Use of Lower Body Negative Pressure as a Countermeasure to Negative Gz Acceleration

Lower body negative pressure (LBNP) was used at levels of 0, -50, and -100 torr as a countermeasure prior to centrifuge exposures of subjects to negative Gz at levels of -1.0, -1.5, and -2.0. EKG, echocardiographic, and subjective data were gathered. Physiological variables for end diastolic volume...

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Bibliographic Details
Main Authors: Beck, Bradley G, Tripp, Jr, Lloyd D
Format: Report
Language:English
Subjects:
ACCELERATION
BASE LINES
COUNTERMEASURES
ELECTROCARDIOGRAPHY
HEART
HEART RATE
HYDROSTATIC PRESSURE
LOW PRESSURE
Medicine and Medical Research
OUTPUT
PE62202F
PHYSIOLOGICAL EFFECTS
VALUE
VARIABLES
VOLUME
WEIGHTLESSNESS
WUAAMRL72313502
Online Access:Request full text
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Summary:Lower body negative pressure (LBNP) was used at levels of 0, -50, and -100 torr as a countermeasure prior to centrifuge exposures of subjects to negative Gz at levels of -1.0, -1.5, and -2.0. EKG, echocardiographic, and subjective data were gathered. Physiological variables for end diastolic volume (EDV), end systolic volume (ESV), stroke volume (SV), heart rate (HR), and cardiac output (CO) were obtained at baseline values, then percent of baseline after LBNP was started, then during the -Gz exposure plateau. ANOVA revealed that the LBNP main effects were significant for EDV, ESV, SV, and HR. The negative Gz main effects were not significant for EDV, ESV, & SV but were significant for HR and CO.