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Table 3 Associations between levels of physical activity outside school hours and bone mineral density and content in Norwegian boys 15–18 years. The Tromsø Study, Fit Futures

From: Does the frequency and intensity of physical activity in adolescence have an impact on bone? The Tromsø Study, Fit Futures

  BMD (β coefficient [95 % CI]) BMC (β coefficient [95 % CI])
Femoral neck Total hip Total body Femoral neck Total hip Total body
Physical Activity Frequency (Days a week)  
Model 1  
Seldom Reference
Moderate 0.034 [0.008, 0.060] 0.041 [0.015, 0.068] 0.019 [0.003, 0.034] 0.241 [0.077, 0.404] 1.652 [0.588, 2.716] 65.921 [7.096, 124.747]
High 0.125 [0.096, 0.154] 0.133 [0.103, 0.162] 0.066 [0.049, 0.083] 0.779 [0.599, 0.959] 5.134 [3.962, 6.306] 234.404 [169.38, 299.425]
Model 2  
Seldom Reference
Moderate 0.029 [0.002, 0.056] 0.037 [0.010, 0.064] 0.017 [0.001, 0.033] 0.220 [0.054, 0.386] 1.544 [0.463, 2.626] 59.838 [−0.095, 119.771]
High 0.125 [0.095, 0.155] 0.132 [0.102, 0.161] 0.067 [0.049, 0.084] 0.797 [0.613, 0.980] 5.172 [3.976, 6.368] 241.298 [174.753, 307.843]
Physical Activity Intensity
Model 1  
Not hard Reference
Quite hard 0.042 [0.014, 0.070] 0.052 [0.024, 0.080] 0.023 [0.007, 0.040] 0.311 [0.136, 0.486] 2.068 [0.925, 3.212] 85.706 [23.172, 148.241]
Hard 0.109 [0.081, 0.137] 0.113 [0.085, 0.141] 0.058 [0.042, 0.075] 0.671 [0.497, 0.845] 4.302 [3.166, 5.438] 209.455 [146.958, 271.952]
Model 2  
Not hard Reference
Quite hard 0.033 [0.005, 0.061] 0.045 [0.017, 0.074] 0.020 [0.003, 0.036] 0.266 [0.091, 0.442] 1.817 [0.674, 2.959] 73.031 [10.216, 135.846]
Hard 0.105 [0.076, 0.133] 0.109 [0.080, 0.137] 0.055 [0.038, 0.072] 0.658 [0.481, 0.835] 4.191 [3.043, 5.340] 199.326 [136.122, 262.529]
  1. Model 1: adjusted for age, weight, height
  2. Model 2: Model 1 + sexual maturation, smoking status, alcohol intake
  3. Values significant at p < 0.05 in Italic, values significant at p < 0.001 in Italic Bold