Longitudinal changes in sedentary time and physical activity during adolescence
Longitudinal changes in sedentary time and physical activity during adolescence
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DOI：
10.1186/s12966-015-0204-6
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发表时间：
2015-04-01
影响因子：
8.7
通讯作者：
Cooper, Ashley R.
中科院分区：
文献类型：
--
作者：
Harding, Sarah K.;Page, Angie S.;Cooper, Ashley R.
背景资料：体力活动水平低和久坐不动的时间长与青少年的不利健康结果有关。在青春期，体力活动下降，久坐不动的时间增加，但很少有人知道这些变化的幅度是否不同内或之间的学校时间，放学后的时间，或在weekends.Methods：青少年（n = 363）参加的PEACH（个人和环境协会与儿童健康）项目提供加速度计数据在12和15岁。数据收集于2008/2009年和2012/2013年。久坐不动的时间（= 2296 cpm），产生了上学时间，放学后的时间和周末使用学校特定的开始和结束时间。结果：在校期间（+8.23%，95%CI = 7.35 ~ 9.13）、放学后（+6.99%，95%CI = 5.91 ~ 8.07）和周末（+6.86%，95%CI = 5.10 ~ 8.62）久坐时间比例显著增加。在学校（-7.62%，95%CI = -8.26 ~-6.98）、放学后（-7.01%，95%CI = -7.74 ~-6.28）和周末（-6.72%，95%CI = -7.80 ~-5.65）的LPA时间比例也相应减少。在校期间，MVPA所占时间比例保持相对稳定（-0.64，95%CI = -1.11至-0.18），放学后（0.04%，95% CI = -0.58至0.67）和周末（-0.14%，95%CI = -1.18至0.90）。客观测量的久坐时间在12至15岁之间增加，在校期间，放学后，周末，这表明，在所有三种时间背景下，都需要采取干预措施，以减少与年龄相关的久坐时间变化。未来的工作应该确定哪些久坐活动比其他活动变化更大，以告知旨在最大限度地减少青春期久坐时间增加的干预措施。
Background: Low levels of physical activity and high time spent in sedentary activities have been associated with unfavourable health outcomes in adolescents. During adolescence, physical activity declines and sedentary time increases, however little is known about whether the magnitude of these changes differs within or between school-time, after-school time, or at weekends.Methods: Adolescents (n = 363) participating in the PEACH (Personal and Environmental Associations with Children's Health) project provided accelerometer data at 12 and 15 years of age. Data were collected in 2008/2009 and 2012/2013. Time spent sedentary (= 2296 cpm) were generated for school-time, after-school time and for weekends using school-specific start and finish times. All data were analysed in 2014.Results: The proportion of time spent sedentary significantly increased during school (+8.23%, 95% CI = 7.35 to 9.13), after-school (+6.99%, 95% CI = 5.91 to 8.07) and at weekends (+6.86%, 95% CI = 5.10 to 8.62). A parallel decrease was found in the proportion of time spent in LPA during school (-7.62%, 95% CI = -8.26 to -6.98), after-school (-7.01%, 95% CI = -7.74 to -6.28) and at weekends (-6.72%, 95% CI = -7.80 to -5.65). The proportion of time spent in MVPA remained relatively stable during school (-0.64, 95% CI = -1.11 to -0.18), after-school (0.04%, 95% CI = -0.58 to 0.67) and at weekends (-0.14%, 95% CI = -1.18 to 0.90).Conclusions: Objectively measured sedentary time increased between 12 and 15 years of age during-school, after-school, and at weekends, suggesting that interventions aiming to reduce the age-associated changes in sedentary time are needed in all three time contexts. Future work should identify which sedentary activities change more than others to inform interventions which aim to minimise the increase in time spent sedentary during adolescence.