ABSTRACT: Introduction: Alterations in surface electromyo- graphic (sEMG) signals of the abductor pollicis brevis muscle were evaluated in 24 non-manual workers and 40 manual work- ers (25 asymptomatic and 15 reporting CTS symptoms). Meth- ods: The initial value (IV) and the normalized rate of change (NRC) of average rectified value (ARV), mean frequency of the power spectrum (MNF), and muscle fiber conduction velocity (MFCV) were calculated during contractions at 20% and 50% of maximal voluntary contraction (MVC). Neuromuscular efficiency (NME) and kurtosis of the sEMG amplitude distribution were esti- mated. Results: With respect to controls, manual workers showed higher NME, lower ARV IV, and reduced myoelectric manifesta- tions of fatigue (lower MNF NRC for both contraction levels, and lower MFCV NRC at 50% MVC). Kurtosis at 20% MVC showed higher values in symptomatic manual workers than in the other two groups. Conclusions: Kurtosis seems to be a promising parameter for use in monitoring individuals who develop CTS.
Surface electromyography features in manual workers affected by carpal tunnel syndrome.
BONFIGLIOLI, ROBERTA;MUSSONI, PATRIZIA;VIOLANTE, FRANCESCO SAVERIO;
2012
Abstract
ABSTRACT: Introduction: Alterations in surface electromyo- graphic (sEMG) signals of the abductor pollicis brevis muscle were evaluated in 24 non-manual workers and 40 manual work- ers (25 asymptomatic and 15 reporting CTS symptoms). Meth- ods: The initial value (IV) and the normalized rate of change (NRC) of average rectified value (ARV), mean frequency of the power spectrum (MNF), and muscle fiber conduction velocity (MFCV) were calculated during contractions at 20% and 50% of maximal voluntary contraction (MVC). Neuromuscular efficiency (NME) and kurtosis of the sEMG amplitude distribution were esti- mated. Results: With respect to controls, manual workers showed higher NME, lower ARV IV, and reduced myoelectric manifesta- tions of fatigue (lower MNF NRC for both contraction levels, and lower MFCV NRC at 50% MVC). Kurtosis at 20% MVC showed higher values in symptomatic manual workers than in the other two groups. Conclusions: Kurtosis seems to be a promising parameter for use in monitoring individuals who develop CTS.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
