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Physical activity, diet and skeletal health

Published online by Cambridge University Press:  02 January 2007

Francesco Branca
Francesco Branca*
Affiliation:
National Institute of Nutrition, Via Ardeatina, 546, IT-00179 Rome, Italy
*
*Corresponding author: Email: [email protected]
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Abstract

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Diet and physical exercise concur in the determination of skeletal mass at the end of adolescence and in the conservation of it during adult life. The functional demand imposed on bone is a major determinant of its structural characteristics. Stress applied to a skeletal segment affects the geometry of the bone, the microarchitecture and the composition of the matrix. The stimulatory effect occurs when the skeleton is subjected to strains exceeding habitual skeletal loads, and the intensity of load is more important than the duration of the stimulus.

Physical activity leads to greater bone density in children and adolescents and, to a minor extent, in adults. Weight bearing activities, such as walking, have a greater effect than non weight bearing activities, such as cycling and swimming. Reduction of loads as in bed resting or in space flights leads to bone loss. Intense training may cause damage, promptly repaired, as in stress fractures observed in army recruits. Female athletes may experience oligo-amenorrhea, though they still have a positive bone balance.

There is an important interaction between the mechanical demands and the availability of nutrients to manufacture bone tissue. The increase in bone density in post-menopausal women is positively related to calcium intake when calcium supplementation is accompanied by exercise. When mechanical demands are low, such as during immobilisation, the intestinal calcium absorption is reduced. Calcium intake should also be analysed in the light of other dietary factors affecting the balance between absorption and excretion, and in combination with a number of other minerals, trace elements and bioactive substances with an impact on bone metabolism.

Keywords

Physical activityDietBone massSkeletal healthOsteoporosisMicronutrients
Type
Research Article
Information
Public Health Nutrition , Volume 2 , Supplement 3a , March 1999 , pp. 391 - 396
Copyright
Copyright © CABI Publishing 1999

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