Background: The effects of natural environmental factors upon health, documented in Minnesota, support the proposition of Bratislava's champions of the cosmos and of the biological week, gauged via circaseptan rhythms by the late Ladislav Dérer, whose "macro-rhythm" lasted "most frequently about 6 days".
Main purpose: To introduce 7-day monitoring of blood pressure and heart rate into routine practice. STARTING POINTS AND METHODS: Cosinor analysis on 7-day series determines (conventionally ignored) consistent blood pressure overswinging, i.e., circadian hyper-amplitude-tension (CHAT), a disease risk syndrome, whether it is associated with a normal average blood pressure or a high blood pressure.
Results: Summary of information understandable by the general population on the dynamics of blood pressure. CONCLUSIONS AND MEANING FOR PRACTICE AND THEORY: Space weather reports may prompt preventive measures. Caution dictates in any event monitoring blood pressure and heart rate for 7 days to attempt to prevent strokes, rather than to ignore the greatest yet detectable risk of catastrophic vascular disease, CHAT, a risk greater than old age or high blood pressure. (Tab. 1, Fig. 3, Ref. 31.)