodrigo Leal de Paiva Carvalho, Jan Magnus Bjordal, Rodrigo Alvaro B Lopes-Martins
BACKGROUND: Unusual and exhaustive physical exercise can lead to muscle lesions depending on the type of contraction, intensity, duration, age, and level of conditioning. Different therapies have been proposed to prevent or reduce exercise-induced muscle damage. In this study, we investigate the effects of low-level laser therapy on skeletal muscle strain in an experimental model in rats. MATERIALS AND METHODS: Male Wistar rats (200 g) were used. The animals were randomized into groups of six animals...
August 10, 2018: Photomedicine and Laser Surgery
Z Xia, J M Cholewa, D Dardevet, T Huang, Y Zhao, H Shang, Y Yang, X Ding, C Zhang, H Wang, S Liu, Q Su, N E Zanchi
The positive influence of animal-based protein supplementation during muscle-damaging exercise has been widely studied. However, the effects of plant-based proteins remain unclear and require further clarification. This study investigated the protective role of oat protein against exercise induced muscle damage (EIMD), subsequent inflammation, and loss of performance induced by downhill running. Subjects consumed either oat protein (25 g protein) or a placebo for 14 days prior to a downhill running test and then for 4 days thereafter...
August 10, 2018: Food & Function
Meghan A Brown, Emma J Stevenson, Glyn Howatson
Tart Montmorency cherry concentrate (MC) has been reported to attenuate the symptoms of exercise-induced muscle damage (EIMD) and to accelerate exercise recovery, which has been attributed to its high anti-inflammatory and antioxidant properties. Although these data are promising, there are no data regarding exclusively female populations. Therefore, the aim of this investigation was to examine the efficacy of MC on recovery following EIMD in females. In a randomised, double-blind, placebo-controlled study, twenty physically active females (mean ± SD age 19 ± 1 y; stature 167 ± 6 cm; body mass 61...
July 28, 2018: European Journal of Sport Science
Hyun-Jun Jang, Jung Dae Lee, Hyun-Sik Jeon, Ah-Ram Kim, Suhkmann Kim, Ho-Seong Lee, Kyu-Bong Kim
Skeletal muscle can be ultrastructurally damaged by eccentric exercise, and the damage causes metabolic disruption in muscle. This study aimed to determine changes in the metabolomic patterns in urine and metabolomic markers in muscle damage after eccentric exercise. Five men and 6 women aged 19~23 years performed 30 min of the bench step exercise at 70 steps per min at a determined step height of 110% of the lower leg length, and stepping frequency at 15 cycles per min. 1 H NMR spectral analysis was performed in urine collected from all participants before and after eccentric exercise-induced muscle damage conventionally determined using a visual analogue scale (VAS) and maximal voluntary contraction (MVC)...
July 2018: Toxicological Research
Angelina Freitas Siqueira, Amilton Vieira, Martim Bottaro, João Batista Ferreira-Júnior, Otávio de Toledo Nóbrega, Vinícius Carolino de Souza, Rita de Cássia Marqueti, Nicolas Babault, João Luiz Quagliotti Durigan
The aim of this study was to investigate the effects of multiple cold-water immersions (CWIs) on muscle function, markers of muscle damage, systemic inflammation and ECM degradation following exercise-induced muscle damage (EIMD). Thirty physically active males were randomly assigned to either a control (n = 15) or cold-water immersion (CWI) group (n = 15). The CWI group performed one immersion (10 °C for 20 min) at post-exercise and every 24 h for the following 72 h, while the control group remained in a seated position during these corresponding periods...
July 19, 2018: Scientific Reports
Andreas Venhorst, Dominic P Micklewright, Timothy D Noakes
BACKGROUND: Locomotor muscle fatigue (LMMF) and exercise-induced muscle damage (EIMD) are common conditions experienced during long-distance running due to the pooled effect of mechanical and metabolic strain on the locomotor muscles. However, little is known about the instant effects of combined LMMF and EIMD on pacing behaviour and performance during the decisive final stages of 'real-world' long-distance running events. METHODS: Twenty-two highly trained runners (11 females) completed two maximal self-paced 20-km treadmill time trials in a counterbalanced crossover design: (A) in a tapered condition and (B) with LMMF and EIMD...
July 10, 2018: Sports Medicine—Open
Andreas Venhorst, Dominic P Micklewright, Timothy D Noakes
BACKGROUND: "Hitting the wall" (HTW) can be understood as a psychophysiological stress process characterised by (A) discrete and poignant onset, (B) dynamic interplay between physiological, affective, motivational, cognitive, and behavioural systems, and (C) unintended alteration of pace and performance. A preceding companion article investigated the psychophysiological responses to 20-km self-paced treadmill time trials after producing exercise-induced muscle damage (EIMD) via a standardised muscle-lengthening contraction protocol...
