Abstract / Description of output
The aims of this study were (1) to investigate the relationship between self-perception of effort and task duration in an intermittent isometric fatigue trial (IIF) and (2) to evaluate the capability of two assessment paradigms (perceived exertion; perceived task duration) to reflect changes in IIF intensity. Fifteen participants performed two IIF tasks of the knee extensors at intensities of 60 and 70 % of daily peak force, each separated by 48-72 h. Ordering of the tasks was counter-balanced and participants were blinded to the precise intensity of each IIF. A category-ratio scale (CR-10) and visual analogue scale were used during each IIF task to record measures of perceived exertion and perceived task duration, respectively. Measures were recorded at 10 % intervals across the relative duration of each IIF task. Pearson product-moment correlation coefficients revealed strong positive correlations (r > 0.99; p <0.01) between completed task duration and both perceptual scales at the two IIF intensities. Separate two-way repeated measures ANOVAs of CR-10 and perceived task duration responses revealed significant main effects for time only (F ([2.2,30.1]) = 126.8; p <0.001; F ([2.6,36.8]) = 117.2; p <0.001, CR-10 and perceived task duration, respectively). The results suggest that perceived exertion and perceived task duration are equally effective predictors of IIF end-point. However, neither measure was sufficiently responsive to discriminate between 10 % changes in exercise intensity.
Original language | English |
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Pages (from-to) | 905-909 |
Number of pages | 5 |
Journal | European Journal of Applied Physiology |
Volume | 113 |
Issue number | 4 |
DOIs | |
Publication status | Published - Apr 2013 |
Keywords / Materials (for Non-textual outputs)
- Perceived exertion
- Isometric
- Deception
- Knee extensors
- CONSTANT-LOAD EXERCISE
- ONE REPETITION MAXIMUM
- QUADRICEPS
- DURATION
- MEN
- CONTRACTIONS
- PERFORMANCE
- PERCENTAGES
- PERCEPTION
- VOLUNTARY