The TM SPV was as effective in eliciting an accurate VO2max as the Bruce protocol and did so with less incline and in less time suggesting that there are no changes in the limits of VO2max even when the test is self-paced and perceptually regulated.
Previous studies have shown that there are some changes in our perception of time during exercise, but the relationship between intensity level and these perceptions is unclear. Therefore, the purpose of this study was to determine the effect of exercise intensity on prospective time estimations. Twenty-two trained runners (10 male, 12 female; age 25±6 years) participated in three 30-minute treadmill runs that were perceptually regulated at rating of perceived exertion (RPE) levels of 13 ("somewhat hard"), 15 ("hard") and 17 ("very hard"). Prospective time assessments, in which subjects estimated durations of 1, 3, 7 and 20 seconds, were obtained immediately before exercise, during (at 10 min. and 20 min.) and after exercise. A 3 (RPE) x 4 (timepoint) x 4 (estimated duration) repeated measures ANOVA was completed. There was a significant main effect of RPE level (p=.013). Post hoc tests revealed that time estimations at RPE17 were significantly lower than those at RPE13 (p=.021). The main effects of timepoint and estimated duration were not significant (both p≥.05), and no interactions were present. However, there was a trend for time estimations to decrease in all conditions as exercise progressed, with a rebound after cessation of exercise. This study showed a clear effect of exercise intensity on time perception. Specifically, the subjects perceived time to pass by more slowly as intensity increased.
The pacing strategy that is implemented in the last 2 min of an SPV on a treadmill does not affect the maximal oxygen consumption that is elicited during that test. Either pacing strategy can be used for this protocol without compromising the results, when [Formula: see text] is the variable of interest.
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