title: The biological effects of solar activity.
abstract: The synchronization of biological circadian and circannual rhythms is broadly viewed as a result of photic solar effects. Evidence for non-photic solar effects on biota is also slowly being recognized. The ultrastructure of cardiomyocytes from rabbits, the time structure of blood pressure and heart rate of neonates, and the heart rate variability of human adults on earth and in space were examined during magnetically disturbed and quiet days, as were morbidity statistics. Alterations in both the about-daily (circadian) and about-weekly (circaseptan) components are observed during disturbed vs. quite days. The about-weekly period of neonatal blood pressure correlates with that of the local geomagnetic disturbance index K. Circaseptans which are seen early in human life and in various other forms of life, including unicells, may provide information about the possible site(s) of life's origins from an integrative as well as adaptive evolutionary perspective.
authors.affiliation: Space Research Institute, Russian Academy of Sciences, 117 810 Moscow, Profsoyznaha str. 84/32, Russia.
authors.forename: T K
authors.initials: TK
authors.lastname: Breus
authors.forename: K Yu
authors.initials: KY
authors.lastname: Pimenov
authors.forename: G
authors.initials: G
authors.lastname: Cornélissen
authors.forename: E
authors.initials: E
authors.lastname: Halberg
authors.forename: E V
authors.initials: EV
authors.lastname: Syutkina
authors.forename: R M
authors.initials: RM
authors.lastname: Baevsky
authors.forename: V M
authors.initials: VM
authors.lastname: Petrov
authors.forename: K
authors.initials: K
authors.lastname: Orth-Gómer
authors.forename: T
authors.initials: T
authors.lastname: Akerstedt
authors.forename: K
authors.initials: K
authors.lastname: Otsuka
authors.forename: Y
authors.initials: Y
authors.lastname: Watanabe
authors.forename: S M
authors.initials: SM
authors.lastname: Chibisov
mesh_terms: D000818:Animals; D002318:Cardiovascular Diseases / Q000401:mortality / Q000503:physiopathology; D004574:Electromagnetic Fields / Q000009:adverse effects; D006439:Hemodynamics / Q000502:physiology; D006801:Humans; D008297:Male; D032383:Myocytes, Cardiac / Q000502:physiology / Q000648:ultrastructure; D010507:Periodicity; D011817:Rabbits; D019445:Solar Activity; D013026:Space Flight / Q000706:statistics & numerical data