Exercise Endurance 1, 3, and 6 h after Caffeine Ingestion in Caffeine Users and Nonusers

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Authors
  1. Bell, D.G.
  2. McLellan, T.M.
Corporate Authors
Defence R&D Canada - Toronto, Toronto ONT (CAN)
Abstract
The purpose of the present study was to examine the duration of caffeine's ergogenic effect and whether it differs between users and nonusers of the drug. Twenty-one subjects (13 caffeine users and 8 nonusers) completed six randomized exercise rides to exhaustion at 80% of maximal oxygen consumption after ingesting either a placebo or 5 mg/kg of caffeine. Exercise to exhaustion was completed once per week at either 1, 3, or 6 h after placebo or drug ingestion. Exercise time to exhaustion differed between users and nonusers with the ergogenic effect being greater and lasting longer in nonusers. for the nonusers, exercise times 1, 3, and 6 h after caffeine ingestion were 32.7 + or - 8.4, 32.1 + or - 8.6, and 31.7 + or - 12.0 min, respectively, and these values were each significantly greater than the corresponding placebo values of 24.2 + or - 6.4, 25.8 + or - 7.8, and 24.5 + or - 7.6 min, respectively. Only exercise times 1 and 3 h after drug ingestion were significantly greater than the respective placebo trials of 23.3 + or - 6.5, 23.2 + or - 7.1, and 23.5 + or - 5.7 min. In conclusion, both the duration and magnitude of the ergogenic effect that followed a 5 mg/kg dose of caffeine were greater in the nonusers compared with the users.
Keywords
Ergogenic aids;Physical training;Ergogenic effects;Human performance;Drug tolerance
Report Number
DRDC-TORONTO-SL-2002-036 — Scientific Literature
Date of publication
01 Jan 2003
Number of Pages
8
Reprinted from
J Appl. Physiol, vol 93, 2002, p 1227-1234
DSTKIM No
CA021777
CANDIS No
518499
Format(s):
Hardcopy

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