title: Human cardiovascular and vestibular responses in long minutes and low +Gz loading by short arm centrifuge.
abstract: 1.4 G, 1.7 G, and 2.0 G of +Gz and 60 minutes centrifugation was adopted to 20 healthy male subjects using 1.8 m radius centrifuge equipped to Nihon University School of Medicine.  G was applied from lower G, considering G training effect for the subjects.   Effects on performance decline and side effects of such a short-arm centrifugation were especially observed in the experiments, because this size of centrifuge could be used in space station in future for a strong countermeasure of cardiovascular deconditioning, demineralization from bone, etc.   G training effect was observed same as higher and rapid G acceleration in fighter pilot.   Subjects suffered from many types of discomfort; such as sensation of heaviness of diaphragm, cold sweat, nausea, irritable feeling, arrhythmia, tachycardia, rapid decrease of blood pressure, which sometimes caused interruption of G load.  As 2.0 G and 60 minutes centrifugation seemed very tough load to the subjects, there should be necessary some G suit or other countermeasure, if we apply a higher G and/or longer G duration.  Performance decline due to the load commonly continued for 1 hour or so.  Side effects were observed in relation to neuro-vestibular, cardio-vascular, and autonomic nervous system.
authors.affiliation: Nihon Univ. Sch. of Med., Tokyo, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Yajima
authors.forename: A
authors.initials: A
authors.lastname: Miyamoto
authors.forename: M
authors.initials: M
authors.lastname: Ito
authors.forename: R
authors.initials: R
authors.lastname: Maru
authors.forename: T
authors.initials: T
authors.lastname: Maeda
authors.forename: E
authors.initials: E
authors.lastname: Sanada
authors.forename: T
authors.initials: T
authors.lastname: Nakazato
authors.forename: C
authors.initials: C
authors.lastname: Saiki
authors.forename: Y
authors.initials: Y
authors.lastname: Yamaguchi
authors.forename: M
authors.initials: M
authors.lastname: Igarashi
authors.forename: S
authors.initials: S
authors.lastname: Matsumoto
mesh_terms: D000328:Adult; D000337:Aerospace Medicine; D001794:Blood Pressure / Q000502:physiology*; D018493:Cardiovascular Deconditioning; D002498:Centrifugation / Q000009:adverse effects* / Q000295:instrumentation; D005425:Flicker Fusion / Q000502:physiology; D018470:Gravity, Altered / Q000009:adverse effects*; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D018471:Hypergravity / Q000009:adverse effects*; D008297:Male; D008875:Middle Aged; D004856:Postural Balance / Q000502:physiology; D013997:Time Factors; D014722:Vestibule, Labyrinth / Q000502:physiology*; D018544:Weightlessness Countermeasures