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

Zhaoxu Lu1,2, Jin Guo1, Yihua Bao1

  • 1Capital Center for Children's health, Capital Medical University, Capital Institute of Pediatrics, Beijing, China.

International Journal of Obesity (2005)
|November 5, 2025
PubMed

Insights

Increasing moderate-to-vigorous physical activity (MVPA) by reducing sedentary behavior (SB) can improve body composition in preschoolers. This strategy positively impacts fat-free mass and muscle mass indices.

Area of Science:

  • Pediatric obesity research
  • Movement behavior science
  • Body composition analysis

Background:

  • Preschoolers' daily movement behaviors (sedentary behavior, light physical activity, moderate-to-vigorous physical activity, and sleep) are crucial for healthy development.
  • Understanding the relationship between these behaviors and body composition is essential for early intervention strategies.

Purpose of the Study:

  • To analyze the associations between daily movement behaviors and body composition in preschoolers using compositional data analysis.
  • To predict how reallocating time among movement behaviors might alter body composition in this age group.

Main Methods:

  • A cross-sectional study involving 268 preschoolers.
  • Accelerometry for objective measurement of sedentary behavior (SB) and physical activity (PA) levels (light and moderate-to-vigorous).
  • Bioelectrical impedance analysis for assessing body composition and compositional data analysis techniques (linear regression and isotemporal substitution) to examine associations and predict changes.

Main Results:

  • Movement behaviors composition significantly predicted fat-free mass index (FFMI), soft lean mass index (SLMI), and skeletal muscle mass index (SMMI).
  • Increasing moderate-to-vigorous physical activity (MVPA) at the expense of SB was positively associated with FFMI, SLMI, and SMMI.
  • The positive effects of substituting SB with MVPA were asymmetrical, with smaller benefits than the detriments from decreasing MVPA.

Conclusions:

  • Moderate-to-vigorous physical activity (MVPA) plays a vital role in enhancing preschoolers' body composition.
  • Increasing MVPA while reducing sedentary behavior (SB) is a potential strategy for improving body composition in young children.
Abstract

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