Multiscale hamstring muscle adaptations following 9 weeks of eccentric training.

IF 9.7 1区 医学 Q1 HOSPITALITY, LEISURE, SPORT & TOURISM Journal of Sport and Health Science Pub Date : 2024-10-16 DOI:10.1016/j.jshs.2024.100996
Max H Andrews, Anoosha Pai S, Reed D Gurchiek, Patricio A Pincheira, Akshay S Chaudhari, Paul W Hodges, Glen A Lichtwark, Scott L Delp
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Abstract

Background: Eccentric training, such as Nordic hamstring exercise (NHE) training, is commonly used as a preventive measure for hamstring strains. Eccentric training is believed to induce lengthening of muscle fascicles and to be associated with the addition of sarcomeres in series within muscle fibers. However, the difficulty in measuring sarcomere adaptation in human muscles has severely limited information about the precise mechanisms of adaptation. This study addressed this limitation by measuring the multiscale hamstring muscle adaptations in response to 9 weeks of NHE training and 3 weeks of detraining.

Methods: Twelve participants completed 9 weeks of supervised NHE training, followed by a 3-week detraining period. We assessed biceps femoris long-head (BFlh) muscle fascicle length, sarcomere length, and serial sarcomere number in the central and distal regions of the muscle. Additionally, we measured muscle volume and eccentric strength at baseline, post-training, and post-detraining.

Results: NHE training over 9 weeks induced significant architectural and strength adaptations in the BFlh muscle. Fascicle length increased by 19% in the central muscle region and 33% in the distal muscle region. NHE also induced increases in serial sarcomere number (25% in the central region and 49% in the distal region). BFlh muscle volume increased by 8%, and knee flexion strength increased by 40% with training. Following 3 weeks of detraining, fascicle length decreased by 12% in the central region and 16% in the distal region along with reductions in serial sarcomere number.

Conclusion: Nine weeks of NHE training produced substantial, region-specific increases in BFlh muscle fascicle length, muscle volume, and force generation. The direct measurement of sarcomere lengths revealed that the increased fascicle length was accompanied by the addition of sarcomeres in series within the muscle fascicles.

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9周偏心训练后腿筋肌肉的多尺度适应性。
背景:偏心训练,如北欧腿筋运动(NHE)训练,通常被用作腿筋拉伤的预防措施。偏心训练被认为可促使肌肉束延长,并与肌纤维内串联的肉肌增加有关。然而,由于难以测量人体肌肉中的肌节适应性,有关适应性精确机制的信息受到严重限制。本研究通过测量腿筋肌肉在接受 9 周 NHE 训练和 3 周脱离训练后的多尺度适应性,解决了这一局限性:方法:12 名参与者完成了为期 9 周的有指导的 NHE 训练,随后进行了为期 3 周的脱离训练。我们评估了股二头肌长头肌(BFlh)的肌束长度、肌节长度以及肌肉中央和远端区域的序列肌节数量。此外,我们还测量了基线、训练后和训练后的肌肉体积和偏心强度:结果:为期 9 周的 NHE 训练使 BFlh 肌肉的结构和力量发生了显著的适应性变化。中心肌肉区域的筋膜长度增加了 19%,远端肌肉区域的筋膜长度增加了 33%。NHE 还诱导了序列肌节数量的增加(中央区域增加 25%,远端区域增加 49%)。训练后,BFlh 肌肉体积增加了 8%,膝关节屈曲力量增加了 40%。经过 3 周的非训练后,中心区域的筋膜长度减少了 12%,远端区域的筋膜长度减少了 16%,同时序列肌节数量也减少了:结论:为期九周的 NHE 训练可显著增加 BFlh 肌束长度、肌肉体积和发力。对肌节长度的直接测量显示,随着筋束长度的增加,肌肉筋束内的串联肌节也随之增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
18.30
自引率
1.70%
发文量
101
审稿时长
22 weeks
期刊介绍: The Journal of Sport and Health Science (JSHS) is an international, multidisciplinary journal that aims to advance the fields of sport, exercise, physical activity, and health sciences. Published by Elsevier B.V. on behalf of Shanghai University of Sport, JSHS is dedicated to promoting original and impactful research, as well as topical reviews, editorials, opinions, and commentary papers. With a focus on physical and mental health, injury and disease prevention, traditional Chinese exercise, and human performance, JSHS offers a platform for scholars and researchers to share their findings and contribute to the advancement of these fields. Our journal is peer-reviewed, ensuring that all published works meet the highest academic standards. Supported by a carefully selected international editorial board, JSHS upholds impeccable integrity and provides an efficient publication platform. We invite submissions from scholars and researchers worldwide, and we are committed to disseminating insightful and influential research in the field of sport and health science.
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