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Iowa State Study Shows Strength Straining Benefits Sleep

Line of Free Weights

Photo: Getty Images

(Ames, IA) -- An Iowa State University study just may motivate more people to hit the weight room, especially if they have trouble sleeping.

Assistant Professor of kinesiology at Iowa State University, Angie Brellenthin says the initial findings of their study suggest resistance exercise may be better than aerobic exercise for getting better sleep. She says participants who completed 60 minutes of resistance exercise, three times a week for a year, slept longer and fell asleep faster than participants who did aerobic-only workouts or a combination of aerobic and resistance exercises for the same amount of time.

Brellenthin presented the findings at the American Heart Association’s Epidemiology, Prevention, Lifestyle & Cardiometabolic Health Conference on March 3.

“Our study shows resistance exercise goes above and beyond the benefits you would see from these other types of exercise in terms of sleep quality,” said Angelique Brellenthin, assistant professor of kinesiology at ISU. “If people are concerned about their sleep and have a limited amount of time to exercise, they may want to consider prioritizing resistance workouts.”

The study included 400-adults who met certain criteria (i.e., being overweight or obese, having elevated blood pressure, not active) were randomly assigned to one of three exercise groups or a non-exercise group.

Participants in the resistance exercise-only group completed 3 sets on 12 machines that targeted all the major muscle groups. Exercises included bicep curls, crunches, leg extensions and triceps dips.

Those in the aerobic exercise-only group walked or jogged on treadmills or opted for elliptical machines or stationary bikes. The machines automatically monitored the participants’ heart rates to ensure they kept a pace in the moderate-to-vigorous intensity zone.

Participants in the combined exercise group completed 30 minutes of cardio, followed by another 30 minutes of resistance training. The participants were then asked about their quality of sleep.

The researchers found more than one-third of all participants reported poor quality sleep at the start of the study.

Among the 42% of participants who were not getting at least 7 hours of sleep at the study’s start, sleep duration increased by an average of 40 minutes in the resistance exercise-only group compared to an average increase of 18 minutes in the other groups, including the group that did not exercise.

People in the resistance exercise-only group also reported falling asleep an average of 3 minutes faster at the end of the 12 months. The researchers found no notable change in the other groups.

Sleep efficiency (i.e., how much time asleep divided by the total time in bed) increased for participants in the resistance exercise and combined exercise groups but not in the aerobic or control groups.

Brellenthin said previous research shows poor sleep quality is strongly associated with high blood pressure, elevated cholesterol and increased risk of heart attacks and strokes.

“While there’s no definitive answer as to why humans sleep, one theory is that sleep provides the body an opportunity to restore different systems,” said Brellenthin. “Because resistance exercise is a powerful stimulus that causes stress to the muscle tissue, that stimulus may send a stronger signal to the brain that this person needs to sleep and to sleep deeply to repair, restore and adapt the muscle tissue for the next time they need it.”

She says other factors include the production of human growth hormones which send signals to the brain. She also says the combination of aerobic exercise and resistance training suggests a positive impact on reducing stress and anxiety, which would also encourage a good night's sleep.


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