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The influence of exercise-induced muscle damage in the responsiveness to the post-activation potentiation: a study from countermovement jump

Grant number: 18/05671-4
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): August 01, 2018
Effective date (End): December 31, 2019
Field of knowledge:Health Sciences - Physical Education
Principal Investigator:Leonardo Coelho Rabello de Lima
Grantee:Victor Alvino de Souza
Home Institution: Instituto de Biociências (IB). Universidade Estadual Paulista (UNESP). Campus de Rio Claro. Rio Claro , SP, Brazil

Abstract

It is known that muscles with higher incidence of type II muscle fibers are more responsive to post-activation potentiation (PAP). However, these muscles also appear to be more susceptible to muscle damage induced by exercise pliometric. Considering that both the PAP and muscle damage induced by exercise are more commonly observed in type II muscle fibers, the objective of this study is to evaluate whether the muscle damage induced by contractions pliometrics interferes in the production capacity of the strength and power of the muscles of the lower limbs (in particular, the knee extensors), induced by a preconditioning protocol. Men assets, without recent experience with resistance training and without a history of lesions in the limbs, will participate in the study. The preconditioning protocol will be characterized by a series of five squats at high intensity. After four minutes of series of preconditioning, the participants will hold CMJ and maximal isometric contractions in the isocinetic dynamometer to identify the effects of PAP. Fifteen minutes after the exercise of induction of PAP, the same conduct a protocol for induction of muscle damage, which will consist of repetitions of drop-jumps (DJ) with overload. Ten minutes after the exercise-induced muscle damage the participants will hold back the performance tests described above. The assessments of peak torque and height of CMJ (both under the effect of PAP and in basal conditions) will be carried out, also, 24 and 48 hours after the induction of muscle damage. (AU)