Final answer:
Workers who suspend any full body harness often lose consciousness after a fall due to the force exerted on their bodies and potential head injuries.
Step-by-step explanation:
When workers who suspend any full body harness fall, they may lose consciousness due to a combination of factors. The sudden stop after a fall can result in a large net force acting on the body, leading to pressure on vital organs and blood vessels. This can cause a decrease in blood flow to the brain, resulting in loss of consciousness. Additionally, the impact of the fall can cause trauma to the head, leading to a concussion or other head injuries that can also result in loss of consciousness.