It's
something we've all heard for years: Exercise can help keep older adults
healthy. But now a study, the first of its kind to look at frail, older adults,
proves that physical activity can help these people maintain their mobility and
dodge physical disability.
A
new University of Florida study shows daily moderate physical activity may mean
the difference between seniors being able to keep up everyday activities or
becoming housebound. In fact, moderate physical activity helped aging adults
maintain their ability to walk at a rate 18 percent higher than older adults
who did not exercise. "The very purpose of the study is to provide
definitive evidence that physical activity can truly improve the independence
of older adults," said principal investigator Marco Pahor, Ph.D., director
of the UF's Institute on Aging.
What's
more, moderate physical activity not only helped older adults maintain mobility
but also helped prevent the occurrence of long-term mobility loss. Co-principal
investigator Jack Guralnik, Ph.D., a professor of epidemiology and public
health at the University of Maryland School of Medicine, said there was a 28 percent
reduction in people permanently losing the ability to walk easily.
"The
fact that we had an even bigger impact on persistent disability is very
good," said Guralnik, who also holds a faculty position at UF. "It
implies that a greater percentage of the adults who had physical activity
intervention recovered when they did develop mobility disability."
The
results will be published in the May 2014 issue of the Journal of the
American Medical Association.
Researchers
showed that prescribed daily physical activity can prevent older adults' loss
of mobility, defined in the study as the ability to walk 400 meters, or about a
quarter of a mile. Although 400 meters might sound like an arbitrary number,
it's an important figure for older adults, researchers said.
"Four
hundred meters is once around the track, or from the parking lot to the store,
or two or three blocks around your neighborhood," Guralnik said.
"It's an important distance in maintaining an independent life."
Called
the Lifestyle Interventions and Independence for Elders, or LIFE, study, the
study took place across eight field centers. There were two Florida field
center recruitment sites at the University of Florida and Jacksonville Brooks
Rehabilitation as well as field centers at Northwestern University, Pennington
Biomedical Research Center, the University of Pittsburgh, Stanford University,
Tufts University, Wake Forest School of Medicine and Yale University.
The
researchers recruited 1,635 sedentary men and women ages 70 to 89 for the
study. The participants could walk a quarter mile within 15 minutes but were at
risk of losing that ability. Low physical performance can be a predictor of
early death and higher hospitalization and institutionalization rates, and
patients with low physical performance are not often recruited to large
studies, Pahor said.
"These
are people who are patients we see every day. This is why this study is so
important: It includes a population that is typically understudied," Pahor
said.
The
participants were randomly separated into two groups and followed for an
average of 2.6 years. The first group of 818 walked 150 minutes per week and
did strength, flexibility and balance training. They were monitored by two
visits to field centers per week. The second group of 817 attended health
education classes and performed stretching exercises. This phase of the study
occurred between February 2010 and December 2013.
Staff
members assessed study participants every six months, checking their ability to
walk, their body weight, blood pressure and pulse rate, among other
measurements. The staff was not told which participants were assigned to
physical activity or to the education classes.
The
study did turn up one unanticipated result: The number of people reporting
hospitalizations in the physical activity group was slightly higher than in the
education group, though the number was not statistically significant. The
researchers think this is in part because the physical activity group had more
frequent contact with research staff, possibly resulting in a higher reporting
of hospitalizations. The physical activity could also have triggered underlying
heart trouble and other health problems. Researchers plan to study this
occurrence more closely, Pahor said.
"It's
quite a vulnerable and high-risk population," Pahor said. "Both age
and poor health were factors. We selected people who had low physical
performance, which is a strong predictor for future morbidity, hospitalization,
institutionalization and mortality."
Wendy
Kohrt, Ph.D., professor of medicine in the division of geriatric medicine at
the University of Colorado, helped review the scientific merit of the study
before the launch of the main LIFE trial. She said the information produced by
this study fills gaps in researchers' knowledge of the types of people enrolled
in the study.
"As
an exercise scientist, I believe this type of research is absolutely critical
to establish scientific evidence on which to make recommendations for how
lifestyle can beneficially influence health status," Kohrt said.
"There is a general belief among the public and the scientific and medical
communities that we know exercise is good for you, so why do we need to do more
research in this area? However, we still do not know whether certain types or
doses of exercise are better than others, particularly for specific health
conditions or diseases. The LIFE trial demonstrated that a modest increase in
physical activity has the potential to help older adults maintain functional
independence."
Pahor and Guralnik said there is still a
vast amount of data to unpack from the study, including looking at the effects
of physical activity on the participants' emotional well-being. The research
team also plans to determine how physical activity impacted the participants'
physiological, social and biological factors.
No comments:
Post a Comment