Dano muscular induzido pelo sistema de treinamento de cargas descendentes em exercício resistido

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TOGASHI, G. B. Muscle damage induced by drop set training system in resistance exercise. 2009. 112 p. Dissertation (Master) – Programa de PosGraduacao Interunidades Bioengenharia, EESC/FMRP/IQSC, Universidade de Sao Paulo, Sao Carlos, 2009. INTRODUCTION: Exercise-induced muscle damage (EIMD) in humans occurs after unaccustomed or vigorous exercise. Various experimental models was dedicated to EIMD, however few studies, essential those with eccentric actions, replicated actions that commonly occur during real physical training. PURPOSE: The general purpose of this research was to verify and to compare changes in indirect markers of muscle damage (Creatine Kinase (CK), myoglobin (Myo), pain and muscle torque) on the elbow flexors following training system of drop set in resistance exercise in two different intensities. METHODS: 9 young men (age: 26,78 ± 4,32 years, height: 181,33 ± 8,46 cm, body mass: 84,02 ± 13,88 kg) performed two exercise protocols of drop set resistance exercise with actions concentric and eccentric of the elbow flexors in Scott arm curl and direct arm curl of 90% (PROTOCOL 90%) and 75% (PROTOCOL 75%) of one maximal repeated. The indirect markers was obtained before, immediately after, and 24, 48, 96 and 168 hours after exercise. RESULTS: The CK’s concentration peak occurs 24 hours after exercise in both protocols, without any significant difference (p<0,05). The Myo’s concentration peak occurs 24 immediately after exercise in both protocols, without any significant difference (p<0,05). The pain peak occurs 24 hours after exercise of PROTOCOL 75% and continued in the same value 48 hours after, with pain perception of “pain a little strong”, indicated in Borg’s Scale. In the PROTOCOL 90% obtained a peak immediately after exercise with perception of “moderated pain”. The greater reduction of the muscle torque occurs immediately after exercise in both protocols, without any significant difference (p<0,05). CONCLUSION: It was possible suggest, through of indirect markers, that both protocols induced a muscle damage. The muscle torque shown to be a better marker of muscle damage because is a non-invasive way to evaluate the functionality of muscle structure. The PROTOCOL 90% seem to be more profitable in the practice because of magnitude pain perception.