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Effect of glycerol-induced hyperhydration on thermoregulation and metabolism during exercise in the heat

Anderson, M., Cotter, J., Garnham, Andrew, Casley, D. and Febbraio, M. 2001, Effect of glycerol-induced hyperhydration on thermoregulation and metabolism during exercise in the heat, International journal of sport and exercise metabolism, vol. 11, no. 3, pp. 315-333.

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Title Effect of glycerol-induced hyperhydration on thermoregulation and metabolism during exercise in the heat
Author(s) Anderson, M.
Cotter, J.
Garnham, Andrew
Casley, D.
Febbraio, M.
Journal name International journal of sport and exercise metabolism
Volume number 11
Issue number 3
Start page 315
End page 333
Publisher Human Kinetics Publishers
Place of publication Champaign, Ill.
Publication date 2001-09
ISSN 1526-484X
1543-2742
Keyword(s) nutrition
exercise
heat
water-electrolyte balance (Physiology)
dehydration (Physiology)
glycerin
dietary supplements
Summary This study examined the effect of glycerol ingestion on fluid homeostasis, thermoregulation, and metabolism during rest and exercise. Six endurance-trained men ingested either 1 g glycerol in 20 ml H2O.kg-1 body weight (bw) (GLY) or 20 ml H2O.kg-1bw (CON) in a randomized double-blind fashion, 120 min prior to undertaking 90 min of steady state cycle exercise (SS) at 98 % of lactate threshold in dry heat (35 degrees C, 30 % RH), with ingestion of CHO-electrolyte beverage (6 % CHO) at 15-min intervals. A 15-min cycle, where performance was quantified in kJ, followed (PC). Pre-exercise urine volume was lower in GLY than CON (1119 ± 97 vs. 1503 ± 146 ml· 120 min-1; p < .05). Heart rate was lower (p < .05) throughout SS in GLY, while forearm blood flow was higher (17.1 ± 1.5 vs. 13.7 ± 3.0 ml.100 g tissue·min-1; p < .05) and rectal  temperature lower (38.7 ± 0.1 vs. 39.1 ± 0.1 ° C; p < .05) in GLY late in SS. Despite these changes, skin and muscle temperatures and circulating catecholamines were not different between trials. Accordingly, no differences were observed in muscle glycogenolysis, lactate accumulation, adenine nucleotide, and phosphocreatine degradation or inosine 5'-monophosphate accumulation when comparing GLY with CON. Of note, the work performed during PC was 5 % greater in GLY (252 ± 10 vs. 240 ± 9 kJ; p < .05). These results demonstrate that glycerol, when ingested with a bolus of water 2 hours prior to exercise, results in fluid retention, which is capable of reducing cardiovascular strain and enhancing thermoregulation. Furthermore, this practice increases exercise performance in the heat by mechanisms other than alterations in muscle metabolism.
Language eng
Field of Research 110602 Exercise Physiology
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2001, Human Kinetics Publishers, Inc.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30008474

Document type: Journal Article
Collection: School of Health Sciences
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