Abstract

 

Pediatric obesity confers increased risk for a host of negative psychological and physical health consequences and is reliably linked to low levels of physical activity. Affective antecedents and consequences of physical activity are thought to be important for the development and maintenance of such behavior, though research examining these associations in youth across the weight spectrum remains limited.

Objective 

This study examined bi-directional associations between affect and physical activity (i.e., moderate-to-vigorous physical activity [MVPA] and total activity counts), and the extent to which weight (body mass index z-score [z-BMI]) moderated these associations.

Methods 

Participants were drawn from a prior study of siblings (N = 77; mean age = 15.4 ± 1.4 years) discordant for weight status (39 nonoverweight siblings, 38 siblings with overweight/obesity) who completed ecological momentary assessment (EMA) with accelerometer-assessed physical activity.

Results 

Generalized linear mixed models indicated z-BMI moderated trait-level and momentary associations. When adolescents with higher z-BMI reported momentary negative affect, they evidenced less MVPA within the next hour. Across the sample, greater overall activity was associated with lower negative affect. However, at the momentary level, when adolescents with higher (but not lower) z-BMI evidenced greater activity, they reported decreases in negative affect.

Conclusions 

Findings indicate affective experiences surrounding physical activity differ according to z-BMI. Specifically, momentary negative affect may impede momentary MVPA among youth with higher z-BMI. Further research is warranted to elucidate factors influencing these momentary associations and the extent to which these momentary associations prospectively predict weight change.

中文翻译：

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体重不一致的兄弟姐妹中实时影响与身体活动之间的双向关联

摘要

 

小儿肥胖会增加产生一系列负面心理和身体健康后果的风险，并且与低水平的身体活动有关。身体活动的情感前因和后果被认为对这种行为的发展和维持很重要，尽管在青年体重范围内检查这些关联的研究仍然有限。

客观的 

这项研究检查了情感和身体活动（即中度到剧烈的身体活动 [MVPA] 和总活动计数）之间的双向关联，以及体重的程度（体重指数 z 得分 [z-BMI]）主持这些协会。

方法 

参与者来自先前对体重状态不一致的兄弟姐妹（N  =  77；平均年龄 = 15.4 ± 1.4 岁）（39 名非超重兄弟姐妹，38 名超重/肥胖兄弟姐妹）的先前研究，他们完成了加速度计评估的生态瞬时评估（EMA）体力活动。

结果 

广义线性混合模型表明 z-BMI 调节性状水平和瞬时关联。当 z-BMI 较高的青少年报告暂时的负面影响时，他们在接下来的一个小时内表现出较少的 MVPA。在整个样本中，更大的整体活动与更低的负面影响相关。然而，在瞬时水平上，当 z-BMI 较高（但不是较低）的青少年表现出更大的活动时，他们报告负面影响有所减少。

结论 

结果表明，围绕身体活动的情感体验因 z-BMI 而异。具体来说，瞬间的负面影响可能会阻碍 z-BMI 较高的年轻人的瞬间 MVPA。需要进一步的研究来阐明影响这些瞬时关联的因素以及这些瞬时关联对体重变化的前瞻性预测程度。