Acceso usuarios
Alberto Melián Ortiz 
, David Varillas Delgado, Sofía Laguarta Val
Introduction The main objective of this study was to analyze more effective muscle work on some explosive strength performance variables. The secondary objectives were to determine how gender influences results and influence of the muscle work type on physiological parameters.
Material and method Randomized controlled trial single-blind clinical trial, allocated by blocks and by sex.
The study sample consisted of 80 healthy and active subjects divided into four muscle work groups: concentric, eccentric, concentric-eccentric and isometric.
4 sets of 12 repetitions, 1-min rest between series, were performed for dynamic workgroups. For the isometric work 6s with 20 rest. 12-min time in 12 consecutive days.
Results Main Outcomes Measures: sex, age, weight, height, body mass index, blood pressure and heart rate, jumping power, vertical jumping, horizontal jumping and speed 60m.
The concentric-eccentric group achieved the best results without statistically significant differences. The men improved the speed more by 60m. Women improved in jumping power, vertical jumping and horizontal jumping. Results were statistically significant if p<0.05.
Conclusions The group that performed the dynamic concentric-eccentric muscle work improved the performance variables analyzed further.
Women are equally improved by men and heart rate dropped to the same extent.
