Combined Caffeine and Ephedrine Ingestion Improves Run Times of Canadian Forces Warrior Test


  1. Bell, D.G.
  2. Jacobs, I.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
The ingestion of a combination of caffeine (C) and ephedrine (E) has been reported to prolong exercise time to exhaustion during cycle ergometry at 8% VO2max. The present study was undertaken to investigate whether this enhancement would occur in a field setting and if drug ingestion and 1 d would afect performance 1 d later. Two hours after ingesting either a combination of 375 mg of C and 75 mg E (C+E), or a placebo (P), 9 healthy male recreational runners completed six balanced and double-blind trials of the Canadian Forces Warrior Test (WT), a 3.1 km run wearing "fighting order" which weighed about 11 kg. The trials were performed in sets of two runs, i.e., two runs were done 24 h apart, and these sets were separated by a minimum of 7 d. The sets were: C+E trial on day 1 (D1), placebo on day 2 (P2); placebo first (P1), C+E second (D2); and placebo first (P3), placebo second (P4). In addition, 1 wk before the treatment trials the subjects performed a control trial WT. During the WT, heart rates (HR) were recorded every minute. Plasma C and E levels immediately before the WT were similar for both C+E trails, but were undetectable for all P trials. Run times (mean + or - SD) were 15.3 + or - 0.6, 15.4 + or - 0.9, 15.5 + or - 1.2, 15.4 + or - 0.9, 15.4 + or - 0.9, 14.8 + or - 0.7, and 14.6 + or - 0.8 min for control, P1, P2, P3, P4, D1, D2 trials, respectively. TRUNCATED
Ergogenic effects;Ergogenic aids
Report Number
DCIEM-97-P-39 — Reprint
Date of publication
01 Apr 1999
Number of Pages
Reprinted from
Aviation, Space and Envrionmental Medicine, vol 70, no 4, 1999, p 325-329
Hardcopy;Document Image stored on Optical Disk

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