Sports Center, Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil.
Transl Behav Med. 2021 Oct 23;11(10):1849-1856. doi: 10.1093/tbm/ibab044.
Physical activity is influenced by an interplay of time and setting, thus, the role of psychosocial factors on behavior is expected to vary across the day. This cross-sectional study identified the psychosocial correlates of time spent in physical activity during in-school (i.e., 08:00-11:59) and out-of-school (i.e., 12:00-22:00) time segments. The sample consisted of adolescents (7th to 9th grade) of two public schools in Florianópolis, Brazil. Accelerometer measured light-intensity (LPA) and moderate-to-vigorous-intensity physical activity (MVPA) were estimated. Psychosocial correlates of physical activity (i.e., outcome expectations, attitude, self-efficacy, support from parents, and support from peers) were self-reported. Linear mixed models were applied and interaction effects of gender and age were also analyzed. From a total of 194 participants, 138 and 112 provided in-school and out-of-school valid data, respectively. Outcome expectations were associated with out-of-school MVPA (β = 0.18; p = .006). Age interaction effects were observed for the associations between outcome expectations and out-of-school LPA (β = 0.21; p = .009) and between self-efficacy and out-of-school MVPA (β = 0.19; p = .009). In conclusion, psychosocial correlates were positively associated with out-of-school physical activity and the effects varied according to age. No psychosocial correlates were identified for LPA and MVPA performed during schooltime.
体力活动受到时间和环境的相互影响，因此，心理社会因素对行为的影响预计会因一天中的不同时段而有所变化。本横断面研究确定了在上学时间（即 08:00-11:59）和放学时间（即 12:00-22:00）内，体力活动时间与心理社会因素之间的相关性。该样本由巴西弗洛里亚诺波利斯的两所公立学校的青少年（7 至 9 年级）组成。加速度计测量了低强度活动（LPA）和中等到剧烈强度活动（MVPA）。体力活动的心理社会相关性（即结果预期、态度、自我效能、来自父母的支持和来自同伴的支持）是自我报告的。应用线性混合模型，并分析了性别和年龄的交互作用。在总共 194 名参与者中，有 138 名和 112 名分别提供了上学时间和放学时间的有效数据。结果预期与校外 MVPA 呈正相关（β=0.18；p=0.006）。观察到年龄交互效应，表现在结果预期与校外 LPA（β=0.21；p=0.009）和自我效能与校外 MVPA（β=0.19；p=0.009）之间的关联。总之，心理社会相关性与校外体力活动呈正相关，且这些相关性的影响因年龄而异。在上学时间内，未发现 LPA 和 MVPA 与任何心理社会因素相关。
