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Physical activity, sedentary time, and longitudinal bone strength in adolescent girls

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Abstract

Summary

The association between baseline physical activity and sedentary time with 2-year longitudinal bone strength was evaluated. The effect of physical activity on bone depended on maturity status. Sedentary time did not negatively impact bone outcomes, regardless of maturity. Maturity should be considered when developing exercise interventions to improve bone outcomes.

Introduction

Physical activity during adolescence is important to obtain peak bone mass; however, adolescents are increasingly sedentary, potentially increasing risk for osteoporosis later in life. The aim of this study was to assess the association of physical activity and sedentary time with 2-year longitudinal bone outcomes in adolescent females (69% Hispanic/31% non-Hispanic).

Methods

Bone strength was assessed at the 66% tibia, 20% femur, and 66% radius of 9- to 12-year-old girls (n = 131) using peripheral quantitative computed tomography at baseline and 2-year follow-up. Physical activity and sedentary time were assessed via accelerometry. Linear regression analyses were used to assess whether baseline vigorous physical activity (VPA), moderate physical activity (MPA), light physical activity (LPA), or sedentary time predict longitudinal bone outcomes, adjusting for relevant confounders.

Results

Significant interactions were found between maturity offset and physical activity. In weight-bearing bones, significant interactions were primarily identified between VPA and maturity offset. Interactions indicated that VPA was associated with favorable bone outcomes at the tibia and femur in girls further past the age of PHV. However, this favorable effect was not observed in girls closer to the age of PHV. At the radius, interactions were primarily observed between LPA and maturity offset. Again, LPA was more beneficial for girls further past the age of PHV. Sedentary time did not significantly influence bone outcomes.

Conclusion

The effects of physical activity on bone may be dependent on maturity. Therefore, physical activity interventions, with attention to maturity status, may be required to optimize bone strength in girls.

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Acknowledgments

This study was executed at the University of Arizona, Collaboratory for Metabolic Disease Prevention and Treatment.

Funding

This study was funded by the National Institute of Child Health and Human Development (Award #HD074565).

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Correspondence to V.L. Bland.

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The study protocol was approved by the University of Arizona Human Subjects Protection Committee. Written informed assent and consent was obtained from all participants and their parents or legal guardians, respectively.

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Bland, V., Bea, J., Roe, D. et al. Physical activity, sedentary time, and longitudinal bone strength in adolescent girls. Osteoporos Int 31, 1943–1954 (2020). https://doi.org/10.1007/s00198-020-05406-z

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