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Influence of Inquiry Frequency on Ratings of Perceived Exertion during Graded Exercise Testing
( Sung Hee Han ),( Mitchell H. Whaley ),( Leonard A. Kaminsky ) 한국스포츠정책과학원(구 한국스포츠개발원) 2001 International Journal of Applied Sports Sciences Vol.13 No.2
Procedures for use of the Borg rating of perceived exertion scale (RPE) during graded exercise testing (GXT) vary from inquiries made once per exercise stage to as frequently as every minute during the test. However, previous studies assessing the reliability of the scale during GXTs suggest that inquiry frequency may influence RPEs at fixed submaximal exercise levels. The purpose of this study was to further examine the effect of inquiry frequency on RPEs during maximal GXT on a treadmill (TM). Fifteen young men and women were randomly assigned to complete two GXTs within 48 hours using the standard Bruce protocol. RPE queries were made either once per stage (RPE-S) or once per minute (RPE-M). Heart rate, oxygen uptake, minute ventilation and respiratory exchange ratio were compared across GXTs at the end of each submaximal stage and peak exercise using repeated-measures ANOVA. No differences were observed between the GXTs for any physiological measures during submaximal or peak exercise. Peak RPEs were not different between the GXTs (19.1 ±0.9 vs. 19.0±0.7). However, RPEs were significantly higher (p<0.01) at each submaximal stage during the RPE-M condition. Oxygen uptakes at Bruce protocol stages I, II and III represented 40, 58 and 81 percent of VO2 peak, respectively, so RPE differences have practical implications at exercise intensities within the typical exercise training range. More frequent RPE inquiries may serve to reinforce an internal attentional focus during the exercise test and thus contribute to the higher RPEs. These data confirm that inquiry frequency can significantly influence submaximal RPE responses during GXTs and therefore, RPE inquiry methods should be standardized when data are collected for serial comparative purposes.