新型抗荷裤返回状态下神经–肌肉活动影响研究

The Neuromuscular Effects of New Anti-G Suit under Reentry Posture

摘要: 针对返回座椅工况，研究了新型抗荷裤在返回坐位下对神经–肌肉活动的影响。急性实验中5名受试者在平卧位、返回坐位、着抗荷裤平卧位、着抗荷裤返回坐位下检测了腓总神经(CPN)节段性运动神经传导；慢性实验中2名受试者分别在返回坐位下着抗荷裤4小时，定时检测了节段性运动神经传导。研究发现：着抗荷裤后，返回坐位相比于平卧位CPN踝复合肌肉动作电位(CMAP)波幅降低13.4 ± 3.1%且潜伏期缩短；相比于不着服，返回坐位着服后腓骨头CMAP波幅升高7.8 ± 1.3%。返回坐位下着抗荷裤2小时，CPN远端和近端CMAP波幅分别降低28.0%和45.4%，4小时后降低增加至78.2%和75.2%，但小腿和足部主动运动可缓解不适。返回坐位下长时着抗荷裤CPN远端和近端CMAP波幅降低，主动运动有利于耐受。

Abstract: To simulate reentry scenario, the neuromuscular control was studied under reentry posture with and without new anti-g suit. In the short-term experiment, five subjects adapted to the supine or reentry posture and with or without anti-g suit. Then segment motor nerve conduction of common peroneal nerve (CPN) was tested. In the long-term experiment, two subjects sat in the reentry chair wearing anti-g suit for 4 hours. And the CPN motor nerve conduction was monitored periodically. Wearing anti-g suit, the amplitudes of ankle compound muscle action potential (CMAP) under reentry posture were 13.4 ± 3.1% lower than that under supine and had shorter latencies. Under reentry posture, wearing anti-g suit increased the amplitudes of head of fibula CMAP by 7.8 ± 1.3%. After sitting in the reentry chair with anti-g suit for 2 hours, the amplitudes of the distal and proximal CMAP decreased by 28.0% and 45.4%. And the drop increased to 78.2% and 75.2% after 4 hours. The discomfort can be relieved by active calf and foot movements. Long lasting sitting in the reentry chair with anti-g suit induced the decrease of distal and proximal CAMP amplitudes. Periodic active movements benefitted for the tolerance.