The purpose of this study was firstly, to evaluate the power Output of leg extensor muscles in a Counter-movement Jump test (CMJ) and in a Squat jump test (SJ), in four groups of young women with different levels of physical activity. Secondly, to obtain power regression equations for the power developed in the CMJ, in the four groups. Forty-six young women volunteered for the study. They were divided into 4 groups: 12 elite Volleyball players (Elite); 13 club level Volleyball players from a national level team (Medium); 10 physical education students (Students); and 12 sedentary university students (Sedentary). Peak power values measured on the force platform (Elite: 2997 ± 420 W in CMJ and 3109 ± 420 W in SJ; Medium: 2856 ± 554 W in CMJ and 2879 ± 539 W in SJ; Students: 2415 ± 316 W in CMJ and 2423 ± 277 W in SJ; and Sedentary: 2400 ± 395 W in CMJ and 2322 ± 355 W in SJ) were greater than those assessed with the power equations in most cases. There were significant differences (P<0.001) between the power measured and estimated from the equations, in all except the Sayers equation in the CMJ. This equation was the most accurate, compared to the values measured on the force platform. As jump performance of the subjects increased, the equations underestimated less peak power. Further studies should determine power equations adapted to the characteristics of different groups from those analysed in this study.
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