Heavy-intensity aerobic exercise affects the isokinetic torque and functional but not conventional hamstrings:quadriceps ratios
Nenhuma Miniatura disponível
Data
2009-12-01
Autores
Castelo Oliveira, Anderson de Souza [UNESP]
Caputo, Fabrizio [UNESP]
Goncalves, Mauro [UNESP]
Denadai, Benedito Sergio [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Elsevier B.V.
Resumo
Running exercises are frequently related to muscular injuries, which may be a result of muscular imbalance. The present study aimed to verify the effects of heavy-intensity continuous running exercise on the functional and conventional hamstrings: quadriceps ratios, and also in the knee flexors and extensors EMG activity in active non-athletic individuals. Sixteen active males performed maximal isokinetic concentric and eccentric knee flexions and extensions at 60 degrees s(-1) and 180 degrees s(-1). In another session, the same procedure was conducted after a continuous running exercise at 95% onset of blood lactate accumulation. Torque and electromyographic ratios were calculated from peak torque and integrated electromyographic activity (knee flexor and extensors). Creatine kinase was measured before and 24 h after running exercise. Eccentric torque (knee flexion and extension) decreased significantly after running only at 180 degrees s(-1) (p < 0.05). No differences were found for the conventional torque ratios (p > 0.05), however, the functional torque ratios at 180 degrees s(-1) decreased significantly after running (p < 0.05). No effects on the electromyographic activity and electronnyographic ratios were found (p > 0.05). Creatine kinase increased slightly 24 h after running (p < 0.05). Heavy-intensity continuous running exercise decreased knee flexor and extensor eccentric torque, and functional torque ratios under fast velocities (180 degrees s(-1)), probably as result of peripheral fatigue. (C) 2008 Elsevier Ltd. All rights reserved.
Descrição
Palavras-chave
Running, Joint balance, Fatigue, Concentric, Eccentric
Como citar
Journal of Electromyography and Kinesiology. Oxford: Elsevier B.V., v. 19, n. 6, p. 1079-1084, 2009.