Physical activity and the young female skeleton
Research output: Thesis › Doctoral Thesis (compilation)
The aim of this thesis was to identify the influence of calcium, physical activity and detraining on bone mass and bone size in girls and young women. We hypothesised that calcium intake above a specific level does not enhance the accrual of bone mineral, that exercise predominantly influences the skeleton in the early pubertal period and that reduced training is followed by a loss of exercise-induced skeletal benefits. To scrutinise our hypothesis we followed 103 girls aged 7-9 in a 1-year prospective controlled exercise intervention study, 78 girls aged 13-15 in a 5-year and 130 females aged 13-54 in a 8-year prospective observational study. It seems that an exercise intervention programme during the first school year increases the accrual of bone mass and the gain in bone size. Continued physical activity in the peri- and post-pubertal period seems to be associated with maintenance of a high bone mass. It appears that the bone mass could be enhanced by increasing the intake of calcium in adolescent girls consuming less than 800 to 1000 mg per day. It seems as if exercise-induced benefits in bone mass could be achieved also in post-pubertal women but that the benefits are at least partially reduced with detraining. The thesis supports the view that physical activity could be recommended to increase peak bone mass but it must be further validated whether exercise during growth could be recommended to remain at a high bone mass level decades after an exercise career.
|Research areas and keywords||
Subject classification (UKÄ) – MANDATORY
|Award date||2005 May 19|
|Publication status||Published - 2005|
Defence details Date: 2005-05-19 Time: 09:00 Place: Medicinska aulan ing 33 Universitetssjukhuset Malmö External reviewer(s) Name: Nordström, Peter Title: MD, PhD Affiliation: Geriatrics ---
JÖ Kristinsson, Ö Valdimarsson, L Steingrimsdottir and G Sigurdsson. 1994. Relation between calcium intake, grip strength and bone mineral density in the forearms of girls aged 13 and 15. Journal of Internal Medicine, vol 236 pp 385-390.
Ö Valdimarsson, JÖ Kristinsson, SÖ Stefansson, S Valdimarsson and G Sigurdsson. 1999. Lean mass and physical activity as predictors of bone mineral density in 16-20-year old women. Journal of Internal Medicine, vol 245 pp 489-496.
Ö Valdimarsson, G Sigurdsson, L Steingrímsdóttir and K. M. Karlsson. 2005. Physical Activity in the Post-Pubertal Period is Associated with Maintenance of Pre-Pubertal High Bone Density - a 5-Year Follow-up: The Scandinavian Journal of Sport Medicine., vol Online publication 8 Feb.
Ö Valdimarsson, H Ahlborg, H Düppe, F Nyquist and K. M. Karlsson. 2005. Reduced Training is Associated with Increased Loss of Bone Mineral Density. Journal of Bone and Mineral Research, vol Online publication 19 Jan.
Ö Valdimarsson, C Linden, O Johnell, P Gardsell and K. M. Karlsson. . Daily Physical Education in the School Curriculum in Prepubertal Girls for One Year is Followed by an Increase in Bone Mineral Accrual and Bone Size. Data from the Prospective Controlled Malmö Pediatric Osteoporosis Prevention (POP) Study. (submitted)The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Orthopaedics (013242900), Reconstructive Surgery (013240300)