The Relationship Between Subjective and Objective Intensity Across a Multiset Resistance Training Program

Area of Science:

• Exercise Physiology
• Sports Science
• Biomechanical Analysis

Background:

• Rate of perceived exertion (RPE) is a subjective measure used to gauge exercise intensity.
• Objective intensity in resistance training is typically defined by percentage of 1 repetition maximum (%1RM) or absolute load.
• Understanding the relationship between subjective and objective measures is crucial for effective training prescription.

Purpose of the Study:

• To investigate the relationship between RPE and objective intensity (relative %1RM and absolute load) across multiple sets, exercises, and training sessions.
• To determine if RPE is consistent across different exercises when prescribed at the same relative intensity.
• To identify factors influencing RPE during resistance training.

Main Methods:

• 104 subjects participated in 8 weeks of resistance training (3 sessions/week).
• Training involved 5-6 exercises at 50% or 80% of 1RM, across 2-3 sets for 6 or 14 repetitions.
• RPE was recorded post-set, and generalized estimating equation models analyzed relationships.

Main Results:

• Significant differences in RPE were observed between exercises, even at the same relative intensity (e.g., shoulder press: 17.2 ± 2.3 vs. calf raise: 13.3 ± 2.6).
• Objective relative intensity, set number, and repetition number significantly predicted RPE (p < 0.001).
• Higher relative intensities and fewer repetitions were associated with greater RPE.

Conclusions:

• A statistically significant relationship exists between RPE and objective measures like %1RM, sets, and repetitions.
• RPE is not consistent across different exercises at the same relative intensity prescription.
• %1RM prescription is suggested as the most appropriate method for ensuring a consistent training stimulus in resistance training programs.