Hindlimb suspension inhibits air-righting due to altered recruitment of neck and back muscles in rats
Hindlimb suspension inhibits air-righting due to altered recruitment of neck and back muscles in rats
复制标题
DOI：
10.2170/jjphysiol.54.229
复制
发表时间：
2004-06-01
期刊：
影响因子：
--
通讯作者：
Ohira, Y
中科院分区：
文献类型：
--
作者：
Kawano, F;Wang, XD;Ohira, Y
Effects of 9-week hindlimb suspension and 8-week recovery on air-righting reaction in response to drop from a supine position were studied in adult rats. The righting time in rats at the end of suspension (similar to220 ms) was longer than the age-matched controls (similar to120 ms, p < 0.05). The unloading-related change in righting time was accompanied by lowered activities of electromyogram (EMG) and altered recruitment of both neck and back muscles at a specific stage of drop. After 8 weeks of reambulation, righting time recovered toward the control level (similar to153 ms, p < 0.05), but the EMG activity of back muscle was still less than controls. In contrast, the EMG of neck muscle during fall was even increased. The differences in the characteristics of the muscle fibers between two groups were minor. It is suggested that inhibition of recruitment, rather than the changes in the fiber characteristics, of neck and back muscles is one of the major causes of the slow air-righting.
