Authors: Miller, Larry¹; Pierson, Lee²; Pierson, Mary³; Kiebzak, Gary⁴; Ramp, Warren⁵; Herbert, William⁶; Cook, Joseph⁷

Source: The Aging Male, Volume 12, Numbers 2-3, June 2009 , pp. 47-53(7)

Publisher: Informa Healthcare

Abstract:

Objective. This study assessed the influence of age on the predictors of bone mineral in men. Methods. Middle-age (n = 41, 54 ± 4 yrs) and older (n = 40, 69 ± 5 yrs) men underwent grip and knee extensor strength tests, total body dual-energy X-ray absorptiometry with regional analyses and a graded exercise treadmill test. Results. Bone-free lean mass (BFLM) and, to a lesser extent, fat mass (FM) were correlated with bone mineral variables in middle-age men. In older men, BFLM and, to a lesser extent, FM were related to bone mineral content (BMC) at most sites, but inconsistently to bone mineral density (BMD). Knee extensor strength related to bone mineral (BMC and BMD) at most sites in middle-age men, but none in older men. Grip strength inconsistently related to bone mineral in both groups. Aerobic capacity related to bone mineral in middle-age men, but none in older men. In multiple regression, body weight or BFLM predicted bone mineral in middle-age men (R2 = 0.33-0.68) and BMC in older men (R2 = 0.33-0.50). Predictors of BMD were inconsistent in older men. Conclusions. Relationships of body composition, muscular strength and aerobic capacity to bone mineral are stronger in middle-age versus older men.

Keywords: Body composition; bone density; male; muscular strength; osteoporosis

Document Type: Research article

DOI: http://dx.doi.org/10.1080/13685530903033216

Affiliations: 1: Department of Human Nutrition, Foods and Exercise, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA 2: University of North Carolina School of Medicine, Chapel Hill, North Carolina, USA 3: Carolinas Medical Center, Charlotte, North Carolina, USA 4: Center for Orthopaedic Research and Education, St. Luke's Episcopal Hospital, Houston, Texas, USA 5: Health Research Group, LLC, Rockbridge Baths, Virginia, USA 6: Department of Human Nutrition, Foods and Exercise, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA,Health Research Group, LLC, Rockbridge Baths, Virginia, USA 7: Sanger Clinic, Charlotte, North Carolina, USA

Publication date: 2009-06-01

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