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Original articles  EPIDEMIOLOGY AND CLINICAL MEDICINE


The Journal of Sports Medicine and Physical Fitness 2006 June;46(2):293-7

language: English

Relationships between bone mineral density, insulin-like growth factor-1 and sex hormones in young females with different physical activity

Sööt T. 1, Jürimäe T. 1, Jürimäe J. 2

1 Sport Pedagogy Unit, Centre of Behavioural and Health Sciences Faculty of Exercise and Sport Sciences University of Tartu, Tartu, Estonia
2 Coaching Sciences Unit Centre of Behavioural and Health Sciences Faculty of Exercise and Sport Sciences University of Tartu, Tartu, Estonia


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Aim. To study the possible relationships between bone mineral density (BMD) and blood concentrations of estradiol, progesterone and IGF-1 in strength and endurance trained and sedentary normal or overweight young females.
Methods. One hundred and twenty-nine females participated in this study and were divided into the following groups: strength trained (n=33), endurance trained (n=32), normal weight sedentary (n=42) and overweight sedentary (n=23) females. Body composition and BMD (total, dominant arm distal radius, antero-posterior lumbar spine [L2-L4] and femoral neck) values were measured using DXA. The concentrations of estradiol, progesterone and IGF-1 were measured in the blood.
Results. Normal weight sedentary females had lower values in BMD in sites L2-L4, femoral neck and total BMD compared to strength trained females. Overweight sedentary females had higher BMD in sites L2-L4 and total BMD compared to normal weight sedentary females. In endurance trained females, progesterone was significantly related to femoral neck BMD (r=0.76). In normal weight sedentary females, IGF-1 was significantly related to femoral neck (r =0.4) and distal radius BMD (r=0.4), and in overweight females to distal radius BMD (r=0.57).
Conclusion. It was concluded that in young differently physically active females with optimal BMD, regular menstrual cycle and blood sex hormones and IGF-1, the relationship between BMD and blood biochemical parameters is not very strong. In physically inactive groups, only IGF-1 concentration influenced BMD in weight-bearing or non weight-bearing sites.

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