Rapid communication: PDF OnlyTwenty-four-hour blood pressure is not dependent on endogenous circadian rhythmBaumgart, Peter*; Walger, Peter*; Fuchs, Gabriele*; Dorst, Karl G.*; Vettert, Hans; Rahn, Karl H.* Author Information *Medizinische Poliklinik, University of Münster, Federal Republic of Germany. †Medizinische Poliklinik, University of Bonn, Federal Republic of Germany. Journal of Hypertension 7(4):p 331-334, April 1989. Buy Abstract The effects of shifted working and sleeping phases on the diurnal blood pressure rhythm were investigated in 15 physically working industrial shift workers at a slowly rotated three-shift system. Ambulatory 24-h blood pressure monitoring was performed during the morning and night shifts. In the two shifts the mean 24-h blood pressure was identical. There were no differences in the blood pressure levels in the sleeping phases or in the working periods between the two 24-h cycles. Diurnal blood pressure fluctuations had equal amplitudes. Corresponding to the lag between the working period there was a phase difference of 8h between the 24-h blood pressure curves. At this lag, there was a high correlation between the mean hourly blood pressure values (r = 0.683). Twenty-four-hour blood pressure curves during the first and last day of a night shift were nearly equal. Thus the effects of shift rotation on the 24-h blood pressure profile were fully expressed within the first 24 hours. The immediate and complete adaptation of the 24-h blood pressure curve to shifted activity and sleeping phases indicates that activity determines the diurnal blood pressure profile. The blood pressure is largely independent of internal circadian rhythm. © Lippincott-Raven Publishers.