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Bone involution decrease in exercising middle-aged women.

E L Smith, P E Smith, C J Ensign

    Calcified Tissue International
    |January 1, 1984
    PubMed
    Summary
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    Regular physical activity helps prevent bone loss in aging women. Exercise initially led to bone loss but later increased bone mineral density, unlike the control group.

    Area of Science:

    • Gerontology
    • Bone Health
    • Exercise Physiology

    Background:

    • Bone involution, or loss, is a natural aging process.
    • Physical activity is recognized as a key factor in mitigating bone loss.
    • Understanding the impact of exercise on bone density in middle-aged women is crucial.

    Purpose of the Study:

    • To investigate the long-term effects of a structured physical activity program on bone mineral mass in women aged 35-65.
    • To compare bone mineral changes between a group engaging in regular exercise and a control group.

    Main Methods:

    • Longitudinal study over 3-4 years involving 200 women (35-65 years).
    • Bone mineral mass and width of radius, ulna, and humerus measured using single photon absorptiometry.
    • Participants divided into a control group (n=80) and a physical activity group (n=120, exercising 45 min/day, 3 days/week).

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    Main Results:

    • The control group exhibited bone mineral loss consistent with general population rates (e.g., 2.44% annual decline in left radius).
    • The physical activity group showed an initial decline in bone mineral mass in the first year (3.77% in left radius), which was greater than the control group.
    • In years 2 and 3, the physical activity group experienced significant increases in bone mineral mass (1.39% annually in left radius), differing significantly from the control group.

    Conclusions:

    • Physical activity is vital for preventing bone mineral loss in aging women.
    • While initial exercise may lead to temporary bone loss, sustained activity promotes bone mineral gain.
    • Structured exercise interventions can effectively counteract age-related bone involution.