Human cardiovascular and vestibular responses in long minutes and low +Gz loading by short arm centrifuge.
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.
Yajima
K
K
Nihon Univ. Sch. of Med., Tokyo, Japan.
Miyamoto
A
A
Ito
M
M
Maru
R
R
Maeda
T
T
Sanada
E
E
Nakazato
T
T
Saiki
C
C
Yamaguchi
Y
Y
Igarashi
M
M
Matsumoto
S
S
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