Caffeine, carbohydrate and cooling use during prolonged simulated tennis

Hornery, Daniel J., Farrow, Damian, Mujika, Inigo and Young, Warren B. (2007) Caffeine, carbohydrate and cooling use during prolonged simulated tennis. International Journal of Sports Physiology and Performance, 2 4: 423-438.


Author Hornery, Daniel J.
Farrow, Damian
Mujika, Inigo
Young, Warren B.
Title Caffeine, carbohydrate and cooling use during prolonged simulated tennis
Journal name International Journal of Sports Physiology and Performance   Check publisher's open access policy
ISSN 1555-0265
1555-0273
Publication date 2007-12
Sub-type Article (original research)
Volume 2
Issue 4
Start page 423
End page 438
Total pages 16
Place of publication Champaign, IL, United States
Publisher Human Kinetics
Language eng
Subject 170112 Sensory Processes, Perception and Performance
1106 Human Movement and Sports Science
Abstract Purpose: To determine the effects of prolonged simulated tennis on performance and the ergogenic potential of caffeine, carbohydrates, and cooling. Methods: Twelve highly trained male tennis players (age 18.3 ± 3.0 y, height 178.8 ± 8.5 cm, body mass 73.95 ± 12.30 kg, mean ± SD) performed 4 simulated matches (2 h 40 min) against a ball machine on an indoor hard court. The counterbalanced experimental trials involved caffeine supplementation (3 mg/kg), carbohydrate supplementation (6% solution), precooling and intermittent cooling, and placebo control. Physiological markers (core temperature, heart rate, blood lactate, and blood glucose), subjective responses (ratings of perceived exertion and thermal sensation), stroke velocity and accuracy, serve kinematics, and tennis-specific perceptual skill quantified the efficacy of interventions. Results: Significant effects of time (P < .01) reflected increased physiological demand, reduced serve velocity and ground-stroke velocity and accuracy, and a slowing of the serve racket-arm acceleration phase. Caffeine increased serve velocity (165 ± 15 km/h) in the final set of the match (P = .014) compared with placebo (159 ± 15 km/h, P = .008) and carbohydrate (158 ± 13 km/h, P = .001) conditions. Carbohydrate and cooling conditions afforded physiological advantage (increased blood glucose, P < .01, and reduced preexercise thermal sensation, P < .01) but did not affect performance relative to the placebo condition. Conclusions: Prolonged simulated tennis induced significant decrements in tennis skills. Caffeine supplementation partly attenuated the effects of fatigue and increased serve velocity. In contrast, carbohydrate and cooling strategies had little ergogenic effect on tennis performance.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Human Movement and Nutrition Sciences Publications
 
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Created: Thu, 05 Mar 2009, 13:47:04 EST by Judy Dingwall on behalf of School of Human Movement and Nutrition Sciences