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Comparison of glycerol and water hydration regimens on tennis-related performance
Meir Magal1, Michael J Webster, Lucille E Sistrunk
1School of Human Performance and Recreation, University of Southern Mississippi, Hattiesburg, MS, USA. meirmagal@cs.com
Purpose:
To compare glycerol and water hyperhydration and rehydration on tennis related skill and agility performance.
Methods:
Eleven male subjects completed two counter-balanced, double-blind trials. Each trial consisted of three phases: 1). hyperhydration with or without glycerol (1.0 g.kg/(-1)) over 150 min, 2). 120 min of exercise-induced dehydration (EID), and 3) rehydration with or without glycerol (0.5 g.kg(-1)) over 90 min. After each phase, subjects performed 5- and 10-m sprint tests, a repeated-effort agility test, and tennis skill tests.
Results:
Glycerol (G) hyperhydration significantly increased fluid retention by approximately 900 mL over the placebo (P) (P
Conclusion:
The data demonstrate that relatively modest hypohydration ( approximately 2.7%) as a result of EID, significantly slows 5- and 10-m sprint times. Furthermore, although the glycerol hydration regimen provided a better hydration status than the placebo hydration regimen, no performance benefits were observed.
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