Shepherd, J and Gleeson, Nigel and Minshull, Claire (2013) Congruency and responsiveness of perceived exertion and time-to-end-point during an intermittent isometric fatigue task. European Journal of Applied Physiology, 113 (4). pp. 905-909. ISSN 1439-6319
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Official URL: http://dx.doi.org/10.1007/s00421-012-2496-4
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 70Â % of daily peak force, each separated by 48-72Â 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 10Â % intervals across the relative duration of each IIF task. Pearson product-moment correlation coefficients revealed strong positive correlations (rÂ >Â 0.99; pÂ <Â 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]Â =Â 126.8; pÂ <Â 0.001; F [2.6,36.8]Â =Â 117.2; pÂ <Â 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 10Â % changes in exercise intensity. Â© 2012 Springer-Verlag.
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