University of Toronto.
University of Ottawa.
Pediatr Exerc Sci. 2020 May 1;32(2):105-111. doi: 10.1123/pes.2019-0184. Epub 2020 Mar 9.
This study examined the association between self-perceived actual and ideal body sizes and objectively assessed moderate-to-vigorous physical activity (MVPA) among adolescents, controlling for puberty, fat mass index, and sex. A secondary objective was to explore the association between objectively assessed fat mass index and MVPA.
Participants were 438 early adolescents (Mage = 11.61, SD = 0.92). Participants selected body sizes that represented their self-perceived actual and ideal bodies. Participants then wore an accelerometer for 1 week to assess MVPA. Polynomial regression analysis with response surface methods was used to explore MVPA in relation to the discrepancy and agreement (ie, no discrepancy) between self-perceived actual and ideal body sizes.
When self-perceived actual and ideal body sizes were in agreement and represented smaller and larger bodies, MVPA was low. Participants with similar self-perceived actual and ideal bodies in the middle of the body-size spectrum demonstrated the highest levels of MVPA. The direction and degree of the discrepancy between self-perceived actual and ideal bodies were not significantly associated with MVPA. Fat mass index was significantly and negatively associated with MVPA.
These findings may inform physical activity promotion programs and provide methodological contributions to the study of how body image and MVPA are related.
本研究旨在探讨青少年自我感知的实际和理想体型与中高强度体力活动（MVPA）之间的关系，同时控制青春期、体脂指数和性别等因素。本研究的次要目的是探讨客观评估的体脂指数与 MVPA 之间的关系。
参与者为 438 名早期青少年（Mage=11.61，SD=0.92）。参与者选择代表自我感知的实际和理想体型的身体尺寸。然后，参与者佩戴加速度计一周，以评估 MVPA。采用多项式回归分析和响应面方法，探讨自我感知的实际和理想体型之间的差异和一致性（即无差异）与 MVPA 的关系。
当自我感知的实际和理想体型一致且代表较小和较大体型时，MVPA 水平较低。在体型谱中间具有相似自我感知的实际和理想体型的参与者表现出最高水平的 MVPA。自我感知的实际和理想体型之间的差异的方向和程度与 MVPA 无显著相关性。体脂指数与 MVPA 呈显著负相关。
这些发现可能为促进身体活动的计划提供信息，并为研究身体形象和 MVPA 之间的关系提供方法学贡献。
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