Measuring Physical Activity in Children: A Comparison of Four Different Methods - O'Connor, J.; Ball, J.; Steinbeck, K. S.; Davies, P. S. W.; Wishart, C.; Gaskin, K. J.; Baur, L. A. (Pediatric Exercise Science, 2003)
Keywords: sports for children and youths; physical development; activity; spare time activities; sparetime sports; school; sport in schools; education; state of development; development; USA; social sciences; biological and medical sciences; junior sports