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. 2018 Oct;30(9):1462-1481.
doi: 10.1177/0898264317721554. Epub 2017 Jul 24.

Instrumented Assessment of Physical Activity Is Associated With Muscle Function but Not With Muscle Mass in a General Population

Anna G M Rojer  1 , Esmee M Reijnierse  2 , Marijke C Trappenburg  1   3 , Rob C van Lummel  4   5 , Martijn Niessen  4 , Kim S van Schooten  6 , Mirjam Pijnappels  5 , Carel G M Meskers  1 , Andrea B Maier  2   4
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Instrumented Assessment of Physical Activity Is Associated With Muscle Function but Not With Muscle Mass in a General Population

Anna G M Rojer et al. J Aging Health. 2018 Oct.

Abstract

Objectives: Self-reported physical activity has shown to affect muscle-related parameters. As self-report is likely biased, this study aimed to assess the association between instrumented assessment of physical activity (I-PA) and muscle-related parameters in a general population.

Method: Included were 156 young-to-middle-aged and 80 older community-dwelling adults. Seven days of trunk accelerometry (DynaPort MoveMonitor, McRoberts B.V.) quantified daily physical activity (i.e., active/inactive duration, number and mean duration of active/inactive periods, and number of steps per day). Muscle-related parameters included muscle mass, handgrip strength, and gait speed.

Results: I-PA was associated with handgrip strength in young-to-middle-aged adults and with gait speed in older adults. I-PA was not associated with muscle mass in either age group.

Discussion: The association between I-PA and muscle-related parameters was age dependent. The lack of an association between I-PA and muscle mass indicates the relevance of muscle function rather than muscle mass.

Keywords: activity monitoring; aged; motor activity; muscle strength; physical performance; sarcopenia.

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