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A new approach of measuring muscle impairment during a functional task: quadriceps muscle activity recorded during chair stand.
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A new approach of measuring muscle impairment during a functional task: quadriceps muscle activity recorded during chair stand.

著者: JS Brach 附属: Department of Physical Therapy, University of Pittsburgh, Pennsylvania 15260, USA. jbrach@pitt.edu; AM Kriska; AB Newman; JM VanSwearingen
版本/格式: 文章 文章 : 英语
刊登在:The journals of gerontology. Series A, Biological sciences and medical sciences, 2001 Dec; 56(12): M767-70
数据库:取自MEDLINE®/PubMed®,这是美国医学图书馆的一个数据库。
其它数据库: British Library Serials
提要:
BACKGROUND: Biologic changes are expected to occur prior to disability. Compared with physical disability measures, measures of muscle impairment may be 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  再读一些...
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文件类型: 文章
所有的著者/提供者: JS Brach 附属: Department of Physical Therapy, University of Pittsburgh, Pennsylvania 15260, USA. jbrach@pitt.edu; AM Kriska; AB Newman; JM VanSwearingen
ISSN:1079-5006
语言注释: English
专有的标识符 119287443
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摘要:

BACKGROUND: Biologic changes are expected to occur prior to disability. Compared with physical disability measures, measures of muscle impairment may be 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 68.6% 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 > or = 1 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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