[Changes in heart rate and blood pressure under push pull maneuver simulated on a tilt table].
Objective. Push-pull maneuver (PPM) was simulated using a tilt table to assess detailed cardiovascular responses and the simulation model. Method. Ten healthy fighter pilots were exposed to 3 times transition of body position of head-up tilt (HUT) for 1 min-->head-down tilt (HDT) for 10 s, 15 s and 20 s respectively-->HUT for 1 min in randomized sequences. The rate of tilt table rotation was 45 degrees /s. Heart-level arterial blood pressure was monitored with 4 s intervals, and HR was continuously monitored by ECG. Result. HR and BP fell significantly during HDT compared with those during HUT; upon subsequent HUT, HR and BP were significantly less than those during previous HUT, except BP at 11-15 s. Conclusion. Cardiovascular responses to PPM can be simulated with a tilt table. It is suggested that the tilt table model is valid in simulating the PPM.
Chen
Tong-xin
TX
Clinical Aviation Medicine Center. PLA. General Hospital of Air Force, Beijing, China.
Wang
Ling
L
Sun
Shao-zhi
SZ
Wang
Lu-jin
LJ
Lei
Zhen
Z
Jiang
Shu-qiang
SQ
D000222:Adaptation, Physiological; D000328:Adult; D000337:Aerospace Medicine; D001794:Blood Pressure / Q000502:physiology*; D002681:China; D006112:Gravitation; D018475:Head-Down Tilt; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D018471:Hypergravity; D008889:Military Personnel; D011187:Posture / Q000502:physiology*; D012399:Rotation; D018667:Tilt-Table Test