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Potential Functional Benefit From Light Intensity Physical Activity in Knee Osteoarthritis
Daniel K White1, Jungwha Lee2, Jing Song3
1Department of Physical Therapy, University of Delaware, Newark, Delaware.
American Journal of Preventive Medicine
|September 5, 2017
Summary
Replacing sedentary time with light activity can reduce the risk of functional limitation in knee osteoarthritis patients. Light activity is a beneficial alternative when moderate to vigorous activity is not feasible.
Area of Science:
- Gerontology
- Rheumatology
- Physical Therapy
Background:
- Knee osteoarthritis (KOA) can limit participation in high-intensity physical activities.
- The benefits of light-intensity physical activity for individuals with KOA are not well-established.
- Understanding the impact of replacing sedentary time with light activity is crucial for managing KOA progression.
Purpose of the Study:
- To investigate the effect of substituting sedentary time with light-intensity physical activity on the incidence of functional limitation in individuals with or at high risk of KOA.
- To quantify the association between light activity and functional decline over a 2-year period.
Main Methods:
- Utilized data from the Osteoarthritis Initiative, including 1,873 participants with or at high risk of KOA without baseline functional limitation.
- Accelerometer data were analyzed to measure time spent in sedentary, light, and moderate to vigorous physical activity.
- Incident functional limitation was defined by slow gait speed, high Western Ontario and McMasters University Osteoarthritis Index scores, or low Short Form 12 Physical Component scores.
Main Results:
- Replacing 60 minutes of daily sedentary time with 60 minutes of light activity was associated with a 17% reduced risk of developing slow gait speed after 2 years (HR=0.83, 95% CI=0.70-0.99).
- Approximately 5 minutes of daily moderate to vigorous physical activity yielded equivalent risk reduction benefits compared to 60 minutes of light activity.
- Secondary outcomes related to patient-reported function did not achieve statistical significance.
Conclusions:
- Substituting sedentary behavior with light-intensity physical activity may lower the risk of performance-based functional limitations in individuals with KOA.
- Moderate to vigorous physical activity demonstrates a stronger risk reduction effect than light activity.
- Light activity serves as a valuable alternative to sedentary behavior for individuals unable to engage in higher-intensity exercise.
