Environmental exposure to cadmium, forearm bone density, and risk of fractures : prospective population study.
Background Chronic low-level exposure to cadmium may promote calcium loss via urinary excretion.
We undertook a prospective population study to investigate whether environmental exposure to cadmium lowers bone density and increases risk of fractures.
Methods We measured urinary cadmium excretion, a biomarker of lifetime exposure, in people from ten districts of Belgium, of which six districts bordered on three zinc smelters.
We also measured cadmium in soil and in vegetables from the districts, and collected data on incidence of fractures and height loss.
Bone density was measured at the forearm just above the wrist by single photon absorptiometry, and calculated as the mean of six proximal and four distal scans.
Findings Mean cadmium excretion at baseline was 8.7 nmol daily.
Across the ten districts, mean cadmium concentration in soil ranged from 0.8 to 14.7 mg/kg, and from 0.1 to 4.0 mg/kg dry weight in vegetables.
Median follow-up was 6.6 years.
Mean forearm bone density in proximal and distal scans was 0.54 g/cm2 and 0.43 g/cm2 in men, and 0.44 g/cm2 and 0.34 g/cm2 in women.
In postmenopausal women, a twofold increase in urinary cadmium correlated with 0.01 g/cm2 decrease in bone density (p<0.02).
The relative risks associated with doubled urinary cadmium were 1.73 (95% Cl 1.16-2.57 ; p=0.007) for fractures in women and 1.60 (0.94-2.72, p=0.08) for height loss in men.
Cadmium excretion in districts near smelters was 22.8% higher (...)
Mots-clés Pascal : Fracture, Homme, Belgique, Europe, Epidémiologie, Facteur risque, Exposition, Cadmium, Pollution, Environnement, Analyse biochimique, Excrétion, Urine, Spectrométrie absorption, Densité, Os, Intoxication, Toxicologie, Système ostéoarticulaire pathologie, Traumatisme
Mots-clés Pascal anglais : Fracture, Human, Belgium, Europe, Epidemiology, Risk factor, Exposure, Cadmium, Pollution, Environment, Biochemical analysis, Excretion, Urine, Absorption spectrometry, Density, Bone, Poisoning, Toxicology, Diseases of the osteoarticular system, Trauma
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 99-0233942
Code Inist : 002B03L05. Création : 16/11/1999.