Exercise Helps Bones, but Not Metabolism, in Ovarian Function Loss: Study

by Colleen Fleiss on  October 2, 2018 at 8:57 AM Women Health News
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In women with menopause, exercise may reduce the risk of osteoporosis linked to the loss of ovarian function, but fitness may not protect against related metabolic changes and weight gain, stated new study.
Exercise Helps Bones, but Not Metabolism, in Ovarian Function Loss: Study
Exercise Helps Bones, but Not Metabolism, in Ovarian Function Loss: Study

The findings will be presented today at the American Physiological Society's (APS) Cardiovascular, Renal and Metabolic Diseases: Sex-Specific Implications for Physiology conference in Knoxville, Tenn.

The drop in estrogen that occurs with loss of ovarian function affects the skeletal system. However, the effect of estrogen deficiency on other body systems is less clear. Researchers from the University of Colorado, Denver School of Medicine, studied premenopausal women to determine the role of estrogen and exercise in metabolic rate and energy balance in the body. Energy balance refers to the amount of calories taken in through food in comparison to those burned through physical activity.

All of the women studied had temporary loss of ovarian function (ovarian suppression) that diminished estrogen levels. One group of women received estrogen supplementation and also performed supervised resistance exercise. Another group received hormone therapy but did not exercise. The estrogen supplement groups were compared with ovarian suppression control groups that did not receive hormone therapy but were matched for exercise status. The research team measured bone loss through imaging tests (DEXA scans) and energy expenditure through doubly labeled water--a special type of water that contains varied forms of hydrogen and oxygen to allow for energy tracking.

All of the volunteers had a slower metabolism, burned fewer calories and showed a decrease in muscle mass and an accumulation of belly fat due to the loss of ovarian function. These symptoms were prevented by estrogen therapy. The groups that exercised were protected against the decrease in bone density but not the changes in the other symptoms. "Our findings suggest that exercise can attenuate some (e.g. loss of bone) but not all (e.g., decline in resting metabolic rate) of the consequences of ovarian hormone suppression," the researchers wrote.

Source: Eurekalert

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