Suspension trauma safety straps, one pair, attaches to most harnesses. The Suspension Trauma Safety Strap was designed to help a worker overcome the potential negative health impacts of suspension trauma (otherwise known as Orthostatic Intolerance).
Suspension trauma, also known as harness hang syndrome, suspension syndrome, or orthostatic intolerance, is an effect which occurs when the human body is held upright without any movement for a period of time. If the person is strapped into a harness or tied to an upright object they will eventually suffer the central ischaemic response. Fainting while remaining vertical increases the risk of death from cerebral hypoxia. Since there is no evidence that these effects are specifically due to trauma, or caused by the harness itself, climbing medicine authorities have argued against the terminology of suspension trauma or harness hang syndrome and instead termed this simply “suspension syndrome”.
Another personal self-rescue option that should be a consideration in any rescue plan is a suspension trauma strap system. These lightweight systems mount onto the side straps of the operator’s harness. In the case of fall or ejection from the platform, the operator opens the case to release the straps, connects them at the proper length, and steps into the loop created by the straps
This allows the operator to stand up in their harness and relieve the pressure being applied to the arteries and veins around the top of the legs until they can be rescued.