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Titolo:
POWER SPECTRUM ANALYSIS OF THE RECTIFIED ELECTROMYOGRAM DURING GAIT FOR NORMALS AND PATIENTS
Autore:
NIELSEN J; ARENDTNIELSEN L; PEDOTTI A;
Indirizzi:
AALBORG UNIV,DEPT MED INFORMAT,MOTOR CONTROL LAB,FREDRIK BAJERSVEJ 7DDK-9220 AALBORG DENMARK POLITECN MILAN,FND PRO JUVENTUTE DON GNOCCHI,CTR BIOINGN I-20133 MILAN ITALY
Titolo Testata:
Journal of electromyography and kinesiology
fascicolo: 2, volume: 4, anno: 1994,
pagine: 105 - 115
SICI:
1050-6411(1994)4:2<105:PSAOTR>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
LINEAR ENVELOPES; EMG PROFILES; WALKING; KNEE;
Keywords:
GAIT; EMG; ENVELOPE; POWER SPECTRUM; CUTT-OFF FREQUENCIES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
20
Recensione:
Indirizzi per estratti:
Citazione:
J. Nielsen et al., "POWER SPECTRUM ANALYSIS OF THE RECTIFIED ELECTROMYOGRAM DURING GAIT FOR NORMALS AND PATIENTS", Journal of electromyography and kinesiology, 4(2), 1994, pp. 105-115

Abstract

The aim of the present study was to investigate the power spectrum ofthe rectified electromyographic (EMG) activity during gait in order to achieve an optimal cut-off frequency before calculating the EMG envelope. The frequency content of the rectified EMG signals was found to differ substantially between healthy subjects and patients. For the gastrocnemius lateralis muscle in young healthy subjects, 95% of the power was found to be below 3.8 Hz, whereas the 95% limit was 5.6 Hz for elderly subjects, 13.1 Hz for parkinsonians, and 11.5 Hz for patients with cerebellar ataxia. For the hamstring lateralis muscle, the 95% limit was 4.5 Hz for the young healthy subjects, 12.8 Hz for the elderlysubjects, 33.8 Hz for the parkinsonians, and 26.0 Hz for the cerebellar ataxia patients. This indicates that the low-pass cut-off frequencies generally used today (<3 Hz) for analysis of normal and pathologic gait are far too low. Individual filter setting is therefore recommended for both normals and the different groups of patients. For some frequencies of energy accumulation, we found a significant difference between the young subjects and either the elderly subjects or the parkinsonians. The power spectrum of the rectified EMG itself could thereforebe suggested as a tool to distinguish between normals and patients.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/04/20 alle ore 22:38:32