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Hydration Status and Voluntary Fluid Intake in College‐Age Gymnasts Training in a Hot Environment
Author(s) -
Hasegawa Hiroyuki,
Fujihara Toshiyuki,
Mukumoto Masanobu,
Tawara Hiroaki,
Okamura Koji
Publication year - 2015
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.29.1_supplement.lb304
Subject(s) - urine specific gravity , fluid intake , medicine , training (meteorology) , urine osmolality , urine , body fluid , turnover , physical therapy , physiology , zoology , biology , physics , management , meteorology , economics
The purpose of the present study was to investigate the hydration status and voluntary fluid intake among college age gymnasts practicing in a hot environment to establish the optimal guidelines on hydration for gymnasts. Since the duration of training sessions for gymnasts tends to be quite long, we hypothesized that gymnasts would not be able to maintain a sufficient hydration status during such training sessions. Twenty‐two college age gymnasts (10 males (M) and 12 females (F), mean age 20.7 (SD 1.6) years) participated in this study. The subjects were allowed to consume their usual drinks ad‐libitum during the training, and the intake was measured. The body mass (BM) significantly decreased in both M (M = ‐1.4 (0.6)%) and F (‐0.7 (0.7)%) after the training (P < 0.05). In terms of the body temperature and urine osmolality, there was no significant difference before and after the training. The urine specific gravity (USG) was significantly higher after the training (M = 1.036 (0.004), F = 1.034 (0.004)) than before the training (M = 1.030 (0.006), F = 1.027 (0.005)). The fluid intake was 549.6 (331.6) ml/5.5hrs for M and 1463.1 (424.8) ml/4.5hrs for F. These results demonstrated that college age gymnasts showed a BM decrease of less than 2% after the training in the hot environment, and the hydration status did not differ before and after the training. The USG, however, was greater than 1.025 even before the training in many gymnasts, suggesting that these athletes were dehydrated according to the ACSM guidelines.