If the legs are immobile, then these "muscle pumps" do not operate effectively, and blood can accumulate. In the veins, blood normally is moved back to the heart through one-way valves using the normal muscular action associated with limb movement. Orthostatic intolerance may be defined as "the development of symptoms such as light-headedness, palpitations, tremulousness, poor concentration, fatigue, nausea, dizziness, headache, sweating, weakness and occasionally fainting during upright standing." While in a sedentary position, blood can accumulate in the veins, which is commonly called "venous pooling," and cause orthostatic intolerance.
Suspension trauma is also referred to as orthostatic intolerance. High-angle rescue: How to execute a mid-height pick off
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