Reliability of the Brzycki Formula to Estimate 1RM Bench Press and Half-Squat Between Collegiate Men and Women

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BACKGROUND: The determination of the 1-repetition maximum (1RM) is one of the most frequently performed evaluations to assess maximal dynamic strength in athletes. Several formulas have been proposed to estimate the 1RM. The objective of this study was to compare 1RM measurement with a 1RM estimate obtained from the Brzycki formula to estimate 1RM bench press and half-squat between young men and women. METHODS: Forty-six male and 15 female sport sciences undergraduates performed 3RM in bench press and 3RM in half-squat. in two sessions. In different days, participants performed the 1RM test of each exercise. A two-way (gender x exercise) ANOVA was applied to analyze the difference between the estimate and the actual 1RM. The level of significance set for the study was P<0.05. RESULTS: Differences (P<0.001) between the estimate and the 1RM was found both in half-squat (9.3±11.1 kg) and bench press (4.6±6.2 kg) for both the whole group. No significant differences were found in the interaction gender x exercise, not in absolute terms (P=0.23; partial η2=0.01) or in percentage (P=0.34; partial η2=0.007). CONCLUSIONS: Estimating 1RM by Brzycki formula according to how it has been conducted in this study is not different in young men and women in relation to the exercise performed: half-squat and bench press. However, the estimate was different from the actual 1RM for both exercises.