N.A. Yarygina - Doctor, Functional Diagnostic Depertment, Northern Medical Clinical Center named after N.A. Semashko (Arkhangelsk).E-mail:yardar@mail.ru L.V. Poskotinova - Dr.Sc. (Biol.), Ph.D. (Med.), Head of Biorhythmology, The Institute of Environmental Physiology, Ural Branch, Russian Academy of Sciences (Arkhangelsk). E-mail:liliya200572@mail.ru E.A. Sosnyna - Doctor, Head of Functional Diagnostic Department, Northern Medical Clinical Center named after N.A. Semashko (Arkhangelsk) O.A. Dudutza - Head Nurse, Functional Diagnostic Department, Northern Medical Clinical Center named after N.A. Semashko (Arkhangelsk) N.A. Zotova - Nurse, Functional Diagnostic Department, Northern Medical Clinical Center named after N.A. Semashko (Arkhangelsk) L.V. Vdovina - Nurse, Functional Diagnostic Department, Northern Medical Clinical Center named after N.A. Semashko (Arkhangelsk) M.M. Korobitzina - Nurse, Functional Diagnostic Department, Northern Medical Clinical Center named after N.A. Semashko (Arkhangelsk)