positive acceleration stress

Positive acceleration stress refers to physiological changes in the human body when its speed rapidly increases, specifically when the acceleration is directed from head to foot. This is often experienced by pilots and is measured in units of gravitational acceleration (g).12

As acceleration increases, individuals feel a general heaviness, and movement becomes difficult. Internal organs are pulled downward, leading to a drop in blood pressure and potential vision impairment, including blackout. In severe cases, unconsciousness can occur. While these effects can cause temporary confusion or discomfort, they typically have no permanent aftereffects.1