July 10, 2018: Sports Medicine—Open
Katherine Elizabeth Black, Oliver C Witard, Dane Baker, Philip Healey, Victoria Lewis, Francisco Tavares, Sam Christensen, Tom Pease, Brett Smith
Evidence suggests that omega-3 fatty acid supplementation could reduce muscle soreness and maintain muscle function following eccentric exercise-induced muscle damage. The aim of this applied field study was to investigate the effectiveness of consuming a protein-based supplement containing 1546 mg of omega-3 polyunsaturated fatty acid (PUFA) (551 mg eicosapentaenoic acid (EPA) and 551 mg docosahexaenoic acid (DHA)) twice daily (FO) compared to a protein-based placebo (P) on muscle soreness, countermovement jump (CMJ) performance and psychological well-being in 20 professional Rugby Union players during 5 weeks of pre-season training...
July 9, 2018: European Journal of Sport Science
Pedro L Valenzuela, Zigor Montalvo, Elaia Torrontegi, Guillermo Sánchez-Martínez, Alejandro Lucia, Pedro de la Villa
OBJECTIVE: To analyze the effectiveness of enhanced external counterpulsation (EECP) on recovery from exercise-induced muscle damage (EIMD). DESIGN: This study followed a crossover, placebo-controlled, counterbalanced design. PARTICIPANTS: Ten healthy active subjects (7 male; 27 ± 4 years). INTERVENTIONS: Participants performed a plyometric exercise bout (10 sets of 10 jumps interspersed with 1-minute rests) and were then assigned to recover for 30 minutes with either EECP (cuff pressure = 80 mm Hg) or a Sham intervention (0 mm Hg) immediately after exercise and at 24 hours after exercise...
June 26, 2018: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
Anthony David Kay, Bethanee Rubley, Chris Talbot, Minas Mina, Anthony William Baross, Anthony John Blazevich
INTRODUCTION: Stretching highly-contracted plantar flexor muscles (isokinetic eccentric contractions) results in beneficial adaptations in muscle strain risk factors; however its effects in other muscle groups, and on architectural characteristics and exercise-induced muscle damage (EIMD), are unknown. METHODS: The influence of a 6-week knee extensor training program was studied in 26 volunteers (13 control; 13 experimental). Before and after the training program, passive and maximal isometric and eccentric knee extensor moments and range of motion (ROM) were recorded on an isokinetic dynamometer with simultaneous ultrasound imaging of vastus lateralis (VL)...
June 26, 2018: Scandinavian Journal of Medicine & Science in Sports
Lenice Kappes Becker, Nádia Totou, Samara Moura, Lucas Kangussu, Ruben Dario Sinisterra Millán, Maria Jose Campagnole-Santos, Daniel Coelho, Daisy Motta-Santos, Robson Augusto Souza Santos
The development of new strategies to attenuate exercise-induced muscle damage may be helpful for training regimens. The aim of this study was to determine whether a oral formulation of angiotensin Ang-(1-7)[HPβCD/Ang-(1-7)] is effective to reduce pain, and muscle damage markers after eccentric-overload exercise. HPβCD (Placebo) and HPβCD/Ang-(1-7) (Ang-(1-7) group were treated for 7 days (one capsule/day). The pain was measured by visual analogue scale, maximal strength (MS) using force platform. Blood samples were collected for cytokines and creatine kinase (CK) analysis...
June 25, 2018: International Journal of Sports Medicine
Andrew David Govus, Erik Petrus Andersson, Oliver Michael Shannon, Holly Provis, Mathilda Karlsson, Kerry McGawley
This study investigated whether commercially available compression garments (COMP) exerting a moderate level of pressure and/or neuromuscular electrical stimulation (NMES) accelerate recovery following a cross-country sprint skiing competition compared with a control group (CON) consisting of active recovery only. Twenty-one senior (12 males, 9 females) and 11 junior (6 males, 5 females) Swedish national team skiers performed an outdoor sprint skiing competition involving four sprints lasting ∼3-4 min. Before the competition, skiers were matched by sex and skiing level (senior versus junior) and randomly assigned to COMP (n = 11), NMES (n = 11) or CON (n = 10)...
June 20, 2018: European Journal of Sport Science
Amanda M Brandt, Joanna M Kania, Madison L Gonzalez, Sally E Johnson
Hepatocyte growth factor (HGF) signals mediate mouse skeletal muscle stem cell, or satellite cell (SC), reentry into the cell cycle and myoblast proliferation. Because the athletic horse experiences exercise-induced muscle damage, the objective of the experiment was to determine the effect of HGF on equine SC (eqSC) bioactivity. Fresh isolates of adult eqSC were incubated with increasing concentrations of HGF and the initial time to DNA synthesis was measured. Media supplementation with HGF did not shorten (P > 0...
