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Changes in chest muscle thickness did not statistically differ between resistance training with 4-6 RPE and 7-9 RPE.
Practitioners may consider that varying proximity to failure in resistance training does not significantly affect muscle thickness outcomes.
StrongQualifiesmedium confidence
Equivalence testing confidence intervals crossed both g = 0.0 and g = ±0.20 thresholds; suggesting changes in chest MT did not statistically differ between 4-6 RPE and 7-9 RPE groups.
Why this rating
Based on study design from abstract.
Source
Effect Of Proximity To Failure During Resistance Training On Pectoralis Major Muscle Thickness
Seth R. Hinson et al. · Medicine & Science in Sports & Exercise · 2022
DOI 10.1249/01.mss.0000876256.44233.8d
rct · n=14
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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