|| Checking for direct PDF access through Ovid
Cross-sectional.Although low back pain (LBP) occurs commonly in adolescence, little is known about the relationship between objectively measured physical activity and chronic LBP.To assess the relationship between an objective physical activity measure (accelerometer) and standard clinical measures (pain intensity, disability, and quality of life) in a sample of adolescents with recurrent or chronic LBP.The study included a subsample of 143 adolescents, 12 to 18 years of age, from a randomized clinical trial. Pearson correlations (r) and bivariate linear regression were used to assess the relationship between baseline measures of sedentary, light, and moderate-to-vigorous physical activity using accelerometers and clinical measures of LBP (pain intensity, disability, and quality of life).Participants spent an average of 610.5 minutes in sedentary activity, 97.6 minutes in light physical activity, and 35.6 minutes in moderate-to-vigorous physical activity per day. Physical activity was very weakly associated with clinical measures of LBP (r<0.13). None of the assessed correlations were statistically significant, and bivariate regression models showed that physical activity measures explained very little of the variability for clinical measures of LBP (R2<0.02).We found no important relationship between objectively measured physical activity and self-reported LBP intensity, disability, or quality of life in adolescents with recurrent or chronic LBP. The parent randomized clinical trial was registered at ClinicalTrials. gov (NCT01096628).