The association of muscle mass and muscle strength with mobility limitation and history of falls in older adults -focusing on sarcopenia and dynapenia-

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  • Kim Mijin
    Health and Sport Sciences, Graduate School of Comprehensive Human Sciences, University of Tsukuba
  • Soma Yuki
    Graduate School of Medicine, Hirosaki University
  • Tsuji Taishi
    Center for Preventive Medical Sciences, Chiba University
  • Abe Takumi
    Health and Sport Sciences, Graduate School of Comprehensive Human Sciences, University of Tsukuba Japan Society for Promotion of Science
  • Sato Ayane
    Health and Sport Sciences, Graduate School of Comprehensive Human Sciences, University of Tsukuba
  • Fujii Keisuke
    Health and Sport Sciences, Graduate School of Comprehensive Human Sciences, University of Tsukuba
  • Kunika Shoko
    Health and Sport Sciences, Graduate School of Comprehensive Human Sciences, University of Tsukuba
  • Okura Tomohiro
    Faculty of Health and Sport Science, University of Tsukuba

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Other Title
  • 高齢者における筋量･筋力と起居移動動作能力および転倒との関連性 −SarcopeniaとDynapeniaに着目した検討−
  • 高齢者における筋量・筋力と起居移動動作能力および転倒との関連性 : SarcopeniaとDynapeniaに着目した検討
  • コウレイシャ ニ オケル キンリョウ ・ キンリョク ト タチイ イドウ ドウサ ノウリョク オヨビ テントウ ト ノ カンレンセイ : Sarcopenia ト Dynapenia ニ チャクモク シタ ケントウ

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<p>The purpose of this study was to examine the association of muscle mass and muscle strength with mobility limitation and history of falls in community-dwelling older adults. This cross-sectional study included 420 older adults (207 men, 213 women, 73.7 ± 5.2 years). The participants were classified to following four groups according to their appendicular skeletal muscle mass index (AMI) which was evaluated by bioelectric impedance analysis for skeletal muscle mass in the arms and legs and appendicular skeletal muscle strength Z-score (ASZ) which was calculated from hand-grip strength for upper extremity and peak reaction force during sit-to-stand movement for lower extremity: 1) Low AMI and Low ASZ, 2) Low AMI alone, 3) Low ASZ alone, and 4) Normal. Mobility limitation and history of falls were assessed as a self-reported questionnaire. We used a poisson regression analysis with an adjustment for age, body mass index, knee pain, and back pain. The prevalence of mobility limitation was significantly higher at Low AMI and Low ASZ (relative risk, RR = 5.09, 95% confidence interval, CI 2.08–12.46) and Low ASZ alone (RR = 4.79, 95% CI 2.01–11.39) in men and Low AMI and Low ASZ (RR = 1.70, 95% CI 1.01–2.88) in women than Normal. History of falls was significantly associated with Low ASZ alone (RR = 2.00, 95% CI 1.02–3.91) just in men. These results suggest that low muscle strength per weight rather than low muscle mass per height is an important risk factor to increase mobility limitation in both genders and falls in men.</p>

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