Maturity negates the gender-related difference in physical activity among youth. Is this equally justified whatever the accelerometer cut-off point used?

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• 作者：Djamel Zitouni^a ; ^b ; ^c ; Benjamin C. Guinhouya^a ; ^b ; ^{benjamin.guinhouya@univ-lille2.fr}
• 关键词：Activity behavior ; Biological maturity ; Gender ; Prepubescent
• 刊名：Journal of Science and Medicine in Sport
• 出版年：2012
• 出版时间：July, 2012
• 年：2012
• 卷：15
• 期：4
• 页码：327-333
• 全文大小：390 K

文摘

Objectives

To examine the consistency in findings about the influence of maturity on the gender-difference in moderate-to-vigorous physical activity (MVPA) of children using different cut-off points for MVPA.

Design

Cross-sectional observation study.

Methods

The sample involved 253 children (139 boys) of 9.9 ¡À 0.9 years. Their physical activity was evaluated using an Actigraph accelerometer. The biological age of children was determined with their estimated age at the peak height velocity, and maturity categories were gender-specific defined.

Results

Boys spent more time in MVPA than girls (P < 0.0001), and no maturity-related differences were obtained on the whole sample. It was only among boys that differences were found between maturity groups with cut-off points of 3000 cpm (P = 0.034), 3200 cpm (P = 0.024), and 3600 cpm (P = 0.011). At a given maturity level, boys spent significantly more time in MVPA than girls, except with the cut-off point of 1000 cpm (P = 0.07). There were higher proportions of sufficiently active boys, but significances were reached only with cut-off points above 3000 cpm. There were no maturity-related differences in the proportion of sufficiently active children as MVPA was computed using cut-off points of 1000 cpm, 2000 cpm or 3000 cpm.

Conclusions

The role of maturity in the gender-difference in MVPA seems unclear as one another cut-off point is used among children. Even if a relatively greater consistency was found with the three cut-off points above 3000 cpm, data comparison may require a conversion system until a consensus is reached about the exact value to be used among children.