title: [Changes of cerebral blood flow during diving reactions in humans].
abstract: The characteristics of human cerebral blood flow were estimated during the implementation of the diving response, simulated by complex cold-hypoxic-hypercapnic exposure (CHHE), and under the influence of separate cold, hypercapnic and hypoxic stimuli. Was studied 18 people aged 18-22 years who had no special training. Cerebral blood flow was recorded by transcranial Doppler. It is shown that in the CHHE with the respect initial state to observe a marked increase in cerebral blood flow linear velocity (BFV) to 82.3 ± 15.2%, as well as reducing characterizing the tone of resistance vessels of the brain pulsatility index (PI) to 77.2 ± 13.1%. During cold and tactile stimulation of facial skin BFV and PI did not change significantly, with a single breath hold (Genchi test) BFV increased by 52.3 ± 12.5%, PI at 64.5 ± 15%. The latent period of cerebral blood flow (14-43) allow suppose metabolic (chemical) nature of regulatory influences, which provide changes of considered indicators.
authors: T I
authors: TI
authors: Baranova
authors: D N
authors: DN
authors: Berlov
authors: I N
authors: IN
authors: Ianvareva
mesh_terms: D000293:Adolescent; D001783:Blood Flow Velocity; D001921:Brain / Q000098:blood supply* / Q000503:physiopathology; D004242:Diving / Q000502:physiology*; D006801:Humans; D006935:Hypercapnia / Q000503:physiopathology*; D007035:Hypothermia / Q000503:physiopathology*; D000860:Hypoxia / Q000503:physiopathology*; D008297:Male; D017585:Ultrasonography, Doppler, Transcranial; D014655:Vascular Resistance; D055815:Young Adult