Osteoporosis International

, Volume 16, Issue 12, pp 2129–2141

Exercise frequency and calcium intake predict 4-year bone changes in postmenopausal women

  • Ellen C. Cussler
  • Scott B. Going
  • Linda B. Houtkooper
  • Vanessa A. Stanford
  • Robert M. Blew
  • Hilary G. Flint-Wagner
  • Lauve L. Metcalfe
  • Ji-Eun Choi
  • Timothy G. Lohman
Original Article

Abstract

The aim of this study was to examine the association of exercise frequency and calcium intake (CI) with change in regional and total bone mineral density (BMD) in a group of postmenopausal women completing 4 years of progressive strength training. One hundred sixty-seven calcium-supplemented (800 mg/day) sedentary women (56.1±4.5 years) randomized to a progressive strength training exercise program or to control were followed for 4 years. Fifty-four percent of the women were using hormone therapy (HT) at baseline. At 1 year, controls were permitted to begin the exercise program (crossovers). The final sample included 23 controls, 55 crossovers, and 89 randomized exercisers. Exercisers were instructed to complete two sets of six to eight repetitions of exercises at 70–80% of one repetition maximum, three times weekly. BMD was measured at baseline and thereafter annually using dual-energy X-ray absorptiometry. Four-year percentage exercise frequency (ExFreq) averaged 26.8%±20.1% for crossovers (including the first year at 0%), and 50.4%±26.7% for exercisers. Four-year total CI averaged 1,635±367 mg/day and supplemental calcium intake, 711±174 mg/day. In adjusted multiple linear regression models, ExFreq was positively and significantly related to changes in femur trochanter (FT) and neck (FN), lumbar spine (LS), and total body (TB) BMD. Among HT users, FT BMD increased 1.5%, and FN and LS BMD, 1.2% ( p <0.01) for each standard deviation (SD) of percentage ExFreq (29.5% or 0.9 days/week). HT non-users gained 1.9% and 2.3% BMD at FT and FN, respectively, ( p <0.05) for every SD of CI. The significant, positive, association between BMD change and ExFreq supports the long-term usefulness of strength training exercise for the prevention of osteoporosis in postmenopausal women, especially HT users. The positive relationship of CI to change in BMD among postmenopausal women not using HT has clinical implications in light of recent evidence of an increased health risk associated with HT.

Keywords

Dietary calcium Exercise Hormone therapy Menopause Osteoporosis Strength training BMD 

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Copyright information

© International Osteoporosis Foundation and National Osteoporosis Foundation 2005

Authors and Affiliations

  • Ellen C. Cussler
    • 1
  • Scott B. Going
    • 1
    • 2
  • Linda B. Houtkooper
    • 2
  • Vanessa A. Stanford
    • 2
  • Robert M. Blew
    • 1
  • Hilary G. Flint-Wagner
    • 3
  • Lauve L. Metcalfe
    • 1
  • Ji-Eun Choi
    • 1
  • Timothy G. Lohman
    • 1
    • 4
  1. 1.Department of PhysiologyUniversity of ArizonaTucsonUSA
  2. 2.Department of Nutritional SciencesUniversity of ArizonaTucsonUSA
  3. 3.Department of Health and Nutritional SciencesKasiska College of Health ProfessionsPocatelloUSA
  4. 4.Department of PhysiologyIna Gittings Building, University of ArizonaTucsonUSA

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