A 1-y walking program and increased dietary calcium in postmenopausal women: effects on bone

• Published in: The American journal of clinical nutrition Vol. 53; no. 5; pp. 1304 - 1311
• Main Authors: Nelson, ME, Fisher, EC, Dilmanian, FA, Dallal, GE, Evans, WJ
• Format: Journal Article
• Language: English
• Published: Bethesda, MD Elsevier Inc 01.05.1991; American Society for Clinical Nutrition
• Subjects: ABSORCION DE SUBSTANCIAS NUTRITIVAS; Absorptiometry, Photon; ABSORPTION DE SUBSTANCES NUTRITIVES; ACTIVIDAD FISICA; ACTIVITE PHYSIQUE; ADULTE; ADULTOS; Aged; Analysis of Variance; Biological and medical sciences; body composition; Bone Density; CALCIO; CALCIUM; Calcium, Dietary - therapeutic use; CONTENIDO DE CENIZA; DENSIDAD; DENSITE; Diet; Double-Blind Method; dual-photon absorptiometry; EPINE DORSALE; ESPINA DORSAL; Exercise; Female; FEMME; Femur Neck; General and cellular metabolism. Vitamins; HUESOS; HUESOS DE LOS MIEMBROS; Humans; in vivo neutron-activation analysis; LAIT; LECHE; Lumbar Vertebrae; MASSACHUSETTS; Medical sciences; Middle Aged; MINERALES; MINERAUX; MUJERES; OS DES MEMBRES; osteoporosis; Osteoporosis, Postmenopausal - prevention & control; Pharmacology. Drug treatments; quantitative computed tomography; RADIO; RADIUM; Radius; SERUM SANGUIN; single-photon absorptiometry; SUERO SANGUINEO; TENEUR EN CENDRES; VITAMINA D; VITAMINE D; Walking; body composition; Exercise; single-photon absorptiometry; dual-photon absorptiometry; diet; osteoporosis; quantitative computed tomography; in vivo neutron-activation analysis; Human; Prevention; Osteoporosis; Chemotherapy; Treatment; Calcium; Diseases of the osteoarticular system; Postmenopause; Female; Bone; Metabolism; Body composition
• ISSN: 0002-9165; 1938-3207
• DOI: 10.1093/ajcn/53.5.1304

The effects of a supervised 1-y walking program and increased dietary calcium (milk supplement, 831 mg/d, vs placebo drink, 41 mg/d) on bones were examined in 36 postmenopausal women (60.2 ±6.5 y). Trabecular bone-mineral density (BMD) of the lumbar spine (L1−L3), measured by computed tomography, increased by 0.5% in exercising women (n = 18) and decreased by 7.0% in sedentary women (n = 18; P = 0.02). Femoral-neck BMD measured by dual-photon absorptiometry (DPA) increased by 2.0% in women consuming high dietary calcium (n = 18) and decreased by 1.1% in those on moderate calcium intake (n = 18; P = 0.001). Neither exercise nor dietary calcium had an effect on lumbar spine (L2−L4) measured by DPA, distal radius measured by single-photon absorptiometry, or total body calcium measured by in vivo neutron activation. The varying proportions and rates of turnover of trabecular and cortical bone from one site to another suggest that exercise and high dietary calcium may preferentially alter bone density at different skeletal sites.