Vectorcardiographic Results of Human Exposures to +3GZ, +5GZ, and +7GZ.
Final rept. Aug 75-Dec 79,
SCHOOL OF AEROSPACE MEDICINE BROOKS AFB TX
Pagination or Media Count:
Frank orthogonal vectorcardiograms VCG were recorded from 10 subjects before, during, and for 15 min after exposures to 3Gz 5Gz, and 7Gz. The order of acceleration exposure was randomized, with the individual exposures separated by at least one week. Standard USAF anti-G suits were worn by all subjects. Detailed analysis of the scalar lead electrocardiograms revealed no abnormalities and no consistent signs of conduction disturbances or ischemic ST-T segment changes. During Gz stress, the QRS axis of the VCG demonstrated posterior rotation in the sagittal plan, and counterclock wise rotation in the transverse plane. The changes in the VCGs recorded during Gz stress appeared to be related to rotational changes of the heart due to mechanical stress andor motion within the thorax. There were no ECG or VCG changes indicative of myocardial ischemia andor damage during or after Gz stress. Comprehensive data obtained in this study are presented here. Author
- Stress Physiology