著者

髙木 祐介 関 和俊 北村 裕美

出版者

日本野外教育学会

雑誌

野外教育研究 (ISSN:13439634)

巻号頁・発行日

vol.18, no.1, pp.33-39, 2015 (Released:2018-12-29)

参考文献数

12

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The purpose of this study was to investigate the changes of salty taste sensitivity and sweat loss during hiking the mountain. Nine healthy young males(23±4 years)were volunteered to hike Mt. Rokko(altitude: 931 m)that located in Hyogo prefecture. Heart rate(HR), rating of perceived exertion(RPE),body weight, water intake, sweat loss, and salty taste sensitivity(STS)were measured at 2 different altitudes of mountain ascending(P1: altitude 30 m, P2: altitude 920 m). HR in all subjects markedly increased during ascending. HRmax indicated 172±14 bpm. RPE at P1 was 7±1, and P2 was 15±3. It was considered that exercise intensity of hiking the mountain in this study was more than moderate intensity. Total water intake was 1,347±390 ml and total sweat loss were 2.2±0.9 kg in the subjects that drinking only the water condition. The percentage of total sweat loss to initial body weight indicated 3.4%. STS at P2 was significantly lower than those at P1(p<0.05). This study clarified that drinking only the water during hiking significantly decreased salty taste sensitivity. These results suggest that the assessment of salty taste sensitivity might be the index for the prevention of heat stroke during hiking.

著者

堀 天 髙木 祐介 相川 悠貴 福地 かおり 吉川 明里 藤原 紗音 小木曽 洋介 下村 有佳里 家吉 彩夏 枝元 香菜子 関 和俊 堀田 典生

出版者

一般社団法人 日本体育・スポーツ・健康学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

vol.67, pp.761-773, 2022 (Released:2022-09-27)

参考文献数

44

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Sudden cardiac death is a common cause of death during hiking activities. Since the exaggerated blood pressure (BP) response to physical activity is known to increase the risk for the development of cardiovascular events, hiking might also induce an excessive BP response and such events. The purpose of this study was to investigate the effects of hiking at around 1,200 m on the circulatory responses to isometric handgrip (IHG) exercise. Five healthy women volunteered to hike and stay at Mt. Ibuki (altitude, 1,377 m; Shiga, Japan) for 2 consecutive days. On the first day, the participants ascended to 1,220 m (Hiking study), and on the second day, they drove to an altitude of 1,260 m where they remained for about 5.5 h (Staying study). The participants performed IHG exercise before (altitude, 220 m), during (altitude, 990 m), and after (altitude, 220 m) hiking in the Hiking study, and before driving (altitude, 160 m), after staying for 5 h (altitude, 1,260 m), and after driving back from an altitude of 1,260 m (altitude, 122 m) in the Staying study. The participants performed IHG exercise at 30% maximum voluntary contraction for 2 min after seated rest. We measured systolic and diastolic BP (SBP and DBP), and pulse rate during the test, and then calculated the double product (DP) from the product of the SBP and pulse rate. In the Hiking study, SBP and DP responses to IHG exercise during hiking were significantly augmented (P < 0.05). Importantly, these responses to IHG exercise during hiking were significantly higher than those before hiking (P < 0.05). On the other hand, in the Staying study, staying at an altitude of 1,260 m for about 5.5 h did not significantly change circulatory responses to IHG exercise. In conclusion, we demonstrated that SBP and DP during IHG exercise were significantly augmented during hiking at an elevation difference of about 1,000 m. This finding suggests that transient increases in BP due to physical activity, which might trigger cardiovascular events, could be enhanced during hiking at a moderate altitude.