1.CAUSAL STRUCTURE BETWEEN MUSCLE, MOTOR AND LIVING FUNCTIONS IN COMMUNITY DWELLING ELDERS
TAKAHIKO NISHIJIMA ; KOYA SUZUKI ; KEISUKE OHTSUKA ; HIDENORI TANAKA ; TAKAHIRO NAKANO ; SHINJI TAKAHASHI ; HIROTAKA TABUCHI ; HIROSHI YAMADA ; ATSUKO KAGAYA ; TETSUO FUKUNAGA ; SHIN-YA KUNO ; MITSUO MATSUDA
Japanese Journal of Physical Fitness and Sports Medicine 2003;52(Supplement):213-224
The purpose of this study was to confirm the causal structure model of muscle, motor and living 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 concluded that the hierarchical causal relation was among muscle, motor and living functions, and in which muscle function was consisted of 3 sub-domains.
2.Associations between serum 25-hydroxyvitamin D3 level and skeletal muscle mass and lower limb muscle strength in Japanese middle-aged subjects.
Akiko KUWABARA ; Naoko TSUGAWA ; Hiroshi KONDO ; Misora AO ; Hitomi FUJIWARA ; Natsuki HOSOKAWA ; Shiho MATSUMOTO ; Kiyoshi TANAKA ; Tetsuo NAKANO
Osteoporosis and Sarcopenia 2017;3(1):53-58
OBJECTIVES: One of the important risk factors of falling is decreased muscle mass and muscle strength. Recently, there has been an increasing concern on the role of vitamin D in muscle strength and physical activity. Aim of our study is to examine the relationships between vitamin D status and muscle mass and muscle strength in middle-aged healthy adults. METHODS: Subjects were 40 healthy volunteers aged 42.0 ± 10.6 years old. Evaluation was made for serum vitamin D₃ metabolites including 25-hydroxyvitamin D₃ [25(OH)D₃] and 24,25-dihydroxyvitamin D₃ [24,25(OH)₂D₃] concentrations, lower limb muscle strength, and dietary intake by food frequency questionnaire. Body composition was measured by dual-energy X-ray absorptiometry (DXA), and appendicular skeletal mass index (ASMI) was calculated as skeletal muscle mass/squared height. RESULTS: 70% of the subjects had vitamin D insufficiency/deficiency (serum total 25(OH)D < 20 ng/mL), and female subjects had significantly lower serum total 25(OH)D level compared with males. Vitamin D insufficiency/deficiency group had significantly higher body fat, lower SMI and muscle strength, probably reflecting higher percentage of female subjects. Serum vitamin D₃ metabolites levels were significantly correlated with whole and site-specific ASMI, and lower limb muscle strength, except for the correlation between serum 24,25(OH)₂D₃ concentration and lower limb muscle strength. In addition, serum 25(OH)D₃ level was a positive significant predictor for both ASMI and lower limb muscle strength, while serum 24,25(OH)₂D₃ level was not their significant predictor. CONCLUSIONS: Serum 25(OH)D₃ level was significantly correlated with both skeletal muscle mass and lower limb muscle strength.
Absorptiometry, Photon
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Accidental Falls
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Adipose Tissue
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Adult
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Asian Continental Ancestry Group*
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Body Composition
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Calcifediol*
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Female
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Healthy Volunteers
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Humans
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Lower Extremity*
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Male
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Motor Activity
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Muscle Strength*
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Muscle, Skeletal*
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Risk Factors
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Vitamin D
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Vitamins