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We examined the effects of aerobic fitness and race on the diurnal rhythm of blood pressure of 175 healthy adolescents who performed a cycle ergometer maximal exercise test while oxygen consumption was measured. A median split of maximum oxygen consumption for boys and girls separately classified them as either "more-fit" or "less-fit" subjects. Ambulatory blood pressure recordings were also performed, and the data were analyzed for means while subjects were awake and asleep. Less-fit black boys had higher systolic pressures than more-fit black boys while awake (124 vs. 115 mm Hg; p less than 0.009) and asleep (117 vs. 108; p less than 0.001). Less-fit black boys also had higher systolic pressures than less-fit white boys while awake (114; p less than 0.002) and asleep (105; p less than 0.001), and they had higher systolic pressures than more-fit white boys while asleep (105; p less than 0.01). Less-fit black girls had higher systolic pressures than more-fit black girls while awake (116 vs. 109; p less than 0.004) and asleep (109 vs. 100; p less than 0.001). Less-fit black girls also had higher diastolic pressures than more-fit black girls while awake (71 vs. 66; p less than 0.002) and asleep (66 vs. 61; p less than 0.001).(ABSTRACT TRUNCATED AT 250 WORDS)

Aerobic fitness and the diurnal rhythm of blood pressure in adolescents.