K.J. Whitney-Babcock, A.J. Seipel, J.M. Schuna, Jr., A.J. Taylor, J.T. Penry

Oregon State University, Corvallis, OR

Session rating of perceived exertion (sRPE) is a valid and reliable method for tracking training load. Traditionally, sRPE has used the CR-10 scale to quantify session intensity. Newer training applications have calculated sRPE using a perceived exertion scale (Global Session Metric score, GSMs) that has not been validated against the CR-10. If RPE values produced by GSMs and the CR-10 differ at similar workloads, data collected using GSMs may not be directly comparable to previously established CR-10 values. PURPOSE: To determine if GSMs and the CR-10 provide similar values for sRPE at three heart rate reserve (HRR) work intensities in recreationally active adults. METHODS: 26 recreationally active adults (12M/14F) average age 23.81 years (SD=5.43) completed the study. Each participant completed three treadmill testing sessions: an initial VO2max testing session to determine three HRR work intensities, and two subsequent visits consisting of three constant effort trials at the three work intensities (easy, moderate, hard; wINT). wINT were randomized for the first set of trials and matched for the second three trials. The same researcher used the GSMs or CR-10 scale (SCALE) to determine RPE following each trial, with only one RPE scale used for each testing session, and the order of scale presentation randomized between sessions. A 2-way repeated measures ANOVA was used to examine the effects of SCALE and wINT on trial RPE (tRPE). Tukey post-hoc comparisons were used to assess differences in tRPE for SCALE at different wINT. RESULTS: Both wINT (F(2,50) = 146.0, p < 0.001) and SCALE (F(1,25) = 53.8, p < 0.001) showed a significant main effect on tRPE. The wINT:SCALE interaction effect was also significant (F(2,50) = 6.2, p=0.004), with tRPE higher for GSMs than for the CR-10 at both moderate (GSMs: 4.2 ± 0.2 vs. CR-10: 3.2 ± 0.2, p < 0.001) and hard wINT (GSMs: 6.7 ± 0.2 vs. CR-10: 5.4 ± 0.3, p < 0.001). tRPE at easy wINT was not significantly different between GSMs and CR-10 (p=0.197). CONCLUSION: At both moderate and hard wINT, GSMs returns higher RPE values than the CR-10, with the mean difference between GSMs and the CR-10 larger at greater workloads. Caution should be used when comparing sRPE values derived from GSMs to those using the CR-10, as sRPE from GSMs data are likely inflated for the same subjective work intensity.

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