transverse acceleration stress

Transverse acceleration stress refers to the physiological effects on the human body when acceleration is applied perpendicular to the body's long axis. This type of stress is less impactful than positive (head-to-foot) or negative (foot-to-head) acceleration. For instance, during space shuttle launches, which involve significant acceleration, astronauts are positioned on their backs to experience transverse G-forces, tolerating up to 12 g with minimal discomfort. This contrasts with positive or negative acceleration, where even 3-5 g can lead to significant physiological effects like blackout or red-out. Transverse acceleration is defined in physics as the ratio of accelerating force to acceleration when the acceleration is perpendicular to the line of motion.12