Unexpected motor patterns for hindlimb muscles during slope walking in the cat.
Unexpected motor patterns for hindlimb muscles during slope walking in the cat.
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猫在斜坡行走时后肢肌肉的意外运动模式。
DOI：
10.1152/jn.1995.74.5.2211
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
Carlson-Kuhta,P
中科院分区：
文献类型：
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作者：
Smith,JL;Carlson-Kuhta,P
1. 研究人员通过高速电影评估猫的后肢运动学和运动模式，同时通过训练猫在四个等级（25、50、75和100%）的人行道上行走的肌电图（EMG）数据进行评估。2. 髋关节（髂腰肌）和踝关节（胫骨前肌）的屈肌在上下斜坡行走的摆动阶段具有相似的活动模式；在下坡行走时，两个屈肌也有与站立相关的活动，这是出乎意料的。髋关节伸肌（股前二头肌和前半膜肌）、膝关节[股外侧肌（VL）]和踝关节[腓骨外侧肌（LG）]在上坡行走的站立阶段是活跃的。下坡行走站立时，左、右脑活动持续时间减少，并以爪接触为中心。然而，在下坡行走时，髋关节伸肌完全不活动，这是意料之外的。3. 髋关节和踝关节的屈肌（不是伸肌）主导了下坡行走的站立阶段，尤其是在陡坡上。这种运动模式的转换可能需要平衡在下坡行走的站立阶段产生髋关节和踝关节伸展的外力。本文讨论了屈肌站立相关活动的神经机制。
1. Hindlimb kinematics and motor patterns were assessed from high-speed cine film synchronized with electromyographic (EMG) data from cats trained to walk on a walkway placed at four grades (25, 50, 75, and 100%). 2. Flexor muscles of the hip (iliopsoas) and ankle (tibialis anterior) had similar activity patterns for the swing phase of up- and down-slope walking; both flexor muscles also had stance-related activity during down-slope walking and this was unexpected. Extensor muscles of the hip (anterior biceps femoris and anterior semimembranosus), knee [vastus lateralis (VL)], and ankle [lateral gastrocnemius (LG)] were active during the stance phase of up-slope walking. The VL and LG activity was reduced in duration during stance of down-slope walking and centered around paw contact. Hip extensors, however, were totally inactive during stance of down-slope walking, and this was not expected. 3. Flexor muscles at the hip and ankle (not extensor muscles) dominated the stance phase of down-slope walking, especially at the steeper slopes. This switch in motor patterns may be required to counterbalance external forces that produced extension at the hip and ankle joints during the stance phase of down-slope walking. Neural mechanisms for programming stance-related activity of flexor muscles are discussed.