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THE JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS
Rivista di Medicina, Traumatologia e Psicologia dello Sport
Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
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Original articles EPIDEMIOLOGY AND CLINICAL MEDICINE
The Journal of Sports Medicine and Physical Fitness 2006 Giugno;46(2):293-7
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
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.