Physiological Changes Observed During the Expedition to Mt. Bogda (5, 445m)

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During the Expedition to Mt. Bogda (5, 445m), physiological parameters were measured on 8 male and 3 female members during the course of adaptation to the altitude together with the recording of subjective symptoms of acute mountain sickness. Results obtained are as follows: 1) Basal heart rate was increased by 16.3±7.7 beats/min at the attained altitude of 3, 700m compared with that at sea level. The stay for about a week at 3, 700m altitude caused gradual decrease of heart rate: the decrease of about 10 beats/min was observed compared with that obtained on arrival at this altitude. 2) Basal body temperature varied almost in parallel with the basal heart rate and the increase by 0, 4±0, 6°C was observed on arrival at the altitude of 3, 700m. 3) Breath holding time showed inverse correlation to altitude and decrease to about 30% of that of sea level was observed at the altitude of 4, 000m. 4) Urine volume showed a tendency to decrease on arrival at the altitude of 3, 700m. The stay for about 1 week at this altitude caused diuresis with excretion of a large amount of NaCI. Concomitantly Na<SUP>+</SUP>/K<SUP>+</SUP> ratio increased significantly. Summarizing the results, it is suggested that the acclimatization to the altitude of 4, 000-5, 000m takes at least 7 days after arrival to this altitude.
日本生気象学会の論文