June 16, 2018: Journal of Animal Science
Rafael Heiss, Marion Kellermann, Bernd Swoboda, Casper Grim, Christoph Lutter, Matthias S May, Wolfgang Wuest, Michael Uder, Armin M Nagel, Thilo Hotfiel
Study Design Controlled laboratory study with repeated measures. Background Delayed-onset muscle soreness (DOMS) is one of the most common reasons for impaired muscle performance in sports. However, little consensus exists regarding which treatments may be most effective and the underlying mechanisms are poorly understood. Objectives To investigate the influence of compression garments on the development of DOMS, focusing on changes in muscle perfusion and muscle stiffness. Methods Muscle perfusion and stiffness, calf circumference, muscle soreness, passive ankle dorsiflexion, and creatine kinase levels were assessed on participants before (baseline) a DOMS-inducing eccentric calf exercise intervention and 60 h later (follow-up)...
June 12, 2018: Journal of Orthopaedic and Sports Physical Therapy
Trevor C Chen, Ming-Ju Lin, Jian-Han Lai, Hsin-Lian Chen, Hui-I Yu, Kazunori Nosaka
OBJECTIVES: The magnitude of muscle damage induced by maximal eccentric contractions (MaxEC) of the elbow flexors (EF) is reduced when it is preceded by low-intensity (10% of maximal voluntary isometric contraction strength) eccentric contractions (10%EC) of the same muscle, or by MaxEC of the opposite EF. This study investigated whether 10%EC would reduce the magnitude of muscle damage after MaxEC performed by the opposite arm. DESIGN: Comparison among 6 groups for changes in indirect markers of muscle damage...
December 29, 2017: Journal of Science and Medicine in Sport
Philipp Baumert, Claire E Stewart, Mark J Lake, Barry Drust, Robert M Erskine
We investigated whether single nucleotide polymorphisms (SNPs) within genes encoding the alpha-1 chain of type I (COL1A1, rs2249492; rs1800012), type II (COL2A1, rs2070739) and type V (COL5A1, rs12722) collagen were associated with the variable response to exercise-induced muscle damage (EIMD). Knee extensor muscle strength and soreness were assessed pre-, post-, and 48h post-EIMD (120 maximal eccentric knee extensor contractions) in 65 young healthy participants, who were genotyped for the aforementioned SNPs...
May 25, 2018: Physiological Genomics
P A Pincheira, B W Hoffman, A G Cresswell, T J Carroll, N A T Brown, G A Lichtwark
Changes in muscle fascicle mechanics have been postulated to underpin the repeated bout effect (RBE) observed following exercise-induced muscle damage (EIMD). However, in the medial gastrocnemius (MG), mixed evidence exists on whether fascicle stretch amplitude influences the level of EIMD, thus questioning whether changes in fascicle mechanics underpin the RBE. An alternative hypothesis is that neural adaptations contribute to the RBE in this muscle. The aim of this study was to investigate the neuromechanical adaptations during and after repeated bouts of a highly controlled muscle lengthening exercise that aimed to maximize EIMD in MG...
May 23, 2018: Scandinavian Journal of Medicine & Science in Sports
Leonardo C R Lima, Natália M Bassan, Adalgiso C Cardozo, Mauro Gonçalves, Camila C Greco, Benedito S Denadai
Running economy (RE) is impaired following unaccustomed eccentric-biased exercises that induce muscle damage. It is also known that muscle damage is reduced when maximal voluntary isometric contractions (MVIC) are performed at a long muscle length 2-4 days prior to maximal eccentric exercise with the same muscle, a phenomenon that can be described as isometric pre-conditioning (IPC). We tested the hypothesis that IPC could attenuate muscle damage and changes in RE following downhill running. Thirty untrained men were randomly assigned into experimental or control groups and ran downhill on a treadmill (-15%) for 30 min...
August 2018: Human Movement Science
Anthony Lynn, Samantha Garner, Nichola Nelson, Trevor N Simper, Anna C Hall, Mayur K Ranchordas
Background: Emerging evidence indicates that fruits rich in polyphenols may attenuate exercise-induced muscle damage and associated markers of inflammation and soreness. This study was conducted to determine whether bilberry juice (BJ), which is particularly rich in polyphenols, reduces markers of muscle damage in runners completing a half marathon. Methods: A total of 21 recreationally trained runners (age 30.9 ± 10.4 y; mass 71.6 ± 11.0 kg; M = 16; F = 5) were recruited to a single blind, randomised, placebo-controlled, parallel study...
2018: Journal of the International Society of Sports Nutrition
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