Association Between Sedentary Time and Quality of Life From the Osteoarthritis Initiative: Who Might Benefit Most From Treatment?
Daniel Pinto, Jing Song, Jungwha Lee and 5 others
PMID 28645770WHAT IT FOUND
Only the most sedentary adults with knee osteoarthritis lost quality of life as sitting time increased.
For these individuals, replacing one hour of sitting with moderate-to-vigorous activity showed a potential quality-of-life gain, while light activity did not.
Key findings
01An additional hour of sedentary behavior significantly reduced quality-of-life-adjusted years only in the most sedentary quartile, with no significant relationship in other quartiles.
02In the most sedentary group, replacing one hour of sitting with moderate-to-vigorous activity was associated with a median improvement of 0.23 quality-adjusted life years, whereas replacing it with light activity was not significant.
03The association between sedentary time and quality of life was not causal, and the study did not find that reducing sitting in already active individuals improves quality of life.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
The study is observational, so it cannot prove that reducing sedentary time causes improved quality of life. Accelerometers do not capture all activities, such as cycling or upper-body movement, and were not worn during water-based activities. The analysis did not initially adjust for marital status, although a sensitivity analysis showed results remained the same. The benefit of reducing sedentary time was only seen in the most sedentary quartile, limiting generalizability to active individuals. The isotemporal substitution models estimate potential benefits of replacing activities, which may not reflect real-world behavioral changes.
Declared interests
The provided text does not include a conflict of interest or funding declaration section.
The easy way to misread this
Do not assume that reducing sedentary time will improve quality of life for all patients with knee osteoarthritis. The significant association was found only in the most sedentary quartile, and the study is observational, meaning it shows a link rather than proof that changing behavior causes improvement.