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Association between sedentary behavior and bone mass in adolescents.

A Pelegrini1, J A Klen2, A M Costa2

  • 1State University of Santa Catarina (UDESC), Florianópolis, Santa Catarina, Brazil. andreia.pelegrini@udesc.br.

Osteoporosis International : a Journal Established As Result of Cooperation Between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA
|April 30, 2020
PubMed
Summary

Sedentary behavior, particularly internet use for non-school purposes, is linked to higher bone mineral density (BMD) and content (BMC) in adolescents. However, excessive computer time may negatively impact bone health in normal-weight youth.

Keywords:
Bone mineral contentBone mineral densityOsteoporosisScreen timeYouth

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Area of Science:

  • Pediatric Bone Health
  • Adolescent Health Behaviors
  • Sedentary Lifestyle Research

Background:

  • The impact of sedentary behavior on adolescent bone health remains debated.
  • Some specific sedentary activities may not negatively affect bone health, even in normal-weight individuals.

Purpose of the Study:

  • To investigate the association between various sedentary behaviors and bone mass in adolescents.
  • To differentiate effects based on weight status (normal weight vs. overweight).

Main Methods:

  • 104 adolescents (10-14 years) categorized by weight status.
  • Sedentary behaviors assessed via questionnaire (internet, computer, TV, video games) and accelerometry.
  • Bone mineral density (BMD) and bone mineral content (BMC) measured using X-ray absorptiometry.

Main Results:

  • Internet use for non-school purposes positively correlated with total and lumbar BMD in all adolescents.
  • Overweight adolescents showed a negative correlation between computer use and lumbar BMD.
  • Internet use for non-school purposes positively correlated with total and lumbar BMC in overweight adolescents and lumbar BMC in normal-weight adolescents.

Conclusions:

  • Increased sedentary time, especially non-school internet use, is associated with enhanced bone mineral density and content in adolescents.
  • Excessive computer use may be detrimental to bone mineral density in normal-weight adolescents.