Fatigue caused by using night train to mountaineering site

Abstract

With popularization of mountain climbing lately, accidents and trouble occur repeatedly throughout the year. We can imagine a conbination of various factors for the cause of these. Fatigue or exhaustion of physical fitness seem to take a large part.
Table 1 shows item and locality of measurements. Table 2 shows comparison of measurements of those lacking in sleep and of those after ample sleep.
The climbing course was from Tanigawadake Doaiguchi to Tenjindaira, the difference in height was 800 meters, distance about 5 Kilo metes (2 hour and 40 minutes) .
Six male subjects were selected from the university mountain climbing club. The research and investigation was conducted at the begining of December but snowdrifts were few. We were favored by magnificent weather.
The summary of result is as follows : This mountain climbing for subjects who had enough sleep, was not burden from the view point of physiological functions. We could hardly find any apparent fatigue and the climbers were cheerful. But we could find weakness of function on flicker test, step test, examination of urine, etc., in the group who lacked sleep. After the mountain climbing they showed a marked decline of function in threshold of pateller reflex and step test. (of Tables 4, 5, Fig. 1)
Their heart rate while climbing increased distinguishably, their recovery at rest time was slow. (Figs. 2, 3) And they seemed not to have enough strength in reserve. Result of subjective fatigue sympton showed in Figure 4 show a large differein sleep nce between these two groups. From these it may be thought that in the group lacking the phenomenon of fatigue is very pronounced.
We found that these variations in physical function are caused not only by climbing, but by lack of sleep.
So to climb mountains without sleep promotes weakness of physical function and fatigue. We can expect that it is easy to have accidents or troubles when environment takes a turn for the worse during unreasonable climbing.