Brooke Hannah L, Corder Kirsten, Griffin Simon J, van Sluijs Esther M F
UKCRC Centre for Diet and Activity Research (CEDAR), Medical Research Council Epidemiology Unit, University of Cambridge School of Clinical Medicine, Cambridge, United Kingdom.
UKCRC Centre for Diet and Activity Research (CEDAR), Medical Research Council Epidemiology Unit, University of Cambridge School of Clinical Medicine, Cambridge, United Kingdom ; Medical Research Council Epidemiology Unit, University of Cambridge School of Clinical Medicine, Cambridge, United Kingdom.
PLoS One. 2014 Feb 12;9(2):e89028. doi: 10.1371/journal.pone.0089028. eCollection 2014.
Promoting physical activity in youth is important for health, but existing physical activity interventions have had limited success. We aimed to inform intervention design by i) describing drop-out, continuation and uptake of specific activities over the transition to adolescence; and ii) examining Variety (number of different activities/week) and Frequency (number of activity session/week) of activity participation and their associations with changes in objectively measured physical activity from childhood to adolescence.
At age 10.2±0.3 and 14.2±0.3 years, 319 children in the SPEEDY study (46% boys) wore GT1M Actigraph accelerometers for 7 days and provided self-reported participation (never, once, 2 to 3 times or four or more times, over the last 7 days) in 23 leisure-time activities. Associations of change in moderate-to-vigorous intensity PA (MVPA) (≥2000 counts/minute) and change in total physical activity (TPA) (average accelerometer counts/minute) with exposure variables Z-score transformed (change in) Variety and Frequency were examined using multilevel linear regression, clustered by school, in simple and adjusted models.
The number of children ever reporting a specific activity ranged from 30 ('Hockey') to 279 ('Running or jogging'). Some activities were susceptible to drop-out (e.g. 'Skipping') but others were commonly continued or taken up (e.g. 'Household chores'). Overall, Variety and Frequency declined (mean±SD ΔVariety -3.1±4.4 activities/week; ΔFrequency -7.2±12.0 session/week). ΔMVPA and ΔTPA were not associated with Variety or Frequency at baseline, nor with ΔVariety or ΔFrequency (p>0.29 in all models).
Popularity of specific activities as well as drop-out, continuation and uptake should be considered in future intervention development. Activities that are commonly continued or taken up may be more valuable to encourage in interventions than those with low participation or high drop-out. We did not find evidence to support the idea that Variety and Frequency may be key elements to include in future interventions.
促进青少年身体活动对健康很重要，但现有的身体活动干预措施成效有限。我们旨在通过以下方式为干预设计提供信息：i）描述在向青春期过渡期间特定活动的退出、持续参与和参与情况；ii）研究活动参与的多样性（每周不同活动的数量）和频率（每周活动次数）及其与从童年到青春期客观测量的身体活动变化的关联。
在10.2±0.3岁和14.2±0.3岁时，快速研究中的319名儿童（46%为男孩）佩戴GT1M活动监测仪7天，并提供了他们在23项休闲活动中的自我报告参与情况（过去7天内从不参与、参与一次、参与2至3次或参与四次及以上）。使用多水平线性回归，按学校聚类，在简单模型和调整模型中，研究中度至剧烈强度身体活动（MVPA）（≥2000计数/分钟）的变化和总身体活动（TPA）（平均监测仪计数/分钟）的变化与经Z分数转换的暴露变量（多样性和频率的变化）之间的关联。
曾报告参与特定活动的儿童数量从30人（“曲棍球”）到279人（ “跑步或慢跑”）不等。一些活动容易出现退出情况（如“跳绳”），但其他活动通常会持续或开始参与（如“家务”）。总体而言，多样性和频率下降（平均值±标准差：多样性变化 -3.1±4.4项活动/周；频率变化 -7.2±12.0次/周）。基线时，MVPA和TPA的变化与多样性或频率无关，也与多样性变化或频率变化无关（所有模型中p>0.29）。
在未来的干预发展中，应考虑特定活动的受欢迎程度以及退出、持续参与和参与情况。在干预中鼓励通常会持续或开始参与的活动可能比参与度低或退出率高的活动更有价值。我们没有找到证据支持多样性和频率可能是未来干预中应包含的关键要素这一观点。
