BackgroundThis study was undertaken to assess whether ambulatory blood pressure (BP) in a population of stage I hypertensive individuals was lower in the subjects performing regular exercise training.Methods and ResultsThe study was carried out in 796 young hypertensive patients (592 men) who had never been treated who took part in the HARVEST trial. The diagnosis of stage I hypertension was made on the basis of six office BP measurements. Subjects underwent noninvasive 24-hour ambulatory BP monitoring, 24-hour urine collection for catecholamine assessment, and echocardiography (n = 457). They were classified as exercisers if they reported at least one session of aerobic sports per week and as nonexercisers if they did not engage regularly in sports activities. Age (P< .0001), body mass index (P= .002), 24-hour heart rate (P< .0001), alcohol intake (P= .02), smoking (P= .02), and norepinephrine output (P= .04) were lower in the active (n = 153) than the inactive (n = 439) men. Physically active men exhibited a lower 24-hour and daytime diastolic BP than the inactive men, while there were no group differences in office BP or in nighttime diastolic BP and in ambulatory systolic BP. The between-group ambulatory diastolic BP difference remained statistically significant after adjustment for age, body mass index, alcohol intake, and smoking (P< .0001). Of the nonexercisers, 46.2% were confirmed hypertensives, compared with only 26.8% of the exercisers (P< .0001), on the basis of daytime diastolic BP. Echocardiographic left ventricular dimensional and functional indexes were similar in the two groups of men. Similar findings were shown by the 16 women who engaged in aerobic sports.ConclusionsThese data suggest that participation in aerobic sports may attenuate the risk of hypertension in young subjects whose office BP is in the stage I hypertensive range at office measurement.