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Titolo:
A new approach of measuring muscle impairment during a functional task: Quadriceps muscle activity recorded during chair stand
Autore:
Brach, JS; Kriska, AM; Newman, AB; VanSwearingen, JM;
Indirizzi:
Univ Pittsburgh, Dept Phys Therapy, Pittsburgh, PA 15260 USA Univ Pittsburgh Pittsburgh PA USA 15260 Therapy, Pittsburgh, PA 15260 USA Univ Pittsburgh, Dept Epidemiol, Pittsburgh, PA 15260 USA Univ PittsburghPittsburgh PA USA 15260 idemiol, Pittsburgh, PA 15260 USA Univ Pittsburgh, Dept Med, Geriatr Med Sect, Pittsburgh, PA 15260 USA UnivPittsburgh Pittsburgh PA USA 15260 ed Sect, Pittsburgh, PA 15260 USA
Titolo Testata:
JOURNALS OF GERONTOLOGY SERIES A-BIOLOGICAL SCIENCES AND MEDICAL SCIENCES
fascicolo: 12, volume: 56, anno: 2001,
pagine: M767 - M770
SICI:
1079-5006(200112)56:12<M767:ANAOMM>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
RANDOMIZED EXERCISE TRIAL; OLDER WOMEN; YOUNG; GAIT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Social & Behavioral Sciences
Life Sciences
Citazioni:
14
Recensione:
Indirizzi per estratti:
Indirizzo: Brach, JS Univ Pittsburgh, Dept Phys Therapy, 6035 Forbes Tower, Pittsburgh, PA 15260 USA Univ Pittsburgh 6035 Forbes Tower Pittsburgh PA USA 15260 60 USA
Citazione:
J.S. Brach et al., "A new approach of measuring muscle impairment during a functional task: Quadriceps muscle activity recorded during chair stand", J GERONT A, 56(12), 2001, pp. M767-M770

Abstract

Background. Biologic changes are expected to occur prior to disability. Compared with physical disability measures, measures of muscle impairment maybe an earlier indicator of functional decline. The purpose of this study was to describe a new approach of measuring muscle impairment during a functional task. Methods. Right quadriceps muscle activity was recorded using surface electromyography (sEMG) from 160 older women (age 73.9 +/- 3.9 years, mean +/- SD). Specific patterns of muscle activity during the chair stand task were determined using an exploratory principal components factor analysis (PCFA). Muscle activity parameters were validated by comparison to the Physical Performance Test, gait speed, and the Functional Status Questionnaire. Results. The PCFA indicated two factors (magnitude and timing) that represented important components of quadriceps muscle activity during chair stand, explaining 68.67, of the variance in performance. The slope of the rise of muscle activity represents a combination of the magnitude and timing components of muscle activity. Compared with women with a slope <1. women with a slope greater than or equal to1 walked faster (1.17 m/s vs 1.09 m/s: p = .02) and reported less difficulty with activities of daily living (ADL) (98.6 vs 95.8 p = .003) and instrumental ADL (97.3 vs 92.2; p = .001). Conclusions. Quadriceps muscle activity recorded during chair stand is a valid and reliable measure of muscle performance during a functional task. As a biologic measure of muscle activation, sEMG may identify muscle impairment. which could indicate functional decline earlier than measures of functional status.

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Documento generato il 24/11/20 alle ore 11:08:54