Research
Mixed
The one-repetition maximum (1RM) test demonstrates good-to-excellent test-retest reliability across diverse populations, exercise types, and training statuses, making it a valid tool for assessing muscular strength.
Use the 1RM test to measure your maximum strength. It is a reliable tool regardless of your gender, age, or training experience. You do not need multiple familiarization sessions to get a reliable result, and it works for both upper and lower body exercises. Trust the numbers, as they are consistent.
StrongSupportsVERY_HIGH confidence
Based on the results of this review, it can be concluded that the 1RM test generally has good to excellent test–retest reliability, regardless of resistance training experience, number of familiarization sessions, exercise selection, part of the body assessed (upper vs. lower body), and sex or age of participants.
Why this rating
Systematic review of 32 studies with a pooled sample of 1595 participants, all rated moderate or excellent methodological quality.
Source
Test–Retest Reliability of the One-Repetition Maximum (1RM) Strength Assessment: a Systematic Review
Jozo Grgić et al. · Sports Medicine - Open · 2020
systematic_review · n=1595Cited 350×
Read the paper This is one finding among thousands. Every one is graded and traced to its source, so you can see what the evidence actually supports. Browse the research →