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Titolo:
SURFACE EMG MODIFICATIONS AFTER ECCENTRIC EXERCISE
Autore:
FELICI F; COLACE L; SBRICCOLI P;
Indirizzi:
UNIV ROMA LA SAPIENZA,IST FISIOL UMANA,FAC MED & CHIRURG,PIAZZALE ALDO MORO 5 I-00185 ROME ITALY UNIV ROMA LA SAPIENZA,FAC MED,INST HUMAN PHYSIOL ROME ITALY IRCCS,REHABIL HOSP ROME ITALY
Titolo Testata:
Journal of electromyography and kinesiology
fascicolo: 3, volume: 7, anno: 1997,
pagine: 193 - 202
SICI:
1050-6411(1997)7:3<193:SEMAEE>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
INDUCED MUSCLE DAMAGE; POWER SPECTRA; MOTOR UNITS; ADAPTATION; CONTRACTIONS; RECRUITMENT; FORCE; ELECTROMYOGRAM; FATIGUE; INJURY;
Keywords:
MUSCLE DAMAGE; BICEPS BRACHII; SURFACE ELECTROMYOGRAPHY; MEDIAN FREQUENCY; SPECTRAL COMPRESSION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
24
Recensione:
Indirizzi per estratti:
Citazione:
F. Felici et al., "SURFACE EMG MODIFICATIONS AFTER ECCENTRIC EXERCISE", Journal of electromyography and kinesiology, 7(3), 1997, pp. 193-202

Abstract

The possibility that the surface electromyographic signal (sEMG) fromexercised muscle would show significant changes to demonstrate muscledamage after eccentric contraction (EC) was tested in this study. Theexperiment lasted five consecutive days. On the first day, six sedentary adult subjects performed two rounds of 35 ECs with the biceps brachii of the non-dominant arm, the other arm being used as control. Individual muscle soreness was assessed on a subjective scale. The analysis of sEMG was performed on the signal recorded during isometric contractions at 80% and 50% of maximal voluntary contraction (MVC), choosingroot mean square (RMS) and median frequency (MDF) as synthetic sEMG parameters. MVC was also recorded, and plasma levels of creatine kinasewere determined in four subjects. The most important findings which resulted from this study were: (a) spectral parameters are less sensitive to error introduced by electrode repositioning than time domain parameters, and are more sensitive to EC-induced sEMG changes than RMS; (b) a significant shift of MDF power spectra towards low frequencies at80% and 50% MVC (20% and 5% of decay, respectively) aias evident as early as Ih after EC on the exercised arm; and (c) MDF follows the evolution of muscle damage. We concluded from these results that MDF is suitable for the early and non-invasive detection of sEMG changes induced by EC. In addition, we found further evidence that the observed modifications result from a selective or prevalent damage of type 2B muscle fibres. (C) 1997 Elsevier Science Ltd.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 22:47:28