Use of Lower Body Negative Pressure as a Countermeasure to Negative Gz Acceleration
Final rept. Dec 1987-Dec 1989
WRIGHT STATE UNIV DAYTON OH
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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.
- Medicine and Medical Research