The isometric functional capacity of muscles that cross the elbow
The isometric functional capacity of muscles that cross the elbow
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DOI：
10.1016/s0021-9290(00)00051-8
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发表时间：
2000-08-01
影响因子：
2.4
通讯作者：
Delp, SL
中科院分区：
文献类型：
--
作者：
Murray, WM;Buchanan, TS;Delp, SL
我们假设，横跨肘部的肌肉由于它们的结构、力矩臂以及它们的结构和力矩臂的组合的不同，在它们的漂移、力产生和力矩产生的能力上有根本的不同。测量了10具上肢标本肘部主要肌群的肌束长度、肌节长度、肘角、质量和屈肘时的肌腱移位。根据这些数据估计最佳肌束长度、生理横截面积(PCSA)、力臂、力长曲线上的工作范围和力矩产生能力。腕尺肌束最长(17.7 cm)，旋前圆肌最短(5.5 cm)。其中，肱三头肌(组合头)最大(14.9 cm(2))，肱二头肌最小(1.2 cm(2))。尽管有类似的束状物长度，但很长。与长头肌(长度变化=最佳长度的28%，12.7 cm)相比，肱二头肌的力长曲线(长度变化=最佳长度的56%，12.8 cm)的范围更宽，因为它的力矩臂较大(4.7 cm对2.3 cm)。虽然腕尺肌的PCSA较小，但由于其较大的力矩臂(平均峰值为7.7厘米)，因此具有相对较大的瞬间产生能力(6.8 cm(3))。这些结果强调，在评估肌肉的功能能力时，需要考虑结构和力矩臂的相互作用。(C)2000爱思唯尔科学有限公司。保留所有权利。
We hypothesized that muscles crossing the elbow have fundamental differences in their capacity for excursion, force generation, and moment generation due to differences in their architecture, moment arm, and the combination of their architecture and moment arm. Muscle fascicle length, sarcomere length, pennation angle, mass, and tendon displacement with elbow flexion were measured for the major elbow muscles in 10 upper extremity specimens. Optimal fascicle length, physiological cross-sectional area (PCSA), moment arm, operating range on the force-length curve, and moment-generating capacity were estimated from these data. Brachioradialis and pronator teres had the longest (17.7 cm) and shortest (5.5 cm) fascicles, respectively. Triceps brachii (combined heads) and brachioradialis had the greatest (14.9 cm(2)) and smallest (1.2 cm(2)) PCSAs, respectively. Despite a comparable fascicle length, long. head of biceps brachii operates over a broader range of the force-length curve (length change = 56% of optimal length, 12.8 cm) than the long head of triceps brachii (length change = 28% of optimal length, 12.7 cm) because of its larger moment arm (4.7 cm vs. 2.3 cm). Although brachioradialis has a small PCSA, it has a relatively large moment-generating capacity (6.8 cm(3)) due to its large moment arm (average peak = 7.7 cm). These results emphasize the need to consider the interplay of architecture and moment arm when evaluating the functional capabilities of a muscle. (C) 2000 Elsevier Science Ltd. All rights reserved.