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Distribution of internal and external cranial blood flows during whole body heating
Author(s) -
Shibasaki Manabu,
Sato Kohei,
Okazaki Kazunobu,
Miyamoto Tadayoshi,
Hirasawa Ai,
Ogoh Shigehiko
Publication year - 2013
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.27.1_supplement.1203.5
Subject(s) - blood flow , supine position , internal carotid artery , medicine , cerebral blood flow , hemodynamics , external carotid artery , heat stress , cardiology , anesthesia , zoology , biology
In hyperthermic condition, cerebral blood flow decreases while cardiac output is increased. Recently we observed the altered distribution of internal and external cranial blood flows during dynamic exercise; external carotid artery (ECA) and vertebral artery (VA) blood flows increased proportionally with workload although internal carotid artery (ICA) blood flow increased during light and mild exercises but decreased during intense exercise. The increased body temperature might modulate distribution of these blood flows. To test this hypothesis, we assessed the distribution of these blood flows during a passive heat stress. Twelve young healthy subjects dressed tube‐lined suit and rested in a supine position. ICA, ECA and VA blood flows were measured by ultrasonography. Esophageal temperature (Tes) was increased by circulating hot water through the suit. Tes was increased from 37.0±0.3 °C to 38.5±0.3 °C during whole body heating. The heat stress increased ECA blood flow from 179±76 to 409±193 ml/min, while ICA and VA blood flows decresaed from 293±63 to 235±59 ml/min and from 91±37 to 82±35 ml/min, respectively. During heat stress, ECA and VA blood flows gradually increased and decreased, respectively. Interestingly, ICA blood flow did not change until Tes was elevated by ~1 °C, then significantly decreased at the end of heat stress.