Which type of G force is considered best tolerated?

The best-tolerated type of G force is anteroposterior, which refers to the forces experienced along the front and back axis of the body. This arrangement is significant because the human body is generally more resilient to forces acting in this direction.

When subjected to anteroposterior G forces, such as during acceleration or deceleration in a vehicle, the effects on an individual's cardiovascular and respiratory functions are less severe compared to the other orientations. These G forces allow for better blood flow and oxygenation to the vital organs as the body is capable of more effectively managing the pressure changes without leading to rapid incapacitation or injury.

In contrast, vertical G forces can lead to serious issues such as G-induced Loss Of Consciousness (GLOC) due to blood pooling in the lower extremities under high gravitational forces, impeding blood flow to the brain. Laterally applied forces can also exert significant strain on the body, affecting balance and potentially causing injuries due to the abrupt change in direction.

The human body's anatomical structure and physiological responses make anteroposterior G forces more manageable, thereby making this orientation the most tolerated among the various types of G forces encountered.