BMI and body composition as determinants of femoral bone mineral density in men over 60

• Published in: Human Movement Vol. 7; no. 1
• Main Authors: Maciaszek, J, Szeklicki, R, Osinski, W, Sufinowicz, M, Leszczynski, P
• Format: Journal Article
• Language: English
• Published: 01.01.2006
• ISSN: 1732-3991

Purpose The aim of the study was to analyse the relations between the height, body mass, BMI, body composition and the bone mineral density (BMD) of the femur in men over 60 years of age. Basic procedures The study material included 126 men (x = 69.30 plus or minus 5.82 years of age). Body composition (fat mass, fat free mass, muscle mass) was measured using bioimpedance (Akern - RJL System - BIA 100/s). Femoral bone mineral density in the areas of femoral neck (BMD1) and trochanter major (BMD2) was measured using the densitometric diagnostic equipment (DXA) by Norland Medical Systems. Main findings The nonlinear regression analysis often recognized the considered relationships as second degree equations. The relations between BMD1 and body mass (D = 21.8%), BMI (D = 20.7%), fat mass (D = 12.8%) and muscle mass (D = 12.8%), and between BMD2 and BMI (D = 29.6%), fat mass (D = 17.4%) and muscle mass (D = 18.9%) are described by a quadratic equation. Thus, the increase in bone mineralisation co-occurs with the increase in body mass, BMI, fat mass and muscle mass only to certain values. After exceeding an optimal level, the value of BMD lowers. Conclusions Special attention should be paid to the maximum values (x sub(w) of functions describing the relations of the BMD and BMI. In the studied group of elderly men, the maximum BMD1 was noted with a relatively high BMI = 32.3 kg/m super(2), and the highest values of BMD2 were observed even with BMI = 34 kg/m super(2). But with any increase in the BMI above x sub(w), lowering of BMD1 and BMD2 was observed.