将久坐时间重新分配为体育活动对儿童身体成分的横断面和前瞻性影响。
Cross-sectional and prospective impact of reallocating sedentary time to physical activity on children's body composition.
作者信息
Sardinha Luís B, Marques Adilson, Minderico Cláudia, Ekelund Ulf
机构信息
Interdisciplinary Center for the Study of Human Performance (CIPER), Exercise and Health Laboratory, Faculty of Human Kinetics, Universide de Lisboa, Cruz Quebrada, Portugal.
Interdisciplinary Center for the Study of Human Performance (CIPER), Faculty of Human Kinetics, Universidade de Lisboa, Cruz Quebrada, Portugal.
出版信息
Pediatr Obes. 2017 Oct;12(5):373-379. doi: 10.1111/ijpo.12153. Epub 2016 Jun 2.
BACKGROUND
The amount of time children spend in sedentary behaviours may have adverse health effects.
OBJECTIVE
To examine the substitution effects of displacing a fixed duration of sedentary time with physical activity (PA) on children's body composition.
METHODS
We included 386 children (197 boys). Outcomes were body mass index, waist circumference, total body fat mass and trunk fat mass assessed by dual-energy X-ray absorptiometry. Sedentary time and PA were measured with accelerometers. Data were analysed by isotemporal analyses estimating the effect of reallocating 15 and 30 min d of sedentary time into light (light physical activity), and moderate-to-vigorous (MVPA) PA on body composition.
RESULTS
Reallocating 15 and 30 min d of sedentary time into MVPA was negatively associated with body fatness in cross-sectional analyses. Prospectively, reallocating 30 min of sedentary time into 30 min of MVPA was negatively associated with waist circumference (β = -1.11, p < 0.05), trunk fat mass (β = -0.21, p < 0.05), and total body fat mass (β = -0.48, p < 0.05) at follow-up (20 months). The magnitude of associations was half in magnitude and remained significant (p < 0.05) when reallocating 15 min of sedentary time into MVPA. Reallocating sedentary time into light physical activity was not related (p > 0.05) with body fatness outcomes.
CONCLUSIONS
Substituting sedentary time with MVPA using isotemporal analysis is associated with positive effects on body composition.
背景
儿童久坐行为的时长可能对健康产生不利影响。
目的
研究用体力活动（PA）替代固定时长的久坐时间对儿童身体成分的替代效应。
方法
我们纳入了386名儿童（197名男孩）。通过双能X线吸收法评估的结果指标包括体重指数、腰围、全身脂肪量和躯干脂肪量。使用加速度计测量久坐时间和PA。通过等时分析对数据进行分析，估计将每天15分钟和30分钟的久坐时间重新分配为轻度（轻度体力活动）和中度至剧烈（MVPA）PA对身体成分的影响。
结果
在横断面分析中，将每天15分钟和30分钟的久坐时间重新分配为MVPA与肥胖呈负相关。前瞻性地，在随访（20个月）时，将30分钟的久坐时间重新分配为30分钟的MVPA与腰围（β = -1.11，p < 0.05）、躯干脂肪量（β = -0.21，p < 0.05）和全身脂肪量（β = -0.48，p < 0.05）呈负相关。当将15分钟的久坐时间重新分配为MVPA时，关联强度减半且仍具有显著性（p < 0.05）。将久坐时间重新分配为轻度体力活动与肥胖结局无关（p > 0.05）。
结论
使用等时分析用MVPA替代久坐时间对身体成分有积极影响。
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