PURPOSE: To investigate whether observed differences in physical activity levels in boys and girls are confounded by biological age differences particularly during the circumpubertal years. METHODS: The physical activity questionnaire for children (PAQ-C) was administered biannually or triannually to 138 (70 boys; 68 girls) Canadian children for seven consecutive years from 1991 to 1997. Participants were 9-18 yr of age. Anthropometric measurements were taken biannually and age at peak height velocity (PHV) determined. Biological age was defined as years from PHV. The data were analyzed using t-tests and random effects models. RESULTS: Level of physical activity decreased with increasing chronological age in both sexes. When aligned on chronological age bands, boys had statistically significantly higher PAQ-C summary scores than girls from 10 through 16 yr of age (P < 0.05). However, when aligned on biological age, sex differences were not apparent, except at 3 yr before PHV. Random effects models of individual growth patterns confirmed these findings. CONCLUSION: Physical activity decreased with increasing chronological age in boys and girls. There were no sex differences in the longitudinal pattern of physical activity when the confounding effects of biological age were controlled except at 3 yr before PHV.
PURPOSE: To investigate whether observed differences in physical activity levels in boys and girls are confounded by biological age differences particularly during the circumpubertal years. METHODS: The physical activity questionnaire for children (PAQ-C) was administered biannually or triannually to 138 (70 boys; 68 girls) Canadian children for seven consecutive years from 1991 to 1997. Participants were 9-18 yr of age. Anthropometric measurements were taken biannually and age at peak height velocity (PHV) determined. Biological age was defined as years from PHV. The data were analyzed using t-tests and random effects models. RESULTS: Level of physical activity decreased with increasing chronological age in both sexes. When aligned on chronological age bands, boys had statistically significantly higher PAQ-C summary scores than girls from 10 through 16 yr of age (P < 0.05). However, when aligned on biological age, sex differences were not apparent, except at 3 yr before PHV. Random effects models of individual growth patterns confirmed these findings. CONCLUSION: Physical activity decreased with increasing chronological age in boys and girls. There were no sex differences in the longitudinal pattern of physical activity when the confounding effects of biological age were controlled except at 3 yr before PHV.
Authors: Christiane Diefenbach; Martina F Schmidt; Jochem König; Michael S Urschitz; Michael Huss Journal: Eur Child Adolesc Psychiatry Date: 2021-06-05 Impact factor: 4.785
Authors: Shelby Lane Francis; Joanna L Morrissey; Elena M Letuchy; Steven M Levy; Kathleen F Janz Journal: Med Sci Sports Exerc Date: 2013-08 Impact factor: 5.411
Authors: Daniel P Bailey; Stuart J Fairclough; Louise A Savory; Sarah J Denton; Dong Pang; Colleen S Deane; Catherine J Kerr Journal: Eur J Pediatr Date: 2012-09-15 Impact factor: 3.183
Authors: Cheryl L Cox; Michele Montgomery; Kevin C Oeffinger; Wendy Leisenring; Lonnie Zeltzer; John A Whitton; Ann C Mertens; Melissa M Hudson; Leslie L Robison Journal: Cancer Date: 2009-02-01 Impact factor: 6.860
Authors: Liane D Heale; Kristin M Houghton; Elham Rezaei; Adam D G Baxter-Jones; Susan M Tupper; Nazeem Muhajarine; Susanne M Benseler; Gilles Boire; David A Cabral; Sarah Campillo; Gaëlle Chédeville; Anne-Laure Chetaille; Paul Dancey; Ciaran Duffy; Karen Watanabe Duffy; Janet Ellsworth; Jaime Guzman; Adam M Huber; Roman Jurencak; Bianca Lang; Ronald M Laxer; Kimberly Morishita; Kiem G Oen; Ross E Petty; Suzanne E Ramsey; Johannes Roth; Rayfel Schneider; Rosie Scuccimarri; Lynn Spiegel; Elizabeth Stringer; Shirley M L Tse; Lori B Tucker; Stuart E Turvey; Rae S M Yeung; Alan M Rosenberg Journal: Pediatr Rheumatol Online J Date: 2021-06-29 Impact factor: 3.054