Terasawa K, Fujiwara T, Sakai A, Yanagidaira N, Asano K, Yanagisawa K, Kashimura N, Ueda G, Wu T, Zhang Y
Shinshu University, Center for General Education, Asahi Matsumoto, Japan.
Int J Biometeorol. 1996 Sep;39(3):111-5. doi: 10.1007/BF01211221.
Handgrip force (HF), maximal pinch force (MF), muscle endurance (ME), and the median power frequency (MdPF) of the activity shown in the electromyogram (EMG) were studied at various altitudes in eight normal healthy subjects. MF and ME were measured between the index finger and thumb, and all measurements were obtained at altitudes ranging from 610 to 4860 m during an expedition in the Qinghai Plateau in China. With the change in altitude HF, ME, and MF showed no significant change. Compared to the MdPF at 2260 m on ascent, the MdPF at other altitudes showed a significant decrease (P < 0.01). Thus, we conclude that muscle performance (HF, MF, and ME) was not affected by the environment at high altitude. However, MdPF was affected and the mean MdPF at 610 m after the expedition did not recover to initial values of MdPF. We suggest these results may have been affected by fatigue and chronic exposure to the hypobaric hypoxic environment, since the members of the expedition party expressed feelings of sluggishness and fatigue after the expedition.
对8名正常健康受试者在不同海拔高度下的握力（HF）、最大捏力（MF）、肌肉耐力（ME）以及肌电图（EMG）所示活动的中位功率频率（MdPF）进行了研究。MF和ME在食指和拇指之间测量，所有测量均在中国青藏高原一次考察期间于海拔610至4860米的范围内进行。随着海拔的变化，HF、ME和MF未显示出显著变化。与上升至2260米时的MdPF相比，其他海拔高度的MdPF显著降低（P < 0.01）。因此，我们得出结论，肌肉性能（HF、MF和ME）不受高海拔环境的影响。然而，MdPF受到了影响，考察结束后610米处的平均MdPF未恢复到MdPF的初始值。我们认为这些结果可能受到了疲劳以及长期暴露于低压低氧环境的影响，因为考察队员在考察结束后表示有慵懒和疲劳的感觉。
