Association of Bio-impedance Phase Angle and Physical Activity Level in Older Adults

DOI Open Access
  • UEMURA Kazuki
    Center for Liberal Arts and Sciences, Toyama Prefectural University
  • YAMADA Minoru
    Graduate School of Comprehensive Human Sciences, University of Tsukuba
  • SAHO Kenshi
    Department of Intelligent Robotics, Toyama Prefectural University
  • OKAMOTO Hiroshi
    Center for Liberal Arts and Sciences, Toyama Prefectural University

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Other Title
  • 生体電気インピーダンス法によるPhase angle と高齢者の身体活動レベルの関連

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Abstract

<p>Purpose: To investigate the association between bioelectrical impedance analysis (BIA) derived-phase angle and physical activity level in community-dwelling older adults.</p><p>Methods: A total of 295 older adults (mean age, 72.5 years, men, n=98) participated in this study. Phase angle and muscle mass were examined using a multi-frequency BIA. A tri-axial accelerometer was used to obtain daily physical activity data for 2 weeks. The average number of steps and physical activity level (PAL) were measured. Grip strength and gait speed were also assessed as potential confounding factors. A linear regression model was used to determine whether physical activity was independently associated with phase angle after adjusting for confounding factors.</p><p>Results: In the multivariate linear regression model, PAL was significantly positively correlated with phase angle after adjusting for age, muscle mass, grip strength, and gait speed in both male (β = 0.21) and female subjects (β = 0.21), whereas the average number of steps was significantly positively correlated with phase angle only in female subjects (β = 0.15).</p><p>Conclusions: Older adults with higher PAL are more likely to have higher phase angle, indicating greater cellularity, cell membrane integrity, and function.</p>

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