Physical activity and dark skin tone: protective factors against low bone mass in Mexican men.
A cross-sectional study was conducted on 268 Mexican men between the ages of 13 and 80 yr to evaluate the association of clinical factors related with bone mass. Men from high schools, universities, and retirement homes were invited to participate. Body mass index (BMI) was measured, and bone mineral density (BMD) was assessed using dual-energy X-ray absorptiometry for L1-L4 and total hip. Factors related to bone mass were assessed by questionnaire and analyzed using a logistic regression model. Demographic factors (age, education, and occupation), clinical data (BMI, skin tone, previous fracture, history of osteoporosis [OP], and history of fractures), and lifestyle variables (diet, physical activity, sun exposure, and smoking) were evaluated. Physical activity (≥ 60 min/5 times a week) reduced the risk for low BMD for age, osteopenia, and OP at the spine and total hip (odds ratio [OR]: 0.276; 95% confidence interval [CI]: 0.099-0.769; p=0.014; and OR: 0.184; 95% CI: 0.04-0.849; p=0.03, respectively). Dark skin tone was a protective factor, decreasing the risk by up to 70%. In this population of healthy Mexican men (aged 13-80 yr), dark skin and physical activity were protective factors against low bone mass.
Clinical Epidemiology Unit, Hospital Infantil de México "Federico Gómez"-Facultad de Medicina UNAM, Mexico City, Mexico.
Nalleli
N
Vivanco-Muñoz
Talavera
T
Jo
Huitron-Bravo
HB
Gerardo
Tamayo
T
Juan
Patricia
P
Clark
D000328:Adult; D015519:Bone Density / Q000502:physiology*; D001851:Bone Diseases, Metabolic / Q000453:epidemiology*; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008800:Mexico; D008875:Middle Aged; D009043:Motor Activity / Q000502:physiology*; D010024:Osteoporosis / Q000453:epidemiology; D012307:Risk Factors; D012880:Skin Pigmentation / Q000502:physiology*