Reflex adaptations during treadmill walking with increased body load
Reflex adaptations during treadmill walking with increased body load
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随着身体负荷增加，跑步机行走时的反射适应
DOI：
10.1007/s002210000628
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发表时间：
2001
影响因子：
2
通讯作者：
V. Dietz
中科院分区：
文献类型：
--
作者：
K. Fouad;C. M. Bastiaanse;V. Dietz
抽象的。在分带式跑步机上行走的健康受试者中研究了负载依赖性反射适应。在中间站立期间，右跑步机带的短暂加速会在右腿伸肌中引起代偿性反射反应。记录右腿内侧腓肠肌 (GMR)、比目鱼肌 (SO) 和胫骨前肌 (TA) 以及未受干扰腿腓肠肌 (GML) 的肌电活动 (EMG)。为了研究适应性反射行为，在正常（对照）和增加身体负荷的步行期间以及去除负荷后进行了多次测量。在大多数实验中，GMR 中的补偿性肌电图反应由短暂的抑制和随后的兴奋成分组成。当身体负载时，这两个反射成分都更大。在连续加载过程中，观察到受试者有不同程度和方向的发散性反射适应。在一组受试者中，反射反应增加到更高水平的肌电图活动。在第二组中，肌电图活动首先增加，然后降至基线水平。随后身体负荷的去除导致两组对控制反射值的缓慢适应。增加负荷后，两组的 GM 肌电图活动和 GMR 反射反应均没有发生不同的变化。我们的结果表明，负载信息不仅仅用于受试者实际生物力学条件的固定输入/输出关系。负载信息更确切地说是用来慢慢修改反射反应，以在行走过程中达到所需的姿势。
Abstract. Load dependent reflex adaptations were studied in healthy subjects walking on a split-belt treadmill. Compensatory reflex responses were elicited in the right leg extensor muscles during mid-stance by a short acceleration of the right treadmill belt. Electromyographic activity (EMG) was recorded from the right medial gastrocnemius (GMR), soleus (SO) and tibialis anterior (TA) muscles of the right leg as well as from the gastrocnemius of the left unperturbed leg (GML). To study the adaptational reflex behavior, multiple measurements were taken during walking with normal (control) and increased body load and after removing the load. In most experiments the compensatory EMG response in the GMR consisted of a short inhibitory and a subsequent excitatory component. Both reflex components were larger when the body was loaded. During the course of continuous loading, divergent reflex adaptations of different degrees and directions were observed in the subjects. In one group of subjects the reflex response increased to a higher level of EMG activity. In a second group EMG activity first increased and afterwards decreased to baseline level. A subsequent removal of body loading resulted in a slow adaptation to the control reflex values in both groups. Neither the EMG activity in the GM nor the reflex responses in the GMR after increasing the load changed differently in the two groups. Our results suggest that load information is not simply used in a fixed input/output relationship of the actual biomechanical conditions of a subject. Load information is rather used to slowly modify the reflex response, to achieve the desired posture during walking.
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影响因子：
3.3
作者：
R. Tsika;R. Herrick;K. Baldwin
通讯作者：
R. Tsika;R. Herrick;K. Baldwin
影响因子：
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作者：
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影响因子：
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作者：
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通讯作者：
Edgerton, VR
影响因子：
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作者：
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通讯作者：
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