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Association of objectively measured physical activity and sedentary behavior with bone stiffness in peripubertal

Mitsuya Yamakita1, Daisuke Ando2, Yuka Akiyama3

  • 1College of Liberal Arts and Sciences, Kitasato University, Sagamihara, Kanagawa, 252-0373, Japan. yamakita@kitasato-u.ac.jp.

Journal of Bone and Mineral Metabolism
|June 20, 2019
PubMed

Insights

Moderate-to-vigorous physical activity (MVPA) boosts bone stiffness in boys. Sedentary behavior (SB) is linked to lower bone stiffness in girls, suggesting SB reduction may aid peak bone mass development.

Area of Science:

  • Pediatric Bone Health
  • Physical Activity and Health
  • Childhood Development

Background:

  • Physical activity (PA) is crucial for bone mass acquisition in peripubertal children.
  • Sedentary behavior (SB) significantly impacts bone health outcomes.
  • Understanding PA and SB's role in bone development is vital for public health.

Purpose of the Study:

  • To investigate the association between objectively measured PA and SB and bone stiffness in Japanese children.
  • To determine if higher levels of PA and lower levels of SB correlate with improved bone stiffness.
  • To explore sex-specific differences in these associations.

Main Methods:

  • Quantitative ultrasound measured calcaneal stiffness index (SI) in 134 fifth-grade children (10-11 years).
  • Accelerometers objectively assessed PA and SB.
  • Data analyzed using ANCOVA, stratifying by sex-specific PA guidelines and tertiles.

Main Results:

  • Boys in the highest tertile of moderate-to-vigorous PA (MVPA) showed significantly higher SI.
  • Girls exhibited a significant negative trend between increasing SB and decreasing SI.
  • Meeting PA guidelines showed a positive but non-significant trend in SI for all children.

Conclusions:

  • Higher MVPA is positively associated with bone stiffness in Japanese boys.
  • Increased SB is negatively associated with bone stiffness in Japanese girls.
  • Reducing SB may be a key modifiable factor for enhancing peak bone mass in girls, alongside increasing MVPA.
Abstract

Keywords:
Bone stiffnessPhysical activityQuantitative ultrasoundSchoolchildrenSedentary time

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