Muscle damage after low-intensity eccentric contractions with blood flow restriction.

R S Thiebaud, J P Loenneke, C A Fahs, D Kim, X Ye, T Abe, K Nosaka, M G Bemben
{"title":"Muscle damage after low-intensity eccentric contractions with blood flow restriction.","authors":"R S Thiebaud,&nbsp;J P Loenneke,&nbsp;C A Fahs,&nbsp;D Kim,&nbsp;X Ye,&nbsp;T Abe,&nbsp;K Nosaka,&nbsp;M G Bemben","doi":"10.1556/APhysiol.101.2014.2.3","DOIUrl":null,"url":null,"abstract":"<p><p>Discrepancies exist whether blood flow restriction (BFR) exacerbates exercise-induced muscle damage (EIMD). This study compared low-intensity eccentric contractions of the elbow flexors with and without BFR for changes in indirect markers of muscle damage. Nine untrained young men (18-26 y) performed low-intensity (30% 1RM) eccentric contractions (2-s) of the elbow flexors with one arm assigned to BFR and the other arm without BFR. EIMD markers of maximum voluntary isometric contraction (MVC) torque, range of motion (ROM), upper arm circumference, muscle thickness and muscle soreness were measured before, immediately after, 1, 2, 3, and 4 days after exercise. Electromyography (EMG) amplitude of the biceps brachii and brachioradialis were recorded during exercise. EMG amplitude was not significantly different between arms and did not significantly change from set 1 to set 4 for the biceps brachii but increased for the brachioradialis (p ≤ 0.05, 12.0% to 14.5%) when the conditions were combined. No significant differences in the changes in any variables were found between arms. MVC torque decreased 7% immediately post-exercise (p ≤ 0.05), but no significant changes in ROM, circumference, muscle thickness and muscle soreness were found. These results show that BFR does not affect EIMD by low-intensity eccentric contractions. </p>","PeriodicalId":7167,"journal":{"name":"Acta physiologica Hungarica","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2014-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1556/APhysiol.101.2014.2.3","citationCount":"35","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Acta physiologica Hungarica","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1556/APhysiol.101.2014.2.3","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 35

Abstract

Discrepancies exist whether blood flow restriction (BFR) exacerbates exercise-induced muscle damage (EIMD). This study compared low-intensity eccentric contractions of the elbow flexors with and without BFR for changes in indirect markers of muscle damage. Nine untrained young men (18-26 y) performed low-intensity (30% 1RM) eccentric contractions (2-s) of the elbow flexors with one arm assigned to BFR and the other arm without BFR. EIMD markers of maximum voluntary isometric contraction (MVC) torque, range of motion (ROM), upper arm circumference, muscle thickness and muscle soreness were measured before, immediately after, 1, 2, 3, and 4 days after exercise. Electromyography (EMG) amplitude of the biceps brachii and brachioradialis were recorded during exercise. EMG amplitude was not significantly different between arms and did not significantly change from set 1 to set 4 for the biceps brachii but increased for the brachioradialis (p ≤ 0.05, 12.0% to 14.5%) when the conditions were combined. No significant differences in the changes in any variables were found between arms. MVC torque decreased 7% immediately post-exercise (p ≤ 0.05), but no significant changes in ROM, circumference, muscle thickness and muscle soreness were found. These results show that BFR does not affect EIMD by low-intensity eccentric contractions.

低强度偏心收缩伴血流受限后的肌肉损伤。
血流量限制(BFR)是否会加剧运动引起的肌肉损伤(EIMD)存在差异。这项研究比较了有和没有BFR的肘关节屈肌的低强度偏心收缩对肌肉损伤的间接标志的变化。9名未经训练的年轻男性(18-26岁)进行了低强度(30% 1RM)肘屈肌偏心收缩(2-s),其中一只手臂进行BFR,另一只手臂未进行BFR。在运动前、运动后立即、运动后1、2、3和4天测量最大自主等距收缩(MVC)扭矩、运动范围(ROM)、上臂围、肌肉厚度和肌肉酸痛的EIMD指标。记录运动时肱二头肌和肱桡肌的肌电波幅。两组间肌电波幅差异不显著,从组1到组4,肱二头肌的肌电波幅变化不显著,而肱桡肌的肌电波幅增加(p≤0.05,12.0% ~ 14.5%)。在两组之间没有发现任何变量变化的显著差异。运动后MVC扭矩立即下降7% (p≤0.05),但ROM、周长、肌肉厚度和肌肉酸痛无显著变化。这些结果表明,BFR不影响EIMD的低强度偏心收缩。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
Acta physiologica Hungarica
Acta physiologica Hungarica 医学-生理学
自引率
0.00%
发文量
0
审稿时长
6.0 months
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信