title: Early smoking is associated with peak bone mass and prevalent fractures in young, healthy men.
abstract: Smoking is associated with lower areal bone mineral density (aBMD) and higher fracture risk, although most evidence has been derived from studies in elderly subjects. This study investigates smoking habits in relation to areal and volumetric bone parameters and fracture prevalence in young, healthy males at peak bone mass. Healthy male siblings (n = 677) at the age of peak bone mass (25 to 45 years) were recruited in a cross-sectional population-based study. Trabecular and cortical bone parameters of the radius and cortical bone parameters of the tibia were assessed using peripheral quantitative computed tomography (pQCT). Areal bone mass was determined using dual energy X-ray absorptiometry (DXA). Sex steroids and bone markers were determined using immunoassays. Prevalent fractures and smoking habits were assessed using questionnaires. Self-reported fractures were more prevalent in the current and early smokers than in the never smokers (p < .05), with a fracture prevalence odds ratio for early smokers of 1.96 (95% confidence interval 1.18-3.24) after adjustment for age, weight, educational level, and alcohol use and exclusion of childhood fractures. Current smoking was associated with a larger endosteal circumference (beta = 0.027 +/- 0.009, p = .016) and a decreased cortical thickness (beta = -0.034 +/- 0.01, p = .020) at the tibia. In particular, early smokers (< or =16 years) had a high fracture risk and lower areal BMD, together with a lower cortical bone area at the tibia and lower trabecular and cortical bone density at the radius. An interaction between free estradiol and current smoking was observed in statistical models predicting cortical area and thickness (beta = 0.29 +/- 0.11, p = .01). In conclusion, smoking at a young age is associated with unfavorable bone geometry and density and is associated with increased fracture prevalence, providing arguments for a disturbed acquisition of peak bone mass during puberty by smoking, possibly owing to an interaction with sex steroid action.
authors: Department of Endocrinology, Ghent University Hospital, Belgium. Youri.Taes@ugent.be
authors: Youri
authors: Y
authors: Taes
authors: Bruno
authors: B
authors: Lapauw
authors: Griet
authors: G
authors: Vanbillemont
authors: Veerle
authors: V
authors: Bogaert
authors: Dirk
authors: D
authors: De Bacquer
authors: Stefan
authors: S
authors: Goemaere
authors: Hans
authors: H
authors: Zmierczak
authors: Jean-Marc
authors: JM
authors: Kaufman
mesh_terms: D015502:Absorptiometry, Photon; D000328:Adult; D015519:Bone Density; D005190:Family; D050723:Fractures, Bone / Q000453:epidemiology / Q000209:etiology*; D012739:Gonadal Steroid Hormones / Q000378:metabolism; D006801:Humans; D008297:Male; D009043:Motor Activity / Q000502:physiology; D012307:Risk Factors; D012907:Smoking / Q000009:adverse effects; D011795:Surveys and Questionnaires; D014057:Tomography, X-Ray Computed
chemical_list: D012739:Gonadal Steroid Hormones