8 research outputs found

    Physical activity and bone mineral accrual in boys with different body mass parameters during puberty: a longitudinal study.

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    The aim of our longitudinal study was to investigate the relationships between physical activity and bone mass in boys with different body mass status during the years surrounding pubertal growth spurt. Two hundred and six boys entering puberty took part in this study. The subjects were divided into underweight (BMI < 15.35), normal weight (BMI ≥ 15.35-21.22), overweight (BMI ≥ 21.22-26.02) and obese (BMI > 26.02) groups at baseline according to age related categories. Whole-body DXA scans were performed at baseline, after 12 and 24 months to assess body composition (lean body mass, fat mass), and total body (TB), lumbar spine (LS) and femoral neck (FN) bone mineral density (BMD) parameters. Physical activity was measured by 7-day accelerometry. For longitudinal analysis, multilevel fixed effects regression models were constructed. Biological age, height and lean body mass had an effect for explanation of TB BMD, FN BMD and LS BMD. Moderate to vigorous physical activity (MVPA), vigorous physical activity (VPA) and sedentary time (SED) had the significant effect only on FN BMD. Being an underweight boy at the baseline indicated greater chance (p<0.01) to have lower TB BMD in the future (2 years at follow up) development, compared to normal weight (estimates = -0.038), overweight (estimates = -0.061) and obese boys (estimates = -0.106)

    TB BMD changes during pubertal growth spurt.

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    <p>Comparing four different groups – underweight, normal weight, overweight and obese pubertal boys. APHV - age of peak height velocity.</p

    Multilevel regression model for TB BMD, FN BMD and LS BMD controlling for biological age, height, lean body mass and testing for SED and MVPA.

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    <p>SE is standard error. Biological age - years from age at peak height velocity (APHV). SED - sedentary time. MVPA - moderate to vigorous physical activity. Group effect is four different groups according to baseline BMI.</p><p>Multilevel regression model for TB BMD, FN BMD and LS BMD controlling for biological age, height, lean body mass and testing for SED and MVPA.</p

    Multilevel regression model for TB BMD, FN BMD and LS BMD values when controlling for biological age, height, lean mass and testing for SED and VPA.

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    <p>SE is standard error. Biological age - years from age at peak height velocity (APHV). SED - sedentary time. VPA - vigorous physical activity. Group effect is four different groups according to baseline BMI.</p><p>Multilevel regression model for TB BMD, FN BMD and LS BMD values when controlling for biological age, height, lean mass and testing for SED and VPA.</p

    The change of PA levels during the study period in four different groups of participants.

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    a<p>Significantly different from underweight boys;</p>b<p>significantly different from normal weight boys; (P<0.05);</p>1<p>significantly different from baseline PA level;</p>2<p>significantly different from PA level after 12 month;</p><p>SED, sedentary time; LPA, light physical activity; MPA, moderate physical activity; VPA, vigorous physical activity; MVPA, moderate to vigorous physical activity.</p><p>The change of PA levels during the study period in four different groups of participants.</p

    Mean (± SD) characteristics of the subjects at baseline measurement.

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    a<p>Significantly different from underweight boys;</p>b<p>significantly different from normal weight boys;</p>c<p>significantly different from overweight boys;</p>d<p>significantly different from obese boys (P<0.05);</p><p>Biological age is years from APHV (age at peak height velocity); BMI, body mass index; TB BMD, total body bone mineral density; FN BMD, femoral neck bone mineral density; LS BMD, lumbar spine bone mineral density; SED, sedentary time; MVPA, moderate and vigorous physical activity.</p><p>Mean (± SD) characteristics of the subjects at baseline measurement.</p
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