The Association of Physical Activity Fragmentation with Physical Function in Older Adults: Analysis from the SITLESS Study

Jason Wilson, Ilona Mc Mullan, Nicole Blackburn, Natalie Klempel, Javier Jerez-Roig, Guillermo Oviedo, Jochen Klenk, Dhayana Dallmeier, Laura Coll-Planas, Emma McIntosh, Mathias Skjødt, Paolo Caserotti, Mark Tully

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Abstract

The distribution of physical activity bouts through the day may provide useful information for assessing the impacts of interventions on aspects such as physical function. This study aimed to investigate the associations between physical activity fragmentation, tested using different minimum physical activity bout lengths, with physical function in older adults. The SITLESS project recruited 1360 community-dwelling participants from four European countries (≥65 years old). Physical activity fragmentation was represented as the active-to-sedentary transition probability (ASTP), the reciprocal of the average physical activity bout duration measured using ActiGraph wGT3X+ accelerometers. Four minimum bout lengths were utilised to calculate the ASTP: ≥10-s, ≥60-s, ≥120-s and ≥300-s. Physical function was assessed using the 2-min walk test (2MWT) and the composite score from the Short Physical Performance Battery (SPPB) test. Linear regression analyses, after adjusting for relevant covariates, were used to assess cross-sectional associations. After adjustment for relevant covariates, lower ASTP using ≥10-s bouts were associated with longer 2MWT distances and higher SPPB scores. Lower ASTP using ≥120-s bouts and ≥300-s bouts were associated with longer 2MWT distances but not the SPPB. Less fragmented physical activity patterns appeared to be associated with better physical function in community-dwelling older adults.
Original languageEnglish
Pages (from-to)63-73
Number of pages11
JournalJournal of Ageing and Longevity
Volume2
Issue number1
Early online date3 Mar 2022
DOIs
Publication statusPublished - 3 Mar 2022

Bibliographical note

Funding: This research was funded by the European Union program Horizon 2020, grant number
H2020-Grant 634270 as part of the SITLESS consortium.

Keywords

  • older adult
  • accelerometry
  • physical activity
  • fragmentation
  • physical function

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