Causal influences of expected running length on ratings of perceived exertion and estimation time limit scales

OBJECTIVES: 1) To confirm that the Ratings of Perceived Exertion (RPE) and Estimated Time Limit (ETL) are specifically influenced by expected running length, and 2) to investigate the factors that contribute to this potential response (exercise end-point anticipation and/or announcement to continue running). Method: Two homogenous groups performed two trials: a test at 90% maximal aerobic velocity (MAV) for 80% Time limit (Tlim) and a test at 90% MAV for 80% Distance limit (Dlim). Although one group received correct feedback concerning the exercise endpoint (90% MAV for 80% Tlim/Dlim), the other group were deceived as they were informed that they would maintain 90% MAV for 60% Tlim/Dlim. RPE and ETL were collected. Results: The expected running length significantly influenced ETL, but only a trend was observable for RPE. This effect does not seem to be linked explicitly with the anticipation of the expected exercise endpoint, or with the deception linked to the announcement to continue running, but rather with a combination of these two parameters. CONCLUSION: This response seems to be linked with a combination of both the exercise endpoint anticipation and the announcement to continue running.