Department of Planning, Policy, and Design, University of California at Irvine, California, USA.
Int J Behav Nutr Phys Act. 2011 Jun 20;8:64. doi: 10.1186/1479-5868-8-64.
A school-based physical activity intervention designed to encourage adolescent girls to be more active was more effective for some participants than for others. We examined whether baseline enjoyment of exercise moderated response to the intervention.
Adolescent girls with a low level of baseline activity who participated in a controlled trial of an intervention to promote increased physical activity participation (n = 122) self-reported their enjoyment of exercise and physical activity participation at baseline, mid-way through the intervention, and at the end of the 9-month intervention period. At all three time points, participants also underwent assessments of cardiovascular fitness (VO2peak) and body composition (percent body fat). Repeated measures analysis of variance examined the relationship of baseline enjoyment to change in physical activity, cardiovascular fitness, body composition and enjoyment of exercise.
A significant three-way interaction between time, baseline enjoyment, and group assignment (p < .01) showed that baseline enjoyment moderated the effect of the intervention on vigorous activity. Within the intervention group, girls with low enjoyment of exercise at baseline increased vigorous activity from pre-to post-intervention, and girls with high baseline enjoyment of exercise showed no pre-post change in vigorous activity. No differences emerged in the comparison group between low-and high-enjoyment girls.
Adolescent girls responded differently to a physical activity promotion intervention depending on their baseline levels of exercise enjoyment. Girls with low enjoyment of exercise may benefit most from a physical-education based intervention to increase physical activity that targets identified barriers to physical activity among low-active adolescent girls.
一项旨在鼓励青少年女孩更加活跃的基于学校的身体活动干预措施对某些参与者比其他参与者更有效。我们研究了基线运动享受程度是否调节了对干预的反应。
参加促进身体活动参与的干预措施的对照试验的低基线活动水平的青少年女孩（n = 122）自我报告了基线、干预中途和 9 个月干预期结束时的运动享受程度和身体活动参与度。在所有三个时间点，参与者还接受了心血管健康（最大摄氧量峰值）和身体成分（体脂肪百分比）的评估。重复测量方差分析检查了基线享受与身体活动、心血管健康、身体成分和运动享受变化之间的关系。
时间、基线享受和组分配之间的显著三向交互作用（p <.01）表明，基线享受调节了干预对剧烈活动的影响。在干预组中，基线运动享受程度低的女孩从干预前到干预后增加了剧烈活动，而基线运动享受程度高的女孩在剧烈活动方面没有出现预-后变化。在比较组中，低和高享受的女孩之间没有出现差异。
青少年女孩对身体活动促进干预的反应不同，具体取决于她们的基线运动享受水平。对运动享受程度低的女孩来说，基于体育教育的干预措施可能会增加身体活动，从而增加针对低活跃青少年女孩的身体活动障碍，这可能会带来最大的益处。
