First we have to take into account that the growth of bone mass is acquired until the third decade and remains more or less constant until 50 and then begins to decline, there are few studies that have highlighted that the intake of calcium with physical activity completed in the first 30 years of life allows these individuals end up at that age with a higher bone mass, cross-sectional studies have also shown that subjects until 50 years of age who participate in exercise programs have an average between 8 and 12% higher BMD than their peers without exercise, after 50 years this difference is only 6%. In subjects over 50 years has been observed in 1% increments in BMD (4).
26 children under 11 years were subjected to a gymnastics training 3 hours per day and three hours watching television. A second group of the same age was only 1 hour a day of intense exercise and 4 hours of television. We obtained a much higher correlation between BMD and number of hours of exercise in the most active group of both arms and spine. The Amsterdam study on the health and growth habit of life correlated with lumbar BMD at 30 years of age.
