title: The effect of high level physical activity (8.5 METs or greater) and estrogen replacement therapy upon bone mass in postmenopausal females, aged 50-68 years.
abstract: The purpose of this study was to assess the effect of physical activity (PA) and estrogen therapy (ET) upon bone mass at the 1/3 and 4 mm distal radial sites in 50 postmenopausal females. The Ss (means age = 57.4 +/- 5.4 yrs) completed: 1) activity and gynecological surveys, 2) Balke treadmill tests (85% of age determined HR), and 3) single photon absorptiometry measurements of the radius. The activity surveys and treadmill tests were used to categorize Ss into high (8.5 METs or greater, n = 27) and low (6.0 METs or less, n = 23) physical activity groups (HPA/LPA), and the gynecological surveys were used to distinguish Ss who were on estrogen therapy (n = 17) and those who had never been on estrogen therapy (n = 33). Data revealed the HPA group had significantly higher BMC (g/cm) and BMC/BW (g/cm2) at the 1/3 distal radial site than the LPA group (.834 g/cm to .721 g/cm, p less than .01; and .698 g/cm2 to .653 g/cm2, p less than .06, respectively) but were not significantly different at the 4 mm distal site. The ET group had a significantly higher bone mass than the never on ET group for BMC/BW at the 4 mm site (.907 g/cm to .809 g/cm p less than .027). It was concluded that high level physical activity (8.5 METs or greater) or estrogen therapy was helpful in reducing the risk of bone loss in postmenopausal women.
authors.affiliation: University of Texas, Tyler 75701.
authors.forename: J E
authors.initials: JE
authors.lastname: Ballard
authors.forename: B C
authors.initials: BC
authors.lastname: McKeown
authors.forename: H M
authors.initials: HM
authors.lastname: Graham
authors.forename: S A
authors.initials: SA
authors.lastname: Zinkgraf
mesh_terms: D000368:Aged; D015519:Bone Density / Q000502:physiology*; D015914:Estrogen Replacement Therapy; D005080:Exercise Test; D005260:Female; D006801:Humans; D008297:Male; D008593:Menopause / Q000502:physiology*; D008875:Middle Aged; D010024:Osteoporosis / Q000517:prevention & control / Q000628:therapy*; D005082:Physical Exertion / Q000502:physiology*