青少年客观测量的身体活动与身体成分纵向变化之间的关联：特罗姆瑟研究“健康未来”队列
Association between objectively measured physical activity and longitudinal changes in body composition in adolescents: the Tromsø study fit futures cohort.
作者信息
Aars Nils Abel, Beldo Sigurd, Jacobsen Bjarne Koster, Horsch Alexander, Morseth Bente, Emaus Nina, Furberg Anne-Sofie, Grimsgaard Sameline
机构信息
Department of Community Medicine, UiT The Arctic University of Norway, Tromso, Troms, Norway
Nordlandssykehuset HF, Bodø, Norway.
出版信息
BMJ Open. 2020 Oct 7;10(10):e036991. doi: 10.1136/bmjopen-2020-036991.
OBJECTIVES
Physical activity may be important in deterring the obesity epidemic. This study aimed to determine whether objectively measured physical activity in first year of upper secondary high school predicted changes in body composition over 2 years of follow-up in a cohort of Norwegian adolescents (n=431).
DESIGN
A longitudinal study of adolescents (mean age of 16 (SD 0.4) at baseline, 60.3% girls) participating in the Fit Futures studies 1 (2010-2011) and 2 (2012-2013).
SETTING
All eight upper secondary high schools in two municipalities in Northern Norway.
PARTICIPANTS
Students participating in both studies and under the age of 18 at baseline and with valid measurement of physical activity at baseline and body composition in both surveys.
PRIMARY AND SECONDARY OUTCOMES
Change in objectively measured body mass index and waist circumference and change in dual-energy X-ray absorptiometry measured fat mass index, lean mass index (LMI) and appendicular LMI (aLMI) between baseline and follow-up.
RESULTS
At baseline, boys had significantly higher physical activity volume (p=0.01) and spent on average of 6.4 (95% CI 2.1 to 10.6) more minutes in moderate-to-vigorous physical activity (MVPA) than girls (p<0.01). In girls, multivariate regression analyses showed that more sedentary time was negatively associated with changes in LMI (p<0.01) and aLMI (p<0.05), whereas more light activity had opposite effects on these measures (p<0.01 and p<0.05, respectively). No significant associations between measures of baseline physical activity and changes in body composition parameters were observed in boys.
CONCLUSIONS
In this cohort of Norwegian adolescents, sedentary and light physical activity was associated with changes in LMI and aLMI in girls, but not boys. Minutes spent in MVPA in first year of upper secondary high school was not associated with changes in measures of body composition in neither sex after 2 years.
目的
身体活动对于遏制肥胖流行可能至关重要。本研究旨在确定挪威青少年队列（n = 431）在高中一年级时通过客观测量的身体活动是否能预测两年随访期内身体成分的变化。
设计
对参与“健康未来”研究1（2010 - 2011年）和研究2（2012 - 2013年）的青少年进行纵向研究（基线时平均年龄16岁（标准差0.4），60.3%为女孩）。
地点
挪威北部两个自治市的所有八所高中。
参与者
参加两项研究、基线时年龄在18岁以下且在两次调查中均有有效身体活动测量值和身体成分测量值的学生。
主要和次要结局
基线与随访之间通过客观测量的体重指数和腰围的变化，以及通过双能X线吸收法测量的脂肪量指数、瘦体重指数（LMI）和附属瘦体重指数（aLMI）的变化。
结果
在基线时，男孩的身体活动量显著更高（p = 0.01），且在中度至剧烈身体活动（MVPA）中平均比女孩多花费6.4分钟（95%置信区间2.1至10.6）（p < 0.01）。在女孩中，多变量回归分析表明，久坐时间越长与LMI变化（p < 0.01）和aLMI变化（p < 0.05）呈负相关，而更多的轻度活动对这些指标有相反影响（分别为p < 0.01和p < 0.05）。在男孩中，未观察到基线身体活动指标与身体成分参数变化之间存在显著关联。
结论
在这个挪威青少年队列中，久坐和轻度身体活动与女孩的LMI和aLMI变化有关，但与男孩无关。高中一年级时在MVPA中花费的分钟数与两年后两性的身体成分测量指标变化均无关。
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