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Glycerol-induced hyperhydration: a method for estimating the optimal load of fluid to be ingested before exercise to maximize endurance performance.
J Strength Cond Res. 2010 Jan; 24(1):74-8.JS

Abstract

Glycerol-induced hyperhydration (GIH) has been shown to increase endurance performance (EP). However, EP starts declining at a dehydration level >2% body weight (BW). It thus appears that the use of GIH is only required when athletes anticipate that their fluid intake during exercise would not be sufficient to prevent a loss of BW >2%. In such a scenario, the optimal GIH load to be ingested before exercise would correspond to the amount of fluid that cannot be drunk during exercise and that would be just sufficient to keep the dehydration level <2% BW. No method exists enabling the estimation of the most optimal GIH load to be drunk before exercise to optimize EP. Here, such a method comprising 3 easy steps is presented. Step 1 provides a formula allowing users to determine relative exercise-induced dehydration level based on individual BW, exercise time, and estimated hourly sweat rate and fluid consumption during exercise. Step 2 takes into account the result of step 1 and provides a formula allowing determination of the minimal GIH load required before exercise to prevent a loss of BW >2%. Step 3 consists of identifying, among those pre-selected, a GIH protocol that increases body water by at least the amount computed in step 2. This method will remove much of the guess work involved in the decision-making process of the optimal amount of GIH that should be ingested before exercise by athletes for maximizing EP and will serve as a practical reference tool for all athletes using, and coaches, practitioners, and exercise physiologists recommending the utilization of, GIH as an ergogenic aid.

Authors+Show Affiliations

McGill Nutrition and Food Science Centre, McGill University Health Centre, Royal Victoria Hospital, Montréal, Québec, Canada. eric.goulet@usherbrooke.ca

Pub Type(s)

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

Language

eng

PubMed ID

19996773

Citation

Goulet, Eric D B.. "Glycerol-induced Hyperhydration: a Method for Estimating the Optimal Load of Fluid to Be Ingested Before Exercise to Maximize Endurance Performance." Journal of Strength and Conditioning Research, vol. 24, no. 1, 2010, pp. 74-8.
Goulet ED. Glycerol-induced hyperhydration: a method for estimating the optimal load of fluid to be ingested before exercise to maximize endurance performance. J Strength Cond Res. 2010;24(1):74-8.
Goulet, E. D. (2010). Glycerol-induced hyperhydration: a method for estimating the optimal load of fluid to be ingested before exercise to maximize endurance performance. Journal of Strength and Conditioning Research, 24(1), 74-8. https://doi.org/10.1519/JSC.0b013e3181bd43e2
Goulet ED. Glycerol-induced Hyperhydration: a Method for Estimating the Optimal Load of Fluid to Be Ingested Before Exercise to Maximize Endurance Performance. J Strength Cond Res. 2010;24(1):74-8. PubMed PMID: 19996773.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Glycerol-induced hyperhydration: a method for estimating the optimal load of fluid to be ingested before exercise to maximize endurance performance. A1 - Goulet,Eric D B, PY - 2009/12/10/entrez PY - 2009/12/10/pubmed PY - 2010/3/17/medline SP - 74 EP - 8 JF - Journal of strength and conditioning research JO - J Strength Cond Res VL - 24 IS - 1 N2 - Glycerol-induced hyperhydration (GIH) has been shown to increase endurance performance (EP). However, EP starts declining at a dehydration level >2% body weight (BW). It thus appears that the use of GIH is only required when athletes anticipate that their fluid intake during exercise would not be sufficient to prevent a loss of BW >2%. In such a scenario, the optimal GIH load to be ingested before exercise would correspond to the amount of fluid that cannot be drunk during exercise and that would be just sufficient to keep the dehydration level <2% BW. No method exists enabling the estimation of the most optimal GIH load to be drunk before exercise to optimize EP. Here, such a method comprising 3 easy steps is presented. Step 1 provides a formula allowing users to determine relative exercise-induced dehydration level based on individual BW, exercise time, and estimated hourly sweat rate and fluid consumption during exercise. Step 2 takes into account the result of step 1 and provides a formula allowing determination of the minimal GIH load required before exercise to prevent a loss of BW >2%. Step 3 consists of identifying, among those pre-selected, a GIH protocol that increases body water by at least the amount computed in step 2. This method will remove much of the guess work involved in the decision-making process of the optimal amount of GIH that should be ingested before exercise by athletes for maximizing EP and will serve as a practical reference tool for all athletes using, and coaches, practitioners, and exercise physiologists recommending the utilization of, GIH as an ergogenic aid. SN - 1533-4287 UR - https://www.unboundmedicine.com/medline/citation/19996773/Glycerol_induced_hyperhydration:_a_method_for_estimating_the_optimal_load_of_fluid_to_be_ingested_before_exercise_to_maximize_endurance_performance_ L2 - http://dx.doi.org/10.1519/JSC.0b013e3181bd43e2 DB - PRIME DP - Unbound Medicine ER -