title: Measurement of human blood viscosity by an electromagnetic spinning sphere viscometer.
abstract: We herein applied an electromagnetic spinning sphere (EMS) viscometer to the measurement of human blood viscosity for the first time. We collected blood samples from 100 healthy outpatient volunteers in order to analyse viscosity dependence on blood cell parameters and on the shear rate with a simple approximation formula [ηi (γ)\, = Ai γ(- pi) + η0]. Viscosity dependence on blood cell parameters was relatively high at a high shear rate, but became lower as the shear rate decreased. The approximation formula with appropriate parameters of Ai and pi nearly faithfully reproduced actual blood rheological behaviour with a standard deviation of 1.5%. The distributions of Ai and pi values were broad, suggesting that the pattern of viscosity dependence on the shear rate varied with individual differences. The results obtained using the EMS viscometer suggest that blood viscosity values are individual-specific and actual individual measurements are important for understanding rheological conditions.
authors.affiliation: a Department of Neurosurgery , Hokkaido University Graduate School of Medicine , Sapporo , Japan ;
authors.forename: Koji
authors.initials: K
authors.lastname: Furukawa
authors.affiliation: a Department of Neurosurgery , Hokkaido University Graduate School of Medicine , Sapporo , Japan ;
authors.forename: Takeo
authors.initials: T
authors.lastname: Abumiya
authors.affiliation: b Department of Fundamental Engineering , Institute of Industrial Science, University of Tokyo , Tokyo , Japan ;
authors.forename: Keiji
authors.initials: K
authors.lastname: Sakai
authors.affiliation: b Department of Fundamental Engineering , Institute of Industrial Science, University of Tokyo , Tokyo , Japan ;
authors.forename: Miki
authors.initials: M
authors.lastname: Hirano
authors.affiliation: a Department of Neurosurgery , Hokkaido University Graduate School of Medicine , Sapporo , Japan ;
authors.forename: Toshiya
authors.initials: T
authors.lastname: Osanai
authors.affiliation: a Department of Neurosurgery , Hokkaido University Graduate School of Medicine , Sapporo , Japan ;
authors.forename: Hideo
authors.initials: H
authors.lastname: Shichinohe
authors.affiliation: a Department of Neurosurgery , Hokkaido University Graduate School of Medicine , Sapporo , Japan ;
authors.forename: Naoki
authors.initials: N
authors.lastname: Nakayama
authors.affiliation: a Department of Neurosurgery , Hokkaido University Graduate School of Medicine , Sapporo , Japan ;
authors.forename: Ken
authors.initials: K
authors.lastname: Kazumata
authors.affiliation: c Hokkaido Neurosurgical Memorial Hospital , Sapporo , Japan.
authors.forename: Toshimitsu
authors.initials: T
authors.lastname: Aida
authors.affiliation: a Department of Neurosurgery , Hokkaido University Graduate School of Medicine , Sapporo , Japan ;
authors.forename: Kiyohiro
authors.initials: K
authors.lastname: Houkin
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001772:Blood Cell Count; D001809:Blood Viscosity / Q000502:physiology*; D055590:Electromagnetic Phenomena; D005260:Female; D006403:Hematologic Tests / Q000379:methods*; D006801:Humans; D008297:Male; D008875:Middle Aged; D055815:Young Adult
keywords: Blood viscosity; blood cells; rheology; shear rate