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The effects of rehydration on cycling performance after exercise-induced dehydration.
Southeast Asian J Trop Med Public Health. 2002 Jun; 33(2):378-88.SA

Abstract

The effects of 7.6% carbohydrate-electrolyte solution (CES) and placebos (P) on rehydration (R) after exercise-induced dehydration and on a subsequent time-trial (TT) of cycling performance were studied. Thirteen male subjects exercised in a thermally-controlled environment (28 degrees C, 63% RH) until 3% of their body weight was lost. After exercise, the subjects moved to a neutral environment (22 degrees C) and rested for 30 minutes prior to a 2-hour R period. During R, subjects were fed CES or P to a maximum volume of 120% of previous body mass loss at 0, 30, and 60 minutes, in bolus-doses of 50%, 40% and 30% respectively. After R, subjects performed a 1-hour TT with no further fluid intake. % R with CES was significantly higher than with P (70 +/- 3% vs 60 +/- 5%; p < 0.01). During the TT, blood glucose dropped in the CES group but not in the P group. It was found that, despite a more effective R with CES, the performance results did not differ between groups (65.1 +/- 2.2 minutes and 65.2 +/- 2.3 minutes for CES and P respectively). It is suggested that an insulin-mediated rebound effect on CHO metabolism during TT, in which no further CHO was supplied, nullified the benefits of rehydration.

Authors+Show Affiliations

Sports Science Unit, School of Medical Sciences, Universiti Sains Malaysia, Kelantan. rabindar@kck.usm.myNo affiliation info availableNo affiliation info available

Pub Type(s)

Clinical Trial
Controlled Clinical Trial
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

12236441

Citation

Singh, R, et al. "The Effects of Rehydration On Cycling Performance After Exercise-induced Dehydration." The Southeast Asian Journal of Tropical Medicine and Public Health, vol. 33, no. 2, 2002, pp. 378-88.
Singh R, Brouns F, Kovacs E. The effects of rehydration on cycling performance after exercise-induced dehydration. Southeast Asian J Trop Med Public Health. 2002;33(2):378-88.
Singh, R., Brouns, F., & Kovacs, E. (2002). The effects of rehydration on cycling performance after exercise-induced dehydration. The Southeast Asian Journal of Tropical Medicine and Public Health, 33(2), 378-88.
Singh R, Brouns F, Kovacs E. The Effects of Rehydration On Cycling Performance After Exercise-induced Dehydration. Southeast Asian J Trop Med Public Health. 2002;33(2):378-88. PubMed PMID: 12236441.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The effects of rehydration on cycling performance after exercise-induced dehydration. AU - Singh,R, AU - Brouns,F, AU - Kovacs,E, PY - 2002/9/19/pubmed PY - 2003/1/28/medline PY - 2002/9/19/entrez SP - 378 EP - 88 JF - The Southeast Asian journal of tropical medicine and public health JO - Southeast Asian J Trop Med Public Health VL - 33 IS - 2 N2 - The effects of 7.6% carbohydrate-electrolyte solution (CES) and placebos (P) on rehydration (R) after exercise-induced dehydration and on a subsequent time-trial (TT) of cycling performance were studied. Thirteen male subjects exercised in a thermally-controlled environment (28 degrees C, 63% RH) until 3% of their body weight was lost. After exercise, the subjects moved to a neutral environment (22 degrees C) and rested for 30 minutes prior to a 2-hour R period. During R, subjects were fed CES or P to a maximum volume of 120% of previous body mass loss at 0, 30, and 60 minutes, in bolus-doses of 50%, 40% and 30% respectively. After R, subjects performed a 1-hour TT with no further fluid intake. % R with CES was significantly higher than with P (70 +/- 3% vs 60 +/- 5%; p < 0.01). During the TT, blood glucose dropped in the CES group but not in the P group. It was found that, despite a more effective R with CES, the performance results did not differ between groups (65.1 +/- 2.2 minutes and 65.2 +/- 2.3 minutes for CES and P respectively). It is suggested that an insulin-mediated rebound effect on CHO metabolism during TT, in which no further CHO was supplied, nullified the benefits of rehydration. SN - 0125-1562 UR - https://www.unboundmedicine.com/medline/citation/12236441/The_effects_of_rehydration_on_cycling_performance_after_exercise_induced_dehydration_ L2 - https://medlineplus.gov/dehydration.html DB - PRIME DP - Unbound Medicine ER -