• Lars Bo Andersen, Niels Wedderkopp, and Charlotte Leboeuf-Yde.
• Norwegian School of Sport Sciences, Oslo, Norway. lars.bo.andersen@nih.no
• Spine. 2006 Jul 1; 31 (15): 1740-4.

Study DesignA cross-sectional study of 9413 adolescents.ObjectivesTo study the associations between back pain, physical activity, and physical fitness.Summary Of Background DataA high physical fitness level, and especially muscle endurance in the back muscles, is associated with lower risk of back pain, but little is known about other types of physical fitness and back pain in adolescents.MethodsA cross-sectional study of 3956 boys and 5457 girls 17 years of age. The associations between self-reported back pain and different types of physical fitness and self-reported physical activity were analyzed in high schoolchildren in Denmark.ResultsBack pain was reported by 43% of the girls and 37% of the boys. Back pain was associated with low isometric muscle endurance in the back extensors, and the highest quartile had a lower risk of back pain (odds ratio = 0.71; 95% confidence interval, 0.62-0.82) within the last month. No associations were found to aerobic fitness, functional strength, flexibility, or physical activity level after adjustment for muscle endurance. More girls than boys experienced back pain, and it was more common in taller adolescents.ConclusionChildren with high isometric muscle endurance were less likely to report back pain. No other measures of physical fitness or level of self-reported physical activity were linked to back pain reporting.

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