Relative contributions of force and velocity to peak power across a load spectrum

Andrew C Fry, Caryn E Bailey, Dimitrije Cabarkapa


Current resistance training controversies include whether to emphasize maximum force and strength, or to focus on velocity and movement speed. The purpose of this project was to determine the relative contributions of resistance exercise force and velocity to peak power. Weight trained men (X±SD; n = 24, age = 27.8±7.0 yrs) were tested for one repetition maximum (1 RM), peak power (PP), and force (F-PP) or velocity (V-PP) at peak power at 40%, 70% and 100% 1 RM. All lifts were performed on a 45° leg press equipped with a linear position transducer to determine kinetic and kinematic variables. Mean 1 RM leg press strength was 197±47 kg. Relative contributions of force and velocity to power at each intensity were determined using multiple linear regressions. Relative contributions of force and velocity to peak power at each intensity were as follows; 40% 1 RM - force = 47.0%, velocity = 53.0%, 70% 1 RM – force = 58.2%, velocity – 41.8%, 100% 1 RM – force = 45.1%, velocity = 54.9%. These data indicate the relative importance of force and velocity to peak power during the leg press exercise. Although the relative contributions change depending on the load, these data suggest that both qualities should be emphasized during training for high power.


kinematics; kinetics; resistance exercise


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