Change in length of relaxed muscle fascicles and tendons with knee and ankle movement in humans
Change in length of relaxed muscle fascicles and tendons with knee and ankle movement in humans
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DOI：
10.1113/jphysiol.2001.012756
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发表时间：
2002-03-01
影响因子：
5.5
通讯作者：
Gandevia, SC
中科院分区：
文献类型：
--
作者：
Herbert, RD;Moseley, AM;Gandevia, SC
超声检查用于测量在被动施加关节角度变化时，人体放松状态下胫骨前肌和腓肠肌的肌束长度变化。将肌束长度的变化与根据关节角度和人体测量数据计算得出的整个肌腱单元长度的变化进行比较。放松状态下的肌束长度变化远小于其肌腱单元的长度变化。平均而言，胫骨前肌的肌束 “感知” 到的肌腱总长度变化为55 ± 13%（平均值 ± 标准差）。这表明肌腱总长度变化中近一半是由肌腱拉伸所致。在肌腱相对较长的腓肠肌中，肌腱总长度变化中只有27 ± 9% 传递到了肌束。因此，腓肠肌中被动运动由肌腱承担的趋势比胫骨前肌更强（P = 0.002）。对于这些肌肉而言，在肌腱长度的大部分生理范围内，肌腱长度发生的较大变化，无法完全用肌腱松弛、纤维羽状角变化或肌肉的拉伸或收缩历史来解释。我们的数据证实，当关节被动运动时，肌束 “感知” 到的长度变化可能远小于肌肉起止点之间距离的变化。出现这种情况是因为即使在极低的力作用下，肌腱也会发生显著的长度变化。
Ultrasonography was used to measure changes in length of muscle fascicles in relaxed human tibialis anterior and gastrocnemius during passively imposed changes in joint angle. Changes in the length of muscle fascicles were compared to changes in the length of the whole muscle-tendon units calculated from joint angles and anthropometric data. Relaxed muscle fascicles underwent much smaller changes in length than their muscle-tendon units. On average, muscle fascicles in tibialis anterior 'saw' 55 +/- 13 % (mean +/- S.D.) of the total change in muscle-tendon length. This indicates nearly half of the total change in muscle-tendon length was taken up by stretch of tendon. In gastrocnemius, which has relatively long tendons, only 27 9 % of the total change in muscle-tendon length was transmitted to muscle fascicles. Thus, the tendency for passive movement to be taken up by the tendon was greater for gastrocnemius than tibialis anterior (P = 0.002). For these muscles, the relatively large changes in tendon length across much of the physiological range of muscle-tendon lengths could not wholly be explained by tendon slackness, changes in fibre pennation, or stretch or contraction history of the muscle. Our data confirm that when joints are moved passively, length changes 'seen' by muscle fascicles can be much less than changes in the distance between muscle origin and insertion. This occurs because tendons undergo significant changes in length, even at very low forces.