O037 Improved sleep is associated with improved hip osteoarthritis symptoms

Aim Sleep problems often co-exist with hip osteoarthritis (OA) can be improved with exercise. Our aim was to investigate whether improvements in sleep quality and duration were associated with improvements in pain and function in people with hip OA following exercise. Methods Data from 185 participants with hip OA, randomized to an exercise intervention were pooled and analyzed. The dependent variable was 3-month change in sleep quality and duration using the Pittsburgh Sleep Quality Index (PSQI; range 0–21, higher scores = poorer sleep). The independent variables were 3-month change in hip pain severity (11-point scale; range 0-10, with higher scores indicating worse pain; minimum clinical important difference 1.8) and function (Western Ontario and McMaster Universities Osteoarthritis Index; range 0-68, with higher scores indicating more dysfunction; minimum clinical important difference 6). Associations between change in PSQI scores and change in pain and function were examined using linear regression models, adjusted for baseline values and covariates. Results Each one-point improvement in the PSQI was associated with a 0.2-point reduction in pain (95% CI: 0.1 to 0.3; adjusted R2 = 0.14) and a 1.1-point improvement in function (95% CI: 0.6 to 1.6; R2 = 0.28). Each one hour increase in sleep duration was associated with a 0.33-point reduction in pain (95% 0.02 to 0.63; R2 = 0.09) and a 2.6-unit improvement in function (95% 1.1 to 4.1; R2 = 0.24). Conclusion Improvements in sleep quality and duration are associated with small improvements in pain and function post-exercise.