Schmeling W T, Forster H V, Hosko M J
Aviat Space Environ Med. 1977 Nov;48(11):1039-45.
Studies of the H reflex and the Achilles tendon reflex (ATR) were performed in 12 healthy males under six conditions: 1) sea level control, 2) during the first 1-3 h at altitude while normoxic conditions were maintained, 3-5) at 6, 24 and 72 h of hypoxia, and 6) after Ve acclimatization at altitude in 5-14 d. After altitude acclimatization, the peak-to-peak amplitude of the H reflex and the ATR response was significantly elevated over control. A trend toward decreased amplitudes of both the ATR and the H reflex was observed at 6 h after the onset of hypoxia. There was no significant alteration in latency of the H reflex under any test condition. These findings suggest that sojourn at altitude by sea level residents induces changes in spinal motor reflexes. These changes are most probably mediated by altered high central modulation of the cord.
对12名健康男性在六种条件下进行了H反射和跟腱反射（ATR）研究：1）海平面对照；2）在海拔高度的最初1 - 3小时内，保持常氧条件；3 - 5）在缺氧6、24和72小时时；6）在海拔高度进行5 - 14天的通气适应后。海拔适应后，H反射和ATR反应的峰峰值幅度比对照显著升高。在缺氧开始后6小时，观察到ATR和H反射的幅度均有降低趋势。在任何测试条件下，H反射的潜伏期均无显著改变。这些发现表明，海平面居民在海拔高度停留会引起脊髓运动反射的变化。这些变化很可能是由脊髓高级中枢调节改变介导的。
