[논문]Exercise induced muscle damage and recovery assessed by means of linear and non-linear sEMG analysis and ultrasonography

doi:10.1016/S1050-6411(00)00042-0

[해외논문] Exercise induced muscle damage and recovery assessed by means of linear and non-linear sEMG analysis and ultrasonography

Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology, v.11 no.2, 2001년, pp.73 - 83

Sbriccoli, P. (Department of Human Physiology and Pharmacology, Faculty of Medicine, Rome University “) , Felici, F. (La Sapienza”) , Rosponi, A. (, Piazzale Aldo Moro 5, 00185 Rome, Italy) , Aliotta, A. (Department of Human Physiology and Pharmacology, Faculty of Medicine, Rome University “) , Castellano, V. (La Sapienza”) , Mazzà, C. (, Piazzale Aldo Moro 5, 00185 Rome, Italy) , Bernardi, M. (Department of Human Physiology and Pharmacology, Faculty of Medicine, Rome University “) , Marchetti, M. (La Sapienza”)

Abstract ▼ AI-Helper

AbstractThis study was aimed at investigating the time-course and recovery from eccentric (EC) exercise induced muscle damage by means of surface electromyography (sEMG), ultrasonography (US), and blood enzymes. Five subjects (EC Group) performed two bouts of 35 EC maximum contractions with the biceps brachii of their non dominant arm, five subjects were tested without performing EC (Control Group: CNT). The maximal isometric force (MVC) was measured. Force and sEMG signals were recorded during 80% MVC isometric contractions. In EC and CNT subjects US assessment on non-dominant biceps brachii was performed; creatin kinase (CK) and lactic dehydrogenasis (LDH) plasma levels were also assessed. Force, sEMG and CK–LDH measurements were performed before EC and after it periodically for 4 weeks. The sEMG was analysed in time and frequency domains; a non-linear analysis (Lyapunov 1st exponent, L1) of sEMG was also performed. After EC, the MVC was reduced by 40% on average with respect to the pre-EC values. A significant decrease in the initial frequency content, and in the MDF and L1 decay (13–42% less than the pre-EC values, respectively) was also observed. The sEMG amplitude (Root Mean Square, RMS) was unchanged after EC. The US revealed an increase in muscle belly thickness and in local muscle blood flow after EC. A complete recovery of all the considered parameters was achieved in two weeks. In conclusion sEMG analysis was confirmed as an early indicator of muscle damage. Muscle recovery from damage is followed by both sEMG and US and this may have useful clinical implications. Non linear analysis (L1) was revealed to be sensitive to early sEMG modifications induced by EC as well as able to follow the post EC changes in the sEMG.

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DOI : 10.1016/S1050-6411(00)00042-0
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