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 Mind/Body Medicine: Exercise Improves Sleep 
Findings from a recent Stanford University Medical School study may come as no surprise: older and middle-age people reported sleeping better when they added regular exercise to their routine. After 16 weeks in a moderate intensity exercise program, subjects were able to fall asleep about 15 minutes earlier and sleep about 45 minutes longer at night.

Researchers selected 29 women and 14 men with mild sleep complaints for a 16-week controlled study. All participants were age 50 to 74, lived sedentary lives, and suffered no cardiovascular disease, stroke or other clinically diagnosed disorder known to cause sleep disorders. All were non-smokers and moderate drinkers. None were seriously overweight or taking hormone replacement therapy, sleep medications or other medications known to affect sleep.

Participants exercised at least four times a week. Twice a week they participated in an organized aerobics class, which included 30 minutes of endurance training. The other two times they exercised on their own, doing 40 minutes of brisk walking or stationary bike riding. To assess impact on sleep, researchers looked at factors such as how long it takes to fall asleep, total hours of sleep per night, how often one wakes up, how one feels when waking up, and daytime function.

The link between aerobic exercise and sleep may seem obvious, but until this study, there has been very little controlled research to support this "conventional wisdom." Researchers were especially concerned about the overemphasis on sedative hypnotic medications for older adults. Though they are only 20% of the population, older Americans receive almost half the medications prescribed to aid sleep. The potential side effects of these drugs-confusion, falls, extended drowsiness, agitation, and interactions with other medications-can be especially problematic for this age group. Until this study, there have been very few attempts to identify effective non-drug approaches to treating mild sleep disorders.

The study also provides further evidence of the interactions of mind and body. In this case improving physical health shows a positive impact on the mind.

RX: Self-Care Tips
Try exercise to help your sleep. Here are some tips.

  • A drop in body temperature aids sound sleep. So time your exercise five to six hours before bedtime.
  • Make your exercise vigorous enough to make you sweat a little. Previous studies have shown that non-aerobic stretching and concentration exercises alone did not impart sleep.
  • Stick with it! Participants in this study did not report improved sleep until they had been exercising for 16 weeks.

Excerpted with permission from the Quarterly Newsletter, Mind/Body Health Newsletter. For subscription information call 1-(800)-222-4745 or visit the Institute for the Study of Human Knowledge website.

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 About The Author
David Sobel MDDavid S. Sobel, M.D., M.P.H., is a practicing physician in adult medicine and Medical Director of Patient Education and Health Promotion for Kaiser Permanente Northern California. He is physician lead for the......more
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