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首页> 外文期刊>Journal of Biomechanics >The shape of the force-elbow angle relationship for maximal voluntary contractions and sub-maximal electrically induced contractions in human elbow flexors.
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The shape of the force-elbow angle relationship for maximal voluntary contractions and sub-maximal electrically induced contractions in human elbow flexors.

机译：人肘屈肌中最大自愿收缩和次最大电诱发收缩的力-肘角度关系的形状。

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摘要

The force-length relationship is a basic property of skeletal muscle. Knowledge of this relationship is necessary for most analyses of human movement, and in simulation models predicting movement control strategies. Studies on animal muscles have shown that force-length relationships for sub-maximal contractions are not related through a simple scaling procedure to the relationship for maximal contractions. Furthermore, potentiation might produce a shift of sub-maximal relative to maximal force-length relationships. In this study, we tested the hypothesis that human force-elbow angle relationships for sub-maximal unpotentiated contractions are shifted to larger elbow angles (i.e. larger muscle lengths) compared to the relationship for maximal voluntary contractions (MVC), and that this shift is reduced, or even abolished, for sub-maximal potentiated contractions. Force-elbow angle relationships (48-160 degrees ) were obtained from healthy subjects (n=13). At each of nine tested elbow angles, the test set consisted of a single twitch (ST(pre)) and a doublet twitch (DT(pre)) stimulation of m. biceps brachii, followed by an MVC, followed by another single twitch (ST(post)) and a doublet twitch (DT(post)) stimulation. The single and doublet twitches induced sub-maximal contractions. The force-elbow angle relationships for the pre-MVC (unpotentiated) twitch contractions were shifted to larger angles compared to those obtained for MVC. The force-elbow angle relationships for the post-MVC (potentiated) twitch contractions were shifted to smaller angles compared to those obtained for the unpotentiated twitch contractions. These results support the idea that the shift to larger muscle lengths for the sub-maximal, unpotentiated force-length relationships relative to the relationship for maximal contractions may be caused by a length-dependent Ca(2+) sensitivity that may be offset, at least in part, by potentiation.
机译：力长关系是骨骼肌的基本属性。对于大多数人体运动分析以及在预测运动控制策略的仿真模型中，必须具有这种关系的知识。对动物肌肉的研究表明，次最大收缩的力长关系通过简单的缩放程序与最大收缩的关系无关。此外，增强可能会产生相对于最大力长关系的次最大位移。在这项研究中，我们测试了以下假设：与最大自愿收缩（MVC）的关系相比，次最大无力收缩的人的力-肘角度关系会移动到更大的肘角（即，更大的肌肉长度），并且减少或什至取消亚最大增强收缩。从健康受试者（n = 13）获得力肘角度关系（48-160度）。在九个测试的肘角度中的每个角度，测试集均包含一个m的单次抽动（ST（pre））和一个双态抽动（DT（pre））刺激。肱二头肌，然后是MVC，然后是另一个单次抽搐（ST（post））和双重抽搐（DT（post））刺激。单发和双发抽搐引起次最大收缩。与MVC相比，MVC之前（未增强）的抽搐收缩的力肘角度关系移动到更大的角度。与未增强的抽搐收缩相比，MVC后（增强的）抽搐收缩的力肘角度关系移到了较小的角度。这些结果支持这样的想法，即相对于最大收缩的关系，相对于最大收缩的关系而言，亚最大，未增强的力-长度关系向较大肌肉长度的转移可能是由与长度相关的Ca（2+）敏感性引起的，在至少部分是通过增强作用。

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