Systematic Reductions in Differential Ratings of Perceived Exertion Across a 2-Week Repeated-Sprint-Training Intervention That Improved Soccer Players’ High-Speed-Running Abilities

To quantify changes in differential ratings of perceived exertion (dRPE) across a 2-wk repeated-sprint-training intervention that improved high-intensity intermittent-running ability and linear speed of semiprofessional soccer players. Thirteen players completed 3 (sessions 1–3) or 4 (sessions 4–6) sets of 7 sprints (group 1 [n = 7]: 30-m straight; group 2 [n = 6]: 2 × 10-m shuttle), with 20 s and 4 min of recovery between sprints and sets, respectively. Postset perceptions of breathlessness (RPE-B) and leg-muscle exertion (RPE-L) were rated using the CR100 scale. Overall, RPE-B (mean [SD]: 46 [13] arbitrary units [AU], “hard”) was most likely higher than RPE-L (39 [13] AU, “somewhat hard,” mean difference: 8 AU; 90% confidence limits [CLs]: ±2). Set-to-set increases in dRPE (in AU; 90% CL: approximately ±2) were large in session 1 (RPE-B: 15; RPE-L: 14), moderate in sessions 2–5 (RPE-B: 7–10; RPE-L: 7–8), and small (RPE-B: 6) to moderate (RPE-L: 7) in session 6. Across the intervention, RPE-B reduced moderately in sets 3 (−13; 90% CL: ±4) and 4 (−12; 90% CL: ±12) and RPE-L reduced by a small magnitude in set 3 (−5; 90% CL: ±6). The set 4 change in RPE-L was unclear (−11; 90% CL: ±13). Conclusions The authors observed systematic intrasession and intersession changes in dRPE across a 2-wk repeated-sprint-training intervention, with a fixed prescription of external load that improved semiprofessional soccer players’ high-speed-running abilities. These findings could support dRPE as a measure of internal load and highlight its usefulness in evaluating repeated-sprint-training dose–response.