title: Circadian systolic and diastolic differences (CSDD) and circadian modulation of 1.7-h ultradians.
abstract: In 24-h ambulatory blood pressure profiles there is overlap between the lowest systolic and the highest diastolic pressure in over 90% of the cases. An overlap is observed in about 75% of the cases when considering 90% ranges. The prominence of the 1.7-h ultradian component varies as a function of circadian stage and is found to be most prominent around mid-sleep.
mesh_terms: D000204:Activity Cycles; D002940:Circadian Rhythm; D003971:Diastole; D005260:Female; D006801:Humans; D008297:Male; D009200:Myocardial Contraction; D012016:Reference Values; D013599:Systole