Abdominal obesity mediates the association between a low physical activity and a decline in gait speed in community-dwelling elderly people: A cross-sectional study

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  • Sugimoto Taiki
    Department of Community Health Sciences, Kobe University, Graduate School of Health Sciences
  • Tsutsumimoto Kota
    Department of Preventive Gerontology, Center for Gerontology and Social Science, National Center for Geriatrics and Gerontology
  • Nakakubo Sho
    Department of Community Health Sciences, Kobe University, Graduate School of Health Sciences Department of Preventive Gerontology, Center for Gerontology and Social Science, National Center for Geriatrics and Gerontology
  • Murata Shunsuke
    Department of Community Health Sciences, Kobe University, Graduate School of Health Sciences
  • Doi Takehiko
    Department of Preventive Gerontology, Center for Gerontology and Social Science, National Center for Geriatrics and Gerontology Japan Society for the Promotion of Science Research Institute, National Center for Geriatrics and Gerontology
  • Ono Rei
    Department of Community Health Sciences, Kobe University, Graduate School of Health Sciences

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Other Title
  • 地域在住高齢者において腹部肥満は身体活動量減少と歩行能力低下の媒介因子である　―媒介分析を用いた横断的検討―
  • チイキ ザイジュウ コウレイシャ ニ オイテ フクブ ヒマン ワ シンタイ カツドウリョウ ゲンショウ ト ホコウ ノウリョク テイカ ノ バイカイ インシ デ アル : バイカイ ブンセキ オ モチイタ オウダンテキ ケントウ

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Aim: A low physical activity leads to obesity and a decline in the physical function. The aim of this cross-sectional study was to examine whether the association between a low physical activity and low physical function was mediated by obesity. Methods: A total of 73 community-dwelling elderly people participated in this study. The analysis included 56 participants without knee and hip osteoarthritis, low cognitive function (the Mini Mental State Examination score <24) and rheumatoid arthritis (mean age±SD: 73.3±4.1, female: 50%). The daily step count was collected as a measure of physical activity by a single axial accelerometer. The physical function was measured by the gait speed. Obesity was measured by the body mass index and waist circumference. To assess whether the association between the physical activity and physical function was mediated by obesity, linear regression models were fitted according to Baron and Kenny procedures for a mediation analysis. A p value <0.05 was considered to be statistically significant. Results: The body mass index did not act as a mediator in the association between the physical activity and gait speed, whereas the waist circumference acted as a full mediator in the association between the physical activity and gait speed. Conclusion: An increased waist circumference mediates the association between a low physical activity and a low physical function in community-dwelling elderly people.

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