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Rehydration with glycerol: endocrine, cardiovascular, and thermoregulatory responses during exercise in the heat.
J Appl Physiol (1985). 2006 Feb; 100(2):442-50.JA

Abstract

The impact of rehydration with glycerol on cardiovascular and thermoregulatory responses during exercise in the heat was studied in eight highly trained male cyclists. Each subject completed three dehydration-rehydration experimental trials that differed only in the rehydration treatment, each separated by 7 days. Before each experimental day, subjects dehydrated to -4% of their body weight by exercise and water restriction. The experimental treatments were as follows: no fluid (NF), glycerol bolus (1 g/kg body wt) followed by water (G), and water alone (W). Rehydration (3% body weight) was given over an 80-min period. After rehydration, subjects cycled (74% peak O2 uptake) to exhaustion in a hot and wet (37 degrees C and 48% relative humidity) environment. For G, plasma volume was expanded (P < 0.05) during rehydration and remained higher than W (P < 0.05) during exercise. Exercise time to exhaustion during G (33 +/- 4 min) was longer (P < 0.05) compared with both W (27 +/- 3 min) and NF (19 +/- 3 min). Cutaneous vascular conductance was significantly elevated (P < 0.05) during G, but G provided no other thermoregulatory or cardiovascular benefits compared with W and NF. Fluid-regulating hormones (vasopressin, aldosterone, atriopeptin, and plasma renin activity) decreased during rehydration and increased during exercise (except atriopeptin), but there were no differences between G and W. These data indicated that glycerol had little or no major effect on fluid-regulating factors during rehydration or exercise, and the improved exercise capacity in G was likely due to a greater plasma volume during exercise.

Authors+Show Affiliations

Human Performance Laboratory, Department of Kinesiology, University of Connecticut, Storrs, USA. skav@hua.grNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

16210441

Citation

Kavouras, Stavros A., et al. "Rehydration With Glycerol: Endocrine, Cardiovascular, and Thermoregulatory Responses During Exercise in the Heat." Journal of Applied Physiology (Bethesda, Md. : 1985), vol. 100, no. 2, 2006, pp. 442-50.
Kavouras SA, Armstrong LE, Maresh CM, et al. Rehydration with glycerol: endocrine, cardiovascular, and thermoregulatory responses during exercise in the heat. J Appl Physiol. 2006;100(2):442-50.
Kavouras, S. A., Armstrong, L. E., Maresh, C. M., Casa, D. J., Herrera-Soto, J. A., Scheett, T. P., Stoppani, J., Mack, G. W., & Kraemer, W. J. (2006). Rehydration with glycerol: endocrine, cardiovascular, and thermoregulatory responses during exercise in the heat. Journal of Applied Physiology (Bethesda, Md. : 1985), 100(2), 442-50.
Kavouras SA, et al. Rehydration With Glycerol: Endocrine, Cardiovascular, and Thermoregulatory Responses During Exercise in the Heat. J Appl Physiol. 2006;100(2):442-50. PubMed PMID: 16210441.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Rehydration with glycerol: endocrine, cardiovascular, and thermoregulatory responses during exercise in the heat. AU - Kavouras,Stavros A, AU - Armstrong,Lawrence E, AU - Maresh,Carl M, AU - Casa,Douglas J, AU - Herrera-Soto,Jorge A, AU - Scheett,Timothy P, AU - Stoppani,James, AU - Mack,Gary W, AU - Kraemer,William J, Y1 - 2005/10/06/ PY - 2005/10/8/pubmed PY - 2006/12/29/medline PY - 2005/10/8/entrez SP - 442 EP - 50 JF - Journal of applied physiology (Bethesda, Md. : 1985) JO - J. Appl. Physiol. VL - 100 IS - 2 N2 - The impact of rehydration with glycerol on cardiovascular and thermoregulatory responses during exercise in the heat was studied in eight highly trained male cyclists. Each subject completed three dehydration-rehydration experimental trials that differed only in the rehydration treatment, each separated by 7 days. Before each experimental day, subjects dehydrated to -4% of their body weight by exercise and water restriction. The experimental treatments were as follows: no fluid (NF), glycerol bolus (1 g/kg body wt) followed by water (G), and water alone (W). Rehydration (3% body weight) was given over an 80-min period. After rehydration, subjects cycled (74% peak O2 uptake) to exhaustion in a hot and wet (37 degrees C and 48% relative humidity) environment. For G, plasma volume was expanded (P < 0.05) during rehydration and remained higher than W (P < 0.05) during exercise. Exercise time to exhaustion during G (33 +/- 4 min) was longer (P < 0.05) compared with both W (27 +/- 3 min) and NF (19 +/- 3 min). Cutaneous vascular conductance was significantly elevated (P < 0.05) during G, but G provided no other thermoregulatory or cardiovascular benefits compared with W and NF. Fluid-regulating hormones (vasopressin, aldosterone, atriopeptin, and plasma renin activity) decreased during rehydration and increased during exercise (except atriopeptin), but there were no differences between G and W. These data indicated that glycerol had little or no major effect on fluid-regulating factors during rehydration or exercise, and the improved exercise capacity in G was likely due to a greater plasma volume during exercise. SN - 8750-7587 UR - https://www.unboundmedicine.com/medline/citation/16210441/Rehydration_with_glycerol:_endocrine_cardiovascular_and_thermoregulatory_responses_during_exercise_in_the_heat_ L2 - http://journals.physiology.org/doi/full/10.1152/japplphysiol.00187.2005?url_ver=Z39.88-2003&amp;rfr_id=ori:rid:crossref.org&amp;rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -