RELATIONSHIP BETWEEN BONE MINERAL DENSITY AND BODY COMPOSITION IN ELDERLY

We analyzed 87 medical records and BMD along with the body composition of men ranging from 60 to 87 years of age (mean: 68.5, standard deviation: 6.5). Inclusion criteria were normal BMD values (T-score greater than or equal to -1.0) and body mass index within normal or overweight range (18.5 to 29.5 kg/m²). Body composition was evaluated using bone densitometry with dual-energy X-ray absorptiometry (DEXA) in a LUNAR-DPX apparatus.

Results:

Greater lean mass, fat mass, and soft tissue was associated with better BMD values in older adults, and higher age was associated with poorer BMD.

Conclusion:

Body composition (lean and fat masses and soft tissue) in older men is positively associated with BMD at all body sites (arms, legs, and trunk). Level of Evidence II; Prognostic studies - Investigating the effect of a patient characteristic on the outcome of disease.

Keywords:
Body composition; Bone density; Densitometry; Osteoporosis; Aged

Variable	Group of older adults
Variable	N = 87
	BMD (g/cm²) r(p)
Age	-.263(0.01)*
Anthropometric characteristic
Height (cm)	.221(0.04)*
Weight (kg)	.630(p≤0.001)*
BMI (kg/m²)	.576(p≤0.001)*

		Group of older adults
		N = 87
Region	Variable	BMD (g/cm²2 Johnell O, Kanis JA. An estimate of the worldwide prevalence and disability associated with osteoporotic fractures. Osteoporos Int. 2006;17(12):1726-33.) r (p)
Arm	Fat mass (%)	.264(0.01)*
	Soft tissue (g)	.621(p≤0.001)*
	Fat mass (g)	.432p≤0.001)*
	Lean mass (g)	.579(p≤0.001)*
Leg	Fat mass (%)	.175(0.11)
	Soft tissue (g)	.547(p≤0.001)*
	Fat mass (g)	.352 (0.01)*
	Lean mass (g)	.472(p≤0.001) *
Trunk	Fat mass (%)	.370(.001)*
	Soft tissue (g)	.550(p≤0.001) *
	Fat mass (g)	.422 (p≤0.001)*
	Lean mass (g)	.482(p≤0.001)*
Body -Total	Fat mass (%)	.340(.002)*
	Soft tissue (g)	.600(p≤0.001)*
	Fat mass (g)	.439(p≤0.001)*
	Lean mass (g)	.528(p≤0.001) *

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Variable	Older adults
Variable	Mean (SD)	Minimum	Maximum
Age (years)	68.5(6.5)	60	87
Anthropometric characteristics
Height (cm)	164.7(5.5)	155	180
Weight (kg)	65.4(7.0)	49	81
BMI (kg/m²)	24.0(2.2)	19.8	29.8