THAY ĐỔI MỘT SỐ CHỈ SỐ SIÊU ÂM DOPPLER ĐỘNG MẠCH Ở HỌC VIÊN PHI CÔNG QUÂN SỰ KHI LUYỆN TẬP TRÊN MÁY MÔ PHỎNG QUÁ TẢI BAY STATOERGOMETR

Abstract

Objectives: Evaluate the kinematics of some Doppler ultrasound indicators of the lower limb and cerebral arteries with the test of tolerance to G-force and after training course on statoergometr. Methods: Analyze changes of peak systolic velocity (Vps) and resistive index (RI) by using Doppler ultrasound of the right superficial femoral artery, right popliteal artery, and left common carotid artery of military pilot cadets when tested on the G-force simulator statoergometr. Results: Lower limb static muscle tension when performing the 5-level statoergometric test led to spasm of the lower limb arteries at various levels. In the superficial femoral artery, the Vps index decreased and RI increased (p<0,01), in the popliteal artery Vps decreased (p<0,05) and RI remained unchanged. For the common carotid artery, Vps and RI decreased (p<0,01). The difference in the Vps and RI indicators between Vietnamese and Russian military pilot cadets when testing the ability to anti-G is not statistically significant. After the training course, the lower limb pulse Vps indices decreased (p<0,05) during maximum exertion. Conclusion: When performing the test on the statoergometer, lower limb muscle contraction occurred, leading to a restriction of blood flow to the limbs and pushing more blood volume to the brain, helping to reduce the risk of loss of consciousness when experiencing head-pelvic overload G+.