Poor sleep equals high blood pressure for teens

WASHINGTON (Reuters) - Poor sleep habits can do more than annoy parents and make teenagers drowsy in school -- they can lead to high blood pressure, U.S. researchers reported on Monday.

Teens who slept fewer than 6 1/2 hours a night had more than twice the risk of high blood pressure and those with troubled sleep had more than triple the risk, the team at Case Western Reserve University in Cleveland, Ohio found.

Writing in the American Heart Association journal Circulation, the researchers found the pattern held even when adjusted for sex, weight and socioeconomic status.

"Our study underscores the high rate of poor quality and inadequate sleep in adolescence coupled with the risk of developing high blood pressure and other health problems," said Dr. Susan Redline, the pediatrician who led the study.

"We also found that a low sleep efficiency may be more consistently associated with pre-hypertension than a shorter sleep period."

High blood pressure can damage arteries and kidneys, causing stroke, kidney disease and other illnesses.

Redline's team studied 238 13-to-16-year-olds and found 14 percent of the adolescents had high blood pressure or readings at the borderline, called pre-hypertension.

For adults, high blood pressure is defined as a reading of 140/90 or above, but for children it is defined as being in the 90th percentile for their age.

They had the volunteers fill out sleep diaries but also measured their movements while in bed to gauge whether they were really asleep. On average, the teens got just 7.7 hours of sleep a night, while they need nine hours at that age.