持续的亚极限等长腕关节屈伸收缩会独特地损害拮抗腕关节动作的最大自主收缩力。

IF 1.6 3区 心理学 Q4 NEUROSCIENCES Human Movement Science Pub Date : 2024-08-12 DOI:10.1016/j.humov.2024.103269
Jeff S. Schrattner, David H. Imeson, Davis A. Forman
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引用次数: 0

摘要

腕伸肌是腕部的主要稳定器,当其疲劳时,腕伸肌对上肢远端运动能力的影响与腕屈肌疲劳时的影响惊人地相似。可能是腕伸肌作为拮抗剂非常活跃,以至于在腕关节屈曲收缩时也会产生同等程度的疲劳,因此很难真正分离出它们对运动表现的影响。因此,本研究的目的是考察激动剂或拮抗剂持续亚最大腕部收缩后,腕部屈伸力如何受到影响。13 名男性参与者参加了四节实验课。在这些训练中,通过腕关节屈伸的持续亚极限等长收缩来诱发疲劳。这些收缩持续时间长达 10 分钟,收缩力为参与者基线最大自主收缩力(MVC)的 20%。在整个持续收缩过程中,进行间歇性激动(与持续收缩相匹配)或拮抗(与持续收缩相反)MVC。不出所料,激动剂 MVC 力的下降幅度明显大于拮抗剂(激动剂:MVC 的 58.5%,拮抗剂:MVC 的 86.5%,P<0.05)。
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Sustained submaximal isometric wrist flexion and wrist extension contractions uniquely impair maximal voluntary contraction force in the antagonist wrist action

When fatigued, the wrist extensors, which are the primary wrist stabilizers, impair distal upper limb motor performance in a surprisingly similar way as when fatiguing the wrist flexors. It is possible that the wrist extensors are so active as antagonists that they develop an equal degree of fatigue during wrist flexion contractions, making it difficult to truly isolate their impact on performance. Thus, the purpose of this study was to examine how wrist flexion/extension forces are impaired following either agonist or antagonist sustained submaximal wrist contractions. 13 male participants attended four laboratory sessions. In these sessions, fatigue was induced via a sustained submaximal isometric contraction of either wrist flexion or extension. These contractions were held for up to 10 min at 20% of the participant's baseline maximal voluntary contraction (MVC) force. Throughout the sustained contraction, intermittent agonist (matching the sustained contraction) or antagonist (opposing the sustained contraction) MVCs were performed. Unsurprisingly, agonist MVC forces decreased significantly more than antagonist (Agonist: 58.5%, Antagonist: 86.5% of MVC, P < 0.001). However, while there were no differences in antagonist wrist extension and flexion MVC decreases (Wrist Flexion: 87.5%, Wrist Extension: 85.5%, P = 0.41), wrist extension MVCs did decrease significantly more than wrist flexion MVCs when forces were expressed relative to the agonist (P = 0.036). These findings partially support the hypothesis that the wrist extensors may be more susceptible to developing fatigue when functioning as antagonists than the wrist flexors. This work will help equip future research into the motor control of the upper limb and the prevention of forearm-related musculoskeletal disorders.

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来源期刊
Human Movement Science
Human Movement Science 医学-神经科学
CiteScore
3.80
自引率
4.80%
发文量
89
审稿时长
42 days
期刊介绍: Human Movement Science provides a medium for publishing disciplinary and multidisciplinary studies on human movement. It brings together psychological, biomechanical and neurophysiological research on the control, organization and learning of human movement, including the perceptual support of movement. The overarching goal of the journal is to publish articles that help advance theoretical understanding of the control and organization of human movement, as well as changes therein as a function of development, learning and rehabilitation. The nature of the research reported may vary from fundamental theoretical or empirical studies to more applied studies in the fields of, for example, sport, dance and rehabilitation with the proviso that all studies have a distinct theoretical bearing. Also, reviews and meta-studies advancing the understanding of human movement are welcome. These aims and scope imply that purely descriptive studies are not acceptable, while methodological articles are only acceptable if the methodology in question opens up new vistas in understanding the control and organization of human movement. The same holds for articles on exercise physiology, which in general are not supported, unless they speak to the control and organization of human movement. In general, it is required that the theoretical message of articles published in Human Movement Science is, to a certain extent, innovative and not dismissible as just "more of the same."
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