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

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Authors
  1. Bell, D.G.
  2. Jacobs, I.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
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
Keywords
Ergogenic effects;Ergogenic aids
Report Number
DCIEM-97-P-39 — Reprint
Date of publication
01 Apr 1999
Number of Pages
8
Reprinted from
Aviation, Space and Envrionmental Medicine, vol 70, no 4, 1999, p 325-329
DSTKIM No
99-01003
CANDIS No
510913
Format(s):
Hardcopy;Document Image stored on Optical Disk

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