ARCHITECTURE OF THE HINDLIMB MUSCLES OF CATS - FUNCTIONAL-SIGNIFICANCE
ARCHITECTURE OF THE HINDLIMB MUSCLES OF CATS - FUNCTIONAL-SIGNIFICANCE
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DOI：
10.1002/jmor.1051730206
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发表时间：
1982-01-01
影响因子：
1.5
通讯作者：
ROY, RR
中科院分区：
文献类型：
--
作者：
SACKS, RD;ROY, RR
肌肉的力、速度和位移特性在很大程度上取决于其结构设计。通过测定24只猫后肢肌肉的肌重、肌纤维长度、平均肌节长度和羽状突起的近似角度，研究了肌肉结构对这些生理变量的相对影响。肌肉长度范围从28.3-144毫米;纤维长度范围从8.4-105.5毫米。纤维肌肉长度比是相似的整个肌肉。估计的肌纤维羽状角为0 - 21 °。大多数具有<10 °的角度。膝伸肌的横截面积与膝屈肌相似（16.43与16.83 cm 2）;踝伸肌的横截面积是踝屈肌的6倍以上（18.59与2.83 cm 2）。当归一化为恒定重量时，肌肉之间的最大力存在6.7倍的差异，这可能归因于结构特征。计算每个肌肉和肌肉群的湿重与预测最大强直张力的比率，以比较给定肌肉质量的肌肉力与肌肉长度-速度的相对优先级。这些比率从0.4-4.84不等。比率表明，速度和/或位移是腿筋的优先级;力量是股四头肌和小腿肌肉的优先级。肌肉之间的最大速度差异高达12.6倍，这可以归因于纤维长度的差异。这可以与. apprx进行比较。据报道，由于生物化学（内在）差异，最大速度存在2.5倍的差异。
Force, velocity, and displacement properties of a muscle was determined in large part by its architectural design. The relative effect of muscle architecture on these physiological variables was studied by determining muscle weight, fiber length, average sarcomere length and approximate angle of pinnation for 24 cat hind limb muscles. Muscle lengths ranged from 28.3-144 mm; fiber lengths ranged from 8.4-105.5 mm. Fiber to muscle length ratios were similar throughout a muscle. Estimated angles of pinnation of muscle fibers varied from 0-21.degree. with most having an angle of < 10.degree.. The cross-sectional area of the knee extensors was similar to the knee flexors (16.43 vs. 16.83 cm2); the cross-sectional area of the ankle extensors was > 6 times greater than the ankle flexors (18.59 vs. 2.83 cm2). There was a 6.7-fold difference in the maximal force between muscles, when normalized to a constant weight, that could be attributed to architectural features. Ratios of wet weight to predicted maximal tetanic tension for each muscle and muscle group were calculated to compare the relative priority of muscle force vs. muscle length-velocity for a given mass of muscle. These ratios varied from 0.4-4.84. The ratios suggest that velocity and/or displacement is a priority for the hamstrings; force is a priority for the quadriceps and lower leg muscles. As much as a 12.6-fold difference in maximal velocity between muscles can be attributed to differences in fiber lengths. This can be compared to .apprx. a 2.5-fold difference in maximal velocity reported to occur as a result of biochemical (intrinsic) differences.