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Titolo:
RECRUITMENT STABILITY IN MASSETER MOTOR UNITS DURING ISOMETRIC VOLUNTARY CONTRACTIONS
Autore:
SCUTTER SD; TURKER KS;
Indirizzi:
UNIV S AUSTRALIA,SCH PHYSIOTHERAPY,DEPT PHYSIOL ADELAIDE SA 5000 AUSTRALIA
Titolo Testata:
Muscle & nerve
fascicolo: 10, volume: 21, anno: 1998,
pagine: 1290 - 1298
SICI:
0148-639X(1998)21:10<1290:RSIMMU>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
MACRO-EMG; SIZE PRINCIPLE; BITE FORCE; TWITCH FORCES; JAW MUSCLES; THRESHOLD; DIRECTION; TENSION; ORDER; SLOW;
Keywords:
SINGLE MOTOR UNIT; MASSETER; RECRUITMENT; HUMAN; ELECTROMYOGRAPHY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
37
Recensione:
Indirizzi per estratti:
Citazione:
S.D. Scutter e K.S. Turker, "RECRUITMENT STABILITY IN MASSETER MOTOR UNITS DURING ISOMETRIC VOLUNTARY CONTRACTIONS", Muscle & nerve, 21(10), 1998, pp. 1290-1298

Abstract

Recruitment of single motor units (SMUs) of the masseter muscle was studied using macro representation (MacroRep) as the indicator of motorunit size. When subjects followed a slow isometric force ramp, units were usually recruited in order of MacroRep size. However, pooling thedata from repeated ramps in the same subject resulted in a weak relationship between MacroRep size and force recruitment threshold, probably due to marked variations in the relative contributions of the jaw muscles, and varying levels of cocontraction, in the development of total bite force in each ramp. The force recruitment thresholds of individual SMUs showed marked variability, but recruitment threshold stability was improved when expressed as a percentage of maximum surface electromyographic (SEMG) activity in the ipsilateral masseter. Therefore the SEMG recruitment threshold was concluded to be a more stable and accurate indicator of the SMU's position in the recruitment hierarchy in a given muscle. It was concluded that SMUs in masseter are recruited according to the size principle, and that when investigating recruitment in jaw muscles, SEMG recruitment threshold should be used in preference to force recruitment threshold. (C) 1998 John Wiley & Sons, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 05:09:19