The Effects of Physical Activity on Body Composition and Basal Metabolic Rate of Taiwanese Aboriginal Children during Daily School Time

原住民學童在校時身體活動對身體組成與基礎代謝率的影響

Abstract

LANGUAGE NOTE | Document text in English; abstract also in Chinese.

Physical activity is one of the important factors for maintaining weight in adults and children, especially moderate-to- vigorous physical activity (MVPA). However, few studies have discussed about physical activity and body composition of aboriginal children, in spite of the differences existing between aboriginal and non-aboriginal children. As a result, the aim of this study was to investigate the effects of physical activity on the body composition and basal metabolic rate (BMR) of Taiwanese aboriginal children. Methods: Thirty boys (aged 10.7 ± 1.5 yr with a body-mass index (BMI) of 19.0 ± 4.2 kg/m²) and 26 girls (aged 10.0 ± 1.5 yr with a BMI of 18.2 ± 3.7 kg/m²) participated in this study. Bouchard's physical activity questionnaire was used to measure the physical activity level. The body composition and BMR were determined by a bioelectrical impedance analysis. Results: For all subjects, the period of school time, from leaving home to arriving back home, was totally 530 ± 38minutes. Children engaged in 353.8 ± 29.7 (66%), 121.9 ± 9.7 (23%), 37.1 ± 7.5 (7%), and 21.4 ± 7.0 (4%) minutes of sedentary, light, moderate, and vigorous levels of exercise, respectively. The accumulated time of MVPA was significantly higher for boys than for girls. In addition, after the statistical analysis, MVPA was significantly related to the percent body fat and BMR (-0.79 and 0.63; p < 0.05). Conclusions: Sufficient physical activity time, especially MVPA, benefits the maintenance of a normal BMI range for aboriginal children.

身體活動對維持成人與孩童的體重相當重要，特別是中度與激烈程度的身體活動。儘管原住民與非原住民孩童存在著差異，但原住民兒童身體活動與身體組成的關係卻很少被討論。因此，本研究目的探討身體活動對原住民兒童身體組成與基礎代謝率的影響。30位原住民男學童(年齡：10.7 ± 1.5歲，身體質量指數：19.0 ± 4.2 kg/m²)與26位原住民女學童(年齡： 10.0 ± 1.5歲，身體質量指數：18.2 ± 3.7 kg/m²)參與本研究。Bouchard身體活動問卷調查原住民學童不同程度的身體活動，並以生物電阻法原理測量身體組成與基礎代謝率。結果：在校時間，從離家至返家，總計為530 ± 38分鐘。在坐式、輕度、中度、激烈等不同程度的身體活動時間 > 分別為353.8 ± 29.7 (66%)、121.9 ± 9.7 (23%)、37.1 ± 7.5 (7%)、21.4 ± 7.0 (4%)分鐘。男原住民學童在學校累積的中度-激烈的身體活動時間顯著多於女原住民學童。再者，中度-激烈的身體活動時間與原住民學童的體脂肪百分比、基礎代謝率有顯著相關(079、0.63; p < 0.05)。結論：足夠的身體活動時間，特別是中度-激烈程度的身體活動，將有助於原住民學童維持身體質量指數在正常範圍。