Abstract

The purpose of this investigation was to examine differences in ratings of perceived exertion (RPE) at equivalent percentages of subjects maximal work capacity (equivalent relative workloads), before and after endurance training. Experimental (N = 13) and control (N = 13) groups, comprised of healthy male subjects (age = 21.2 years, VO2 max = 50.4 ml/kg/min) volunteered to participate in this study. All subjects completed progressive treadmill tests at approximately the same time of day, prior to and at the termination of the 9-week period. The treadmill protocol consisted of running at 8km/hr and increasing the speed 0.8km/hr per min until volitional fatigue. Values for RPE were obtained at 30-second intervals during the run. The exercise program consisted of treadmill running, 3 days per week, at workloads which were systematically progressed. Statistical analysis to measure changes in RPE over time was performed utilising a 2x2x5 anova (groups x pre-post x relative workload) with repeated measures on the third factor. Reductions in RPE averaged 14 and 17 at a given VO2 and velocity, respectively, in the training group. The responses were of a linear fashion. At equivalent relative workloads, again for the training group, decreases in RPE averaged 7.2 for VO2 and 12.8 for velocity. When modifications in RPE in the control group were considered, the changes in RPE in the training group were not significant. It was concluded that the influence of training upon RPE at relative workloads is dependent upon the magnitude of corresponding physiological adaptations. The results also support the view that the changes in RPE which become apparent with training are potentially related to the method of analysis. Verf.-Referat