Continued or heavy g-force will rapidly progress to g-LOC (g-force induced Loss of Consciousness). Untrained individuals can withstand approximately 4g, while fighter pilots with g-suits are trained to perform 9g maneuvers.
In situations involving continued or heavy g-forces, individuals without training may experience g-LOC within a short period of time (about 4g). In contrast, highly trained fighter pilots equipped with specialized gear (g-suits) are able to withstand and even perform more extreme 9g maneuvers.