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KMID : 1101720140180020215
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Physical Activity and Nutrition
2014 Volume.18 No. 2 p.215 ~ p.223
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Effects of active drinking practices on fluid consumption and sweat rate while exercising in a hot environment
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Son Youn-Sun
Hwang Bong-Yeon
Lee Dae-Taek
Bae Yoon-Jung
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Abstract
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[Purpose] To examine the effects of active drinking practices on fluid consumption and sweat rate while exercising in a hot environment.
[Methods] Nine men completed two experiments. Each consisted of 3 phases: pre-testing (pre), training period, and post-testing (post). During testing, the subjects ran on a treadmill at a moderate intensity for 90 min at 39 ± 1℃ followed by a 3-h recovery. They drank ad libitum. During training, they ran for 90 min for 7 days while either drinking actively (AH, 150% of weight loss) or passively (PH, 50% of weight loss).
[Results] The actual volume consumed in training was three times greater during AH than during PH. In post during AH, the volume of drinking was two times greater than pre (1592 ± 953 and 855 ± 551 mL, respectively; p < 0.05). No difference in volume consumption during PH between pre and post was found. The sweat loss during exercise was greater in post (1377 ± 956 mL) than in pre (558 ± 642 mL) during AH (p < 0.05), but not during PH. Rectal temperature and heart rate decreased after training. Serum osmolality following exercise were not different than the baseline or between the conditions.
[Conclusion] Active drinking practices while exercising in a hot environment induced greater voluntary fluid intake and sweat loss.
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KEYWORD
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voluntary intake, rehydration, thermoregulation
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