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Related Experiment Video

Updated: Jun 28, 2026

Conducting Maximal and Submaximal Endurance Exercise Testing to Measure Physiological and Biological Responses to Acute Exercise in Humans
07:26

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Published on: October 17, 2018

Regulating intensity using perceived exertion: effect of exercise duration.

Jie Kang1, Edward C Chaloupka, Gregory B Biren

  • 1Department of Health and Exercise Science, The College of New Jersey, Ewing, NJ 08628, USA. kang@tcnj.edu

European Journal of Applied Physiology
|November 13, 2008
PubMed
Summary

This study found that exercise duration minimally impacts the accuracy of using ratings of perceived exertion (RPE) to regulate exercise intensity. Perceived exertion effectively guides exercise intensity across different durations.

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Human Performance

Background:

  • Accurate exercise intensity regulation is crucial for training efficacy and physiological adaptation.
  • Ratings of Perceived Exertion (RPE) offer a subjective method for monitoring exercise intensity.
  • The influence of exercise duration on the validity of RPE-based intensity control requires further investigation.

Purpose of the Study:

  • To determine if exercise duration affects the accuracy of using RPE to regulate exercise intensity.
  • To assess the reliability of RPE for targeting specific metabolic demands (50% and 75% VO2peak) over varying exercise durations (20 and 40 minutes).

Main Methods:

  • Twenty participants completed a maximal graded exercise test (GXT) to establish physiological parameters.
  • Submaximal trials involved participants regulating workload based on RPE estimations at 50% and 75% VO2peak for 20 or 40 minutes.
  • Physiological measures including oxygen uptake (VO2), heart rate (HR), and power output (PO) were continuously monitored.

Main Results:

  • No significant differences in average oxygen uptake (VO2) were observed between RPE-guided intensity production and target estimations.
  • Average heart rate (HR) and power output (PO) were significantly lower during the RPE-guided production trials compared to target estimations (P < 0.05).
  • Exercise duration demonstrated a minimal effect on the accuracy of RPE for regulating metabolic demand.

Conclusions:

  • RPE serves as a valid tool for regulating exercise intensity, even over extended durations.
  • The findings suggest that RPE-based training can be reliably implemented across various exercise lengths.
  • Exercise duration has a limited impact on the perception-intensity relationship during submaximal exercise.