Congruency and responsiveness of perceived exertion and time-to-end-point during an intermittent isometric fatigue task

Joseph Shepherd*, Nigel Gleeson, Claire Minshull

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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 languageEnglish
Pages (from-to)905-909
Number of pages5
JournalEuropean Journal of Applied Physiology
Volume113
Issue number4
DOIs
Publication statusPublished - 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

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