title: [The duration of the aftereffects of UV-irradiation of man in conditions of UV-insufficiency].
abstract: The purpose of the present investigation was to study the aftereffect of UV-B-irradiation applied during 10 or 20 sessions. The biological effect and aftereffect duration of UV-B-irradiation of the upper body of 9 healthy volunteers (residents of the city of Moscow and its suburbs) were evaluated in autumn and winter. During UV-irradiation in the range 220-280, 280-320, or 320-400 nm the flux density was 0.035, 1.75, or 0.65 W/m2, respectively. Group 1 subjects (5 men) were exposed to UV-B-irradiation 10 times (once with 0.5, 0.6, 0.75, 0.9, 1.1, 1.35, 1.65 MED and three times with 2.0 MED) and Group 2 subjects (4 men) were exposed to UV-B-irradiation 20 times (twice with 0.5, 0.75, 1.0, 1.25, 1.5, 1.75 MED and eight times with 2 MED). The sessions were arranged every other day. The exposure produced a beneficial effect on the human body: skin sensitivity decreased, resistance of skin capillaries increased, Ca metabolism normalized, blood 25 (OH) D grew. The trend of responses was similar after 10 and 20 sessions; however, 20 sessions caused a longer-term aftereffect. In relation to space programs, it is concluded that UV-irradiation can be applied on the ground before short-term flights (less than 4 months) and in space during longer-term flights (greater than 4 months).
authors.forename: N E
authors.initials: NE
authors.lastname: Panferova
authors.forename: V I
authors.initials: VI
authors.lastname: Pervushin
authors.forename: V I
authors.initials: VI
authors.lastname: Lebedev
authors.forename: M S
authors.initials: MS
authors.lastname: Belakovskiĭ
authors.forename: M S
authors.initials: MS
authors.lastname: Khaĭdakov
authors.forename: L V
authors.initials: LV
authors.lastname: Gutorova
authors.forename: T A
authors.initials: TA
authors.lastname: Kabasheva
authors.forename: Iu N
authors.initials: IuN
authors.lastname: Khodkevich
authors.forename: M P
authors.initials: MP
authors.lastname: Rykova
mesh_terms: D002118:Calcium / Q000378:metabolism; D006801:Humans; D006887:Hydroxycholecalciferols / Q000097:blood; D007694:Killer Cells, Natural / Q000502:physiology; D008297:Male; D012621:Seasons; D013026:Space Flight; D013997:Time Factors; D014467:Ultraviolet Therapy
chemical_list: D006887:Hydroxycholecalciferols; D002118:Calcium
vernacular_title: O dlitel'nosti posledeĭstviia UF-oblucheniia cheloveka v usloviiakh UF-nedostatochnosti.