Use of force–velocity relationship to estimate the one-repetition maximum leg press exercise among young females

Abstract

[Purpose] This study aimed to determine the concurrent validity of using force at a velocity of 0 m/s when estimating the one-repetition maximum leg press and develop and assess the accuracy of an equation to estimate the one-repetition maximum value. [Participants and Methods] Ten untrained healthy females participated. We directly measured the one-repetition maximum during the one leg press exercise and developed the individual force-velocity relationship using the trial with the highest mean propulsive velocity at 20% and 70% of the one-repetition maximum. We then used the force at a velocity of 0 m/s to estimate the measured one-repetition maximum. [Results] The force at a velocity of 0 m/s was strongly correlated with the measured one-repetition maximum. A simple linear regression analysis revealed a significant estimated regression equation. The multiple coefficient of the determination of this equation was 0.77, while the standard error of the estimate of the equation was 12.5 kg. [Conclusion] The estimation method based on the force-velocity relationship was highly valid and accurate at estimating the one-repetition maximum for the one leg press exercise. The method provides valuable information to instruct untrained participants at the start of resistance training programs.