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The purpose of this study was to confirm the causal structure model of muscle, motor and liv ing functions utilizing structural equation modeling (SEM). As subjects, 103 community-dwelling older men and women, aged 65.7•}6.9years of age, participated in the study to measure muscle cross-sectional area, maximum voluntary contractions, muscle power, 4 physical performance tests, and 16 questionnaires regarding ability of activities of daily living. The causal structure model of muscle, motor and living functions was hypothesized to be a hierarchical causal structure. The causal structure model of muscle function was hypothesized to be a hierarchical causal structure consisting of 3 sub-domains of muscle mass, muscle strength, and muscle power. Data analysis procedures were as follows : a) testing of construct validity of muscle function variables using confirmatory factor analysis (CFA) in SEM ; b) testing of causal structure using SEM ; c) testing of factor invariance using multi-group analysis for gender. The highest goodness of fit indices was obtained in the causal structure model of muscle, motor and living functions (NFI= .928, CFI= .978, RMSEA = .061). The causal coefficient of muscle function to motor function was .98 (p<.05), followed by .34 for motor function to living function. From the results of multi-group analysis, the measurement invariance model indicated the highest goodness of fit indices (TLI=.968, CFI .977). It was con cluded that the hierarchical causal relation was among muscle, motor and living functions, and in which muscle function was consisted of 3 sub-domains. (Jpn. J. Phys. Fitness Sports Med. 2003, 52 Suppl : 213-224) key word : functional fitness, physical fitness, activities of daily living (ADL), structural equation modeling, factor invariance 1)筑波大学体 育科学系 , 〒305-8574茨 城県つ くば市天王台1-1-1 2)筑波大学大学院体育科学研 究科 ,同 上

CAUSAL STRUCTURE BETWEEN MUSCLE, MOTOR AND LIVING FUNCTIONS IN COMMUNITY DWELLING ELDERS