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Effects of different doses of caffeine on exercise responses in young children.

Publication ,  Journal Article
Turley, KR; Bland, JR; Evans, WJ
Published in: Med Sci Sports Exerc
May 2008

INTRODUCTION/PURPOSE: This study investigated the effects of three different doses of caffeine on physiological responses to exercise in young children. METHODS: Forty healthy children (20 boys and 20 girls) volunteered for a random, double-blind, counterbalanced study where they received either placebo (PL), 1 mg.kg(-1) (CAF-1), 3 mg.kg(-1) (CAF-3), or 5 mg.kg(-1) (CAF-5) caffeine, 60 min prior to preexercise measures, followed by cycle ergometer exercise at 25 W and then 60% VO2peak. During this time, heart rate (HR), oxygen consumption (VO2), and respiratory exchange ratio (RER) were measured continuously, while blood pressure (BP) was measured every 2 min. RESULTS: There were no significant gender x treatment interactions, and so the boys' and girls' data were combined. At preexercise, CAF-5 SBP and DBP were significantly (P < 0.05) higher than PL. Both CAF-1 and CAF-3 DBP were also significantly (P < 0.05) higher versus PL at preexercise. There were no treatment effects for exercise BP. At rest and during both exercise intensities, HR was significantly (P < 0.05) lower in CAF-3 (approximately 5 bpm) and CAF-5 (approximately 6 bpm) versus PL. There were no significant effects of CAF on metabolism (VO2 or RER) except for a lower RER in CAF-1 versus CAF-5 at 60% VO2peak. CONCLUSION: Low, mild, and moderate (1, 3, and 5 mg.kg(-1)) doses of caffeine have no effect on substrate use as reflected by RER. Further, caffeine intake resulted in an increase in BP and decrease in HR at preexercise and a slight decrease in HR with CAF-3 and CAF-5 versus PL during exercise.

Duke Scholars

Published In

Med Sci Sports Exerc

DOI

ISSN

0195-9131

Publication Date

May 2008

Volume

40

Issue

5

Start / End Page

871 / 878

Location

United States

Related Subject Headings

  • Sport Sciences
  • Oxygen Consumption
  • Male
  • Humans
  • Heart Rate
  • Female
  • Exercise
  • Double-Blind Method
  • Child
  • Caffeine
 

Citation

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Turley, K. R., Bland, J. R., & Evans, W. J. (2008). Effects of different doses of caffeine on exercise responses in young children. Med Sci Sports Exerc, 40(5), 871–878. https://doi.org/10.1249/MSS.0b013e318165984c
Turley, Kenneth R., Justin R. Bland, and William J. Evans. “Effects of different doses of caffeine on exercise responses in young children.Med Sci Sports Exerc 40, no. 5 (May 2008): 871–78. https://doi.org/10.1249/MSS.0b013e318165984c.
Turley KR, Bland JR, Evans WJ. Effects of different doses of caffeine on exercise responses in young children. Med Sci Sports Exerc. 2008 May;40(5):871–8.
Turley, Kenneth R., et al. “Effects of different doses of caffeine on exercise responses in young children.Med Sci Sports Exerc, vol. 40, no. 5, May 2008, pp. 871–78. Pubmed, doi:10.1249/MSS.0b013e318165984c.
Turley KR, Bland JR, Evans WJ. Effects of different doses of caffeine on exercise responses in young children. Med Sci Sports Exerc. 2008 May;40(5):871–878.

Published In

Med Sci Sports Exerc

DOI

ISSN

0195-9131

Publication Date

May 2008

Volume

40

Issue

5

Start / End Page

871 / 878

Location

United States

Related Subject Headings

  • Sport Sciences
  • Oxygen Consumption
  • Male
  • Humans
  • Heart Rate
  • Female
  • Exercise
  • Double-Blind Method
  • Child
  • Caffeine