[Comparative characteristics of the gas-exchange parameters during exposure to lateral (Gy), longitudinal (Gz) and latero-longitudinal (Gz/Gy) G-loads]

Subject of the investigation was dynamics of gas-exchange parameters during exposure to lateral and laterolongitudinal g-loads (Gy, Gz, Gz/Gy) in a coach inclined at 300 from the horizontal with a rigid restraint system. Gy values varied between 0.5 and 5.0 units, Gz - between 3.0 and 9.9 units and Gz/Gy - between 2.6/1.8 and 5.0/3.0 units. In all instances, growth gradient of the radial loads was 1.0 u/s, and a period of exposure was up to 30 s. Comparison of the Gz vs. Gy tolerance revealed as a substantial increase of the physiological "cost", so a more visible disbalance of the diffusion/perfusion ratio of the lung. This is consistent with the gas-exchange data according to which lateral g-loads are a stronger stress-factor and more challenging for pilots than the longitudinal g-loads.

PMID: 16447947 [PubMed - indexed for MEDLINE]