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Objectives <p>To use compositional data analysis to examine the associations of daily movement behaviors with body composition, and to predict changes in body composition after reallocating time among behaviors in preschool-aged children.</p> Methods <p>268 preschoolers were included in the cross-sectional study. An accelerometer was used to assess sedentary behavior (SB), light and moderate-to-vigorous physical activity (LPA and MVPA). A parental report was used to collect sleep time. Bioelectrical impedance analysis was employed to assess body composition. Compositional linear regression analysis was employed to explore how daily movement behaviors were associated with body composition. Compositional isotemporal substitution analysis was employed to estimate changes in body composition after reallocating time among behaviors.</p> Results <p>24-h movement behaviors composition significantly predicted fat-free mass index (FFMI), soft lean mass index (SLMI), and skeletal muscle mass index (SMMI), but not fat mass index, percent body fat, and bone mineral content index. The compositional isotemporal substitution analyses consistently showed that increasing MVPA at the expenses of SB was positively associated with FFMI (+0.328 kg/m<sup>2</sup>, 95% CI: 0.063~0.593), SLMI (+0.317 kg/m<sup>2</sup>, 95% CI: 0.067~0.567), and SMMI (+0.254 kg/m<sup>2</sup>, 95% CI: 0.091~0.417). These associations were asymmetrical: the predicted benefits to body composition from substituting SB with MVPA were smaller than the predicted detriments related to decreasing MVPA of the same magnitude.</p> Conclusions <p>The findings highlight the importance of MVPA in improving preschoolers’ body composition. Increasing MVPA at the expenses of SB may be a strategy to improve body composition in preschoolers.</p>

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Are reallocating time to moderate-to-vigorous physical activity associated with preschoolers’ body composition?

  • 期刊论文

  • 发表日期：

    2025年11月5日

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  • Zhaoxu Lu,
  • Jin Guo,
  • Yihua Bao,
  • Chuo Zhao,
  • Haowen Zhang,
  • Wei Chen,
  • Jiahui Chang,
  • Shan Wang,
  • Hongyan Guan,
  • Yanpeng Ni,
  • Jianwei Li,
  • Xiaolin Zhou,
  • Di Heng,
  • Jianxin Wu,
  • Fang Wang,
  • Ting Zhang

摘要

Objectives

To use compositional data analysis to examine the associations of daily movement behaviors with body composition, and to predict changes in body composition after reallocating time among behaviors in preschool-aged children.

Methods

268 preschoolers were included in the cross-sectional study. An accelerometer was used to assess sedentary behavior (SB), light and moderate-to-vigorous physical activity (LPA and MVPA). A parental report was used to collect sleep time. Bioelectrical impedance analysis was employed to assess body composition. Compositional linear regression analysis was employed to explore how daily movement behaviors were associated with body composition. Compositional isotemporal substitution analysis was employed to estimate changes in body composition after reallocating time among behaviors.

Results

24-h movement behaviors composition significantly predicted fat-free mass index (FFMI), soft lean mass index (SLMI), and skeletal muscle mass index (SMMI), but not fat mass index, percent body fat, and bone mineral content index. The compositional isotemporal substitution analyses consistently showed that increasing MVPA at the expenses of SB was positively associated with FFMI (+0.328 kg/m2, 95% CI: 0.063~0.593), SLMI (+0.317 kg/m2, 95% CI: 0.067~0.567), and SMMI (+0.254 kg/m2, 95% CI: 0.091~0.417). These associations were asymmetrical: the predicted benefits to body composition from substituting SB with MVPA were smaller than the predicted detriments related to decreasing MVPA of the same magnitude.

Conclusions

The findings highlight the importance of MVPA in improving preschoolers’ body composition. Increasing MVPA at the expenses of SB may be a strategy to improve body composition in preschoolers.