Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine ( 2015 ) 14 , 322 - 332

Research article
Effects of Time-Release Caffeine Containing Supplement on Metabolic Rate, Glycerol Concentration and Performance
Adam M. Gonzalez, Jay R. Hoffman , Adam J. Wells, Gerald T. Mangine, Jeremy R. Townsend, Adam R. Jajtner, Ran Wang, Amelia A. Miramonti, Gabriel J. Pruna, Michael B. LaMonica, Jonathan D. Bohner, Mattan W. Hoffman, Leonardo P. Oliveira, David H. Fukuda, Maren S. Fragala, Jeffrey R. Stout
Author Information
Institute of Exercise Physiology and Wellness, Sport and Exercise Science, University of Central Florida, Orlando, FL USA

Jay R. Hoffman
✉ Sport and Exercise Science, University of Central Florida, College of Education & Human Performance, P.O. Box 161250, Orlando, FL, USA
Email: jay.hoffman@ucf.edu
Publish Date
Received: 15-12-2014
Accepted: 17-02-2015
Published (online): 01-06-2015
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ABSTRACT

This study compared caffeine pharmacokinetics, glycerol concentrations, metabolic rate, and performance measures following ingestion of a time-release caffeine containing supplement (TR-CAF) versus a regular caffeine capsule (CAF) and a placebo (PL). Following a double-blind, placebo-controlled, randomized, cross-over design, ten males (25.9 ± 3.2 y) who regularly consume caffeine ingested capsules containing either TR-CAF, CAF, or PL. Blood draws and performance measures occurred at every hour over an 8-hour period. Plasma caffeine concentrations were significantly greater (p < 0.05) in CAF compared to TR-CAF during hours 2-5 and significantly greater (p = 0.042) in TR-CAF compared to CAF at hour 8. There were no significant differences between trials in glycerol concentrations (p = 0.86) or metabolic measures (p = 0.17-0.91). Physical reaction time was significantly improved for CAF at hour 5 (p=0.01) compared to PL. Average upper body reaction time was significantly improved for CAF and TR-CAF during hours 1-4 (p = 0.04 and p = 0.01, respectively) and over the 8-hour period (p = 0.04 and p = 0.001, respectively) compared to PL. Average upper body reaction time was also significantly improved for TR-CAF compared to PL during hours 5-8 (p = 0.004). TR-CAF and CAF showed distinct pharmacokinetics yielding modest effects on reaction time, yet did not alter glycerol concentration, metabolic measures, or other performance measures.

Key words: Caffeine bioavailability, energy, multiple object tracking, pharmacokinetics, reaction time, sustained release caffeine


           Key Points
  • Time-release caffeine and regular caffeine showed distinct pharmacokinetics over an 8-hour period following ingestion.
  • Time-release caffeine and regular caffeine yielded modest effects on reaction time over an 8-hour period following ingestion.
  • Time-release caffeine and regular caffeine did not alter glycerol concentration, metabolic measures, or other performance measures over an 8-hour period following ingestion.
 
 
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