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Accelerometer-monitored sedentary behavior and observed physical function loss.

Pamela A Semanik1, Jungwha Lee, Jing Song

  • 1Pamela A. Semanik is with the College of Nursing, Rush University, Chicago, IL. Barbara E. Ainsworth is with the School of Nutrition and Health Promotion, College of Health Solutions, Phoenix, Arizona. Jungwha Lee, Jing Song, Rowland W. Chang, and Dorothy D. Dunlop are with the Feinberg School of Medicine, Northwestern University, Chicago. Min-Woong Sohn is with the School of Medicine, University of Virginia, Charlottesville. Linda S. Ehrlich-Jones is with the Center for Rehabilitation Outcome Research, Rehabilitation Institute of Chicago. Michael M. Nevitt is with the Coordinating Center, University of California, San Francisco. C. Kent Kwoh is with University of Arizona Medical Center, Tucson.

American Journal of Public Health
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Summary
This summary is machine-generated.

Reducing sedentary time is linked to better physical function in adults with knee osteoarthritis. Less sitting means less future decline in gait speed and chair stand ability, independent of exercise.

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Area of Science:

  • Gerontology
  • Rheumatology
  • Physical Therapy

Background:

  • Knee osteoarthritis (OA) is a leading cause of disability.
  • Sedentary behavior is prevalent in older adults and may impact OA progression.
  • Objective measurement of sedentary time is crucial for understanding its effects.

Purpose of the Study:

  • To investigate the association between objectively measured sedentary behavior and subsequent functional loss in adults with knee OA.
  • To determine if sedentary time predicts decline in gait speed and chair stand performance.

Main Methods:

  • Longitudinal analysis of 1659 participants from the Osteoarthritis Initiative (2008-2012).
  • Baseline sedentary time measured using accelerometers.
  • Functional loss assessed via gait speed and chair stand tests, regressed against sedentary time and covariates.

Main Results:

  • Participants spent nearly two-thirds of waking hours sedentary (average 9.8 hours).
  • Increased sedentary time was significantly associated with decreased gait speed and chair stand rate.
  • These associations remained significant after controlling for numerous covariates.

Conclusions:

  • Lower sedentary behavior is associated with preserved physical function in knee OA patients.
  • Limiting sedentary time is important for maintaining function, alongside moderate-to-vigorous physical activity.
  • Interventions should address both sedentary behavior reduction and physical activity promotion in knee OA management.