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

Research output: Contribution to journalArticle (Academic Journal)peer-review

21 Citations (Scopus)
293 Downloads (Pure)

Abstract

BACKGROUND: Physical activity (PA) may need to produce high impacts to be osteogenic.

AIMS: 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.

METHODS: 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 artefacts. Accelerations expressed in g units were categorised into three bands selected from the distribution of positive Y-axis peak accelerations.

RESULTS: Data was available for 6.6 and 4.4 days from MAC and HCS participants respectively, with approximately 14 hours 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.

CONCLUSIONS: Our analysis protocol successfully distinguishes PA levels in active and sedentary older individuals.

Original languageEnglish
Article number24
Pages (from-to)290-295
Number of pages6
JournalJournal of Aging and Physical Activity
Volume24
Issue number2
DOIs
Publication statusPublished - Apr 2015

Keywords

  • peak g
  • accelerometry
  • VIBE

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