Nicolas M. Philipp1, Jenna L. Carducci1, Matthew J. Garver1, Whitley J. Stone1, Meera Penumetcha1, Dustin W. Davis1, Adam R. McMillin1, Josie N. Hair1, Jordan R. Elledge1, Emily B. Sheck1, & Katherine M. Scherry1

1University of Central Missouri, Warrensburg, Missouri

Borg’s RPE Scale is commonly used to measure perceived exertion during exercise. Imposed exercise times, such as early morning or late evening, may impact perceived exertion. PURPOSE: Perceived exertion was recorded during maximal treadmill running to determine if there was a significant difference between extreme ends of the day. METHODS: Thirteen (Females: 8, Males: 5) recreationally trained individuals (Age: 20.7 ± 1.4 yrs.) underwent maximal testing on two occasions—a morning session (6:00-9:00) and an evening session (21:00-24:00). Prior to maximal testing, participants completed a familiarization trial purposed to limit learning effect and establish an individualized, comfortable jogging speed eliciting a steady-state RPE of 12-13 on the 6-20 Borg scale. Participants were provided a standardized meal (high CHO smoothie based on body weight and activity level) to be consumed 2h before testing. During maximal testing, participants maintained the constant jogging speed at the intensity determined during familiarization. Every 2 minutes, grade increased by 2% until volitional exhaustion. The RPE was recorded near the completion of each stage and immediately after termination of the test. RESULTS: The mean maximal test duration was 10.13 ± 2.15 minutes. A paired samples t-test indicated that maximal RPE did not differ (p = .25) between morning (18.9 ± 1.1) and evening (18.8 ± 1.5) tests. A paired samples t-test between session 1 and session 2 revealed an order effect (18.5 vs. 19.1, p = .047), with session 2 being perceived as exertionally more demanding. CONCLUSION: No difference was found in maximal RPE between the tests performed at 6:00-9:00 and 21:00-24:00. Interestingly, session 2 was perceived as more exertionally demanding when compared to session 1. These data support that there is no difference in maximal RPE when exercising at extreme ends of the day; however, recreationally trained individuals may perceive a maximal exercise test as more difficult if repeated within 36-72h.

ACKNOWLEDGEMENTS: This research was funded by the Graduate Student Research Fund from the University of Central Missouri.

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