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Friday, September 7, 2012

The Benefits of Middle-Age Fitness


By Gretchen Reynolds, NY Times, September 5, 2012
Americans are living longer, with our average life expectancy now surpassing 78 years, up from less than 74 years in 1980. But we are not necessarily living better. The incidence of a variety of chronic diseases, like diabetes, cancer and heart disease, has also been growing dramatically, particularly among people who are not yet elderly.

The convergence of those two developments has led to what some researchers have identified as a “lengthening of morbidity.” That means we are spending more years living with chronic disease and ill health—not the outcome that most of us would hope for from a prolonged life span.

But a notable new study published last week in Archives of Internal Medicine suggests that a little advance planning could change that prospect. Being or becoming fit in middle age, the study found, even if you haven’t previously bothered with exercise, appears to reshape the landscape of aging.

For the study, researchers at the University of Texas Southwestern Medical Center and the Cooper Institute in Dallas gathered medical records for 18,670 middle-aged men and women who’d visited the Cooper Clinic (the medical arm of the Cooper Institute) for a checkup beginning in 1970.

The 18,670 men and women, with an average age of 49, were healthy and free of chronic diseases at their first checkup, when they all took a treadmill test to determine their aerobic fitness. Based on the results of this initial fitness test, the researchers divided the group into five fitness categories, with the bulk of the people residing, like most Americans, in the least-fit section.

Then, in a first-of-its-kind data comparison, the researchers checked the same individuals’ Medicare claim records (with permission) from 1999 through 2009, by which time most of the participants were in their 70s or 80s.

What they found was that those adults who had been the least fit at the time of their middle-age checkup also were the most likely to have developed any of eight serious or chronic conditions early in the aging process. These include heart disease, diabetes, Alzheimer’s, and colon or lung cancer.

The adults who’d been the most fit in their 40s and 50s often developed many of the same conditions, but notably their maladies appeared significantly later in life than for the less fit.

While this finding might not seem, on its face, altogether positive, the results should be viewed as encouraging, says Dr. Benjamin Willis, a staff epidemiologist at the Cooper Institute who led the study. “I’m 58, and for me, the results were a big relief,” Dr. Willis said.

That’s because, he points out, the results show, in essence, that being physically fit “compresses the time” that someone is likely to spend being debilitated during old age, leaving the earlier post-retirement years free of serious illness and, at least potentially, imbued with a finer quality of life.

Of course, aging is a complicated process and extremely individualized, with the onset or absence of illness representing only one element in quality of life after age 65 or so. But it is a big element, says Dr. Jarett Berry, an assistant professor of internal medicine at U.T. Southwestern and an author of the study. “And since it appears to be associated with midlife fitness, it is amenable to change,” he continues.

So, exercising during midlife, especially if you haven’t been, can pay enormous later-life benefits, Dr. Berry says. And moving out of the least-fit category requires, he says, “only a small dose of exercise,” like 20 or 30 minutes of walking on most days of the week.

“You don’t have to become an athlete,” says Dr. Willis, who himself has little time for exercise but tries to fit in a daily walk. “Just getting up off the couch is key.”

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