Harris D J
Undersea Biomed Res. 1979 Mar;6(1):55-74.
Sensitivity of the knee-jerk reflex was measured in three men during two experimental saturation dives, a fast compression dive to 300 msw and a slow compression dive to 420 msw. In all cases, the force produced at the ankle by the reflex (isometric) contraction was augmented after compression. The most marked increases were observed during the shallower but faster compression dive. During decompression, reflex sensitivity remained enhanced during the 300-m dive but returned to control levels during the 420-m dive. Furthermore, the usual facilitatory effects of Jendrassik's maneuver were abolished during the 300-m dive. Peripheral nerve conduction velocity and synaptic delay apparently remained unaffected. The conclusion that the observed hyper-reflexivity results from supra-spinal influence on alpha-motor-neuron excitability and possibly on gamma-efferent activity is discussed in relation to other reflex studies in hyperbaric O2-He and O2-N2 environments.
在两次实验性饱和潜水期间，对三名男性的膝跳反射敏感性进行了测量，一次是快速压缩潜水至300米海水深度，另一次是缓慢压缩潜水至420米海水深度。在所有情况下，反射（等长）收缩在脚踝处产生的力量在压缩后都会增强。在较浅但速度较快的压缩潜水中观察到最显著的增加。在减压过程中，300米潜水时反射敏感性仍然增强，但在420米潜水时恢复到对照水平。此外，在300米潜水期间，通常的Jendrassik手法的易化作用被消除。周围神经传导速度和突触延迟显然未受影响。结合在高压氧-氦和氧-氮环境中的其他反射研究，讨论了观察到的反射亢进是由脊髓以上对α运动神经元兴奋性以及可能对γ传出活动的影响所致这一结论。
