Abstract
The aim was to determine the position of the one-repetition maximum (1RM) squat point
on the force-velocity (F-V) relationship obtained during squat jump (SJ). Ten healthy
athletes performed a 1RM squat during which ground reaction force and lower-limb extension
velocity were measured, and six loaded SJs to determine individual F-V relationship.
The goodness of fit of the linear F-V relationship with or without the 1RM point was
tested. The vertical and horizontal coordinates were determined relative to the theoretical
maximal force (F0) and the highest loaded SJ (load of 44.5±4.6% 1RM). The goodness
of fit of the individual F-V relationship did not differ with or without the 1RM condition,
even if the 1RM point was slightly below the curve (−5±5%, P=0.018). The 1RM point
can be considered as a point of the F-V relationship. The velocity (0.22±0.05 m.s−1) of the 1RM point corresponded to ~30% of the velocity reached during the highest
loaded SJ. The force developed in the 1RM condition was ~16% higher than during the
highest loaded SJ and ~11% lower than F0. This finding underlines the difference between
F0 and the 1RM condition.
Key words
squat jump - maximal force capacities - ballistic movements - 1RM