The change of subjective and objective fatigue during class in ski

• Published in: Japanese Journal of Physical Education and Sport for Higher Education Vol. 17; pp. 79 - 85
• Main Authors: MORI, Kenichi, TANAKA, Ai, TAKAMARU, Isao, UEMUKAI, Kanshi, ONO, Takashi
• Format: Journal Article
• Language: Japanese
• Published: Japanese Association of University Physical Eduation and Sports 2020; 公益社団法人 全国大学体育連合
• Subjects: objective fatigue; ski class; subjective fatigue; スキー実習; 主観的疲労; 客観的疲労
• ISSN: 2434-7957
• DOI: 10.20723/jpeshe.17.0_79

The purpose of this study was to investigate the change of subjective and objective fatigue in ski class, and to obtain data for making lesson plan including students physical condition management. The subjects were twenty university students (11 males and 9 females) were participated in 4 days ski class. As index of subjective fatigue, subjective feelings of fatigue symptoms and local physical fatigue symptoms, as index of objective fatigue, grip strength, counter movement jump (CMJ), straight leg raising test (SLR-test), heart rate (HR), salivary amylase activity and muscle hardness were measured. In the measurement, subjective fatigue was measured in the morning (around 7:00) and in the night (around 20:00), and objective fatigue was measured in the afternoon. The main results were that subjective fatigue (Factor Ⅳ: feeling of local pain or dullness) showed a significant increase since on the morning of the third day compared with the measurement before the class on the first day. Other variables that group Ⅰ(feeling of drowsiness), Ⅱ(feeling of instability), Ⅲ(feeling of uneasiness) and Ⅴ(feeling of eyestrain) were no significant change. The results of the local physical fatigue symptoms showed that lower legs were significantly increased since the night of the second day, upper limbs, thigh and hip parts were significantly increased since the morning of the third day. Objective fatigue (grip strength and SLR-test) showed a significant decrease since night of the first day compared with the measurement before the class on the first day. In addition, CMJ showed a significant decrease since second day. HR and salivary amylase activity were no significant change. Therefore, it was considered that there was a discrepancy between subjective and objective fatigue. In other words, these results suggest that the accumulation of fatigue progresses more than own feels, and showing the difficulty of grasping the student's health management with survey of subjective symptoms. And more health care management was needed.