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Gene Decides How Much Exercise In Needed For The Elderly People

Research suggests that the reason why elderly population differs in their ability to exercise for better physical ability may be genetical by //nature.

Researchers found that an enzyme involved in blood pressure regulation may also influence how the body responds to exercise. The findings, by researchers at Wake Forest University School of Medicine and colleagues, are reported today in the Journal of the American Medical Association.

The study is the first to show that a gene that controls levels of angiotensin converting enzyme (ACE) in the body may be associated with physical function in older adults. The researchers found that older exercisers who inherited a gene combination associated with the lowest ACE production were 45 percent more likely to develop difficulties with climbing stairs or walking a quarter-mile than exercisers with gene combinations associated with higher levels of ACE.

ACE genotype seems to be associated with how well activity helps preserve. This finding may offer new opportunities to explore treatments to help older adults maintain their function.

The results are from the ongoing Health Aging and Body Composition Cohort Study, conducted in the metropolitan areas of Memphis, Tenn., and Pittsburgh, Pa. The study involves 3,075 well-functioning, community-dwelling adults ages 70 through 79. Participants were enrolled in 1997 and 1998.

The current data are from 2,966 participants who were followed for up to 4.1 years. About a third (31.3 percent) of the group was active, burning more than 1,000 calories a week in exercise; the others were inactive. The researchers found that the exercisers were significantly less likely (33 percent) to report mobility problems than the non-exercisers.

More than a third of adults in the USA in the age group of 70 and older report having difficulty walking a quarter-mile or climbing 10 stairs. Previous research has shown that these mobility diffi culties often proceed to physical disability. Older adults reporting these difficulties are at four times the risk of entering a nursing home and three times the risk of dying over a two-year period compared with those reporting no difficulty.

The same ACE gene combination associated with better function in exercising older adults has been associated with superior muscle strength and power in young elite athletes. The current study was designed to test whether ACE production also affects physical function in older exercisers.

The gene that controls ACE production can be inherited in three different combinations. Only about 19 percent of study participants had the combination associated with lower ACE production and did not benefit as much from exercise as others. However, they still did better than those who didn’t exercise.

Source: Newswise
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