Quantifying habitual levels of physical activity according to impact in older people: Accelerometry protocol for the VIBE study

Kevin C. Deere, Kimberly Hannam, Jessica Coulson, Alex Ireland, Jamie S. McPhee, Charlotte Moss, Mark H. Edwards, Elaine Dennison, Cyrus Cooper, Adrian Sayers, Matthijs Lipperts, Bernd Grimm, Jon H. Tobias*

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

31 Citations (Scopus)

Abstract

Physical activity (PA) may need to produce high impacts to be osteogenic. The aim of this study was to identify threshold(s) for defining high impact PA for future analyses in the VIBE (Vertical Impact and Bone in the Elderly) study, based on home recordings with triaxial accelerometers. Recordings were obtained from 19 Master Athlete Cohort (MAC; mean 67.6 years) and 15 Hertfordshire Cohort Study (HCS; mean 77.7 years) participants. Data cleaning protocols were developed to exclude artifacts. Accelerations expressed in g units were categorized into three bands selected from the distribution of positive Y-axis peak accelerations. Data were available for 6.6 and 4.4 days from MAC and HCS participants respectively, with approximately 14 hr recording daily. Three-fold more 0.5-1.0g impacts were observed in MAC versus HCS, 20-fold more 1.0-1.5g impacts, and 140-fold more impacts ≥ 1.5g. Our analysis protocol successfully distinguishes PA levels in active and sedentary older individuals.

Original languageEnglish
Pages (from-to)290-295
Number of pages6
JournalJournal of Aging and Physical Activity
Volume24
Issue number2
DOIs
Publication statusPublished - Apr 2016
Externally publishedYes

Keywords

  • Accelerometry
  • Peak g
  • VIBE

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