About 7-day (circaseptan) components, found at different levels of organization, notably in relation to growth, regeneration, repair and development, are often viewed as reflecting no more than the 7-day societal schedule, ample evidence for a built-in feature notwithstanding. Herein, we resolve circaseptans in geomagnetic pulsations recorded by a stand-alone magnetometer residing in Antarctica, far away from societal influences. Human physiological data, collected in the neonatal intensive care unit, show by intra-class correlation analysis that the nonlinearly assessed circaseptan period of heart rate, diastolic blood pressure and body weight is more similar between same-gender twins than among twin pairs, lending additional support for the endogenicity of circaseptans. Like circadians, about-weekly features in environmental variables such as geomagnetic pulsations were genetically acquired in the course of evolution.
Bibliographical noteFunding Information:
U.S. Public Health Service (GM-l 398 1); National Heart, Lung, and Blood Institute, National Institutes of Health (HL-40650), University of Minnesota Supercomputing Institute and Dr. h.c. Dr. h.c. Earl Bakken Fund (FH, GC). Work at Augsburg College was supported by National Science Foundation grant OPP-9725076.
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- Approximate entropy
- Blood pressure
- Geomagnetic pulsations
- Heart rate
- Neonatal twins