VARIABILITY OF TIME TO EXHAUSTION DURING SUBMAXIMAL EXERCISE

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Authors
  1. McLellan, T.M.
  2. Cheung, S.S.
  3. Jacobs, I.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
Exercise time to exhaustion (TE) is commonly used to evaluate the success or failure of such treatments as endurance training programs or nutritional supplements. The present study determined the variability of TE during submaximal exercise at 80% VO2max. Fifteen males performed cycle exercise to exhaustion on five occasions at the same time of day with a minimum of 72 hrs between sessions. There was no difference in TE (0.1 > p > 0.05) among the trials, with values ranging from 14.4 + or - 1.1 min for Test 1 to 18.2 + or - 2.4 min during the final test. Substantial variability in TE over th efive trials was observed among subjects with coefficients of variation (CV) ranging from 2.8 to 31.4%. Subjects were divided into two groups using the median CV for TE. For the low CV group (n = 8), TE was significantly increased during Test 3 (14.9 + or - 1.3 min) compred with Test 1 (12.8 + or - 1.0 min) and test 5 (12.5 + 1.2 min). For the high CV group (n = 7), TE was increased during Test 5 (24.7 + or - 3.7 min) compared with the other tests (18.5 + or - 2.2 min). CV for VO2, Vg, pH, PCO2, and rectal temperature were less than 5% and did not differ between groups. Post hoc power calculations revealed that if all subjects were considered as one group, sample size would have to increase to 40 to increase the power to 0.8. TRUNCATED
Keywords
Endurance training;Physical work capacity;Time to exhaustion (TE)
Report Number
DCIEM-94-02 — Reprint
Date of publication
01 Jan 1994
Number of Pages
14
Reprinted from
Can J Appl Physiol, vol 20, no 1, 1995, p 39-51
DSTKIM No
95-03642
CANDIS No
152003
Format(s):
Document Image stored on Optical Disk;Hardcopy

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