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The Circulatory System
An expanding body of research exists which addresses standing work positions and the potential damage. The general conclusion of this research is that floor mats are an important element in injury prevention efforts.
Blood flows from the heart through the arteries to the extremities. When you walk, it is pumped back through the veins by the interaction between muscles and veins. This mechanism is commonly referred to as the venous pump. When you stand, gravity will make fluids settle in feet and legs and because of the reduced muscle activity, the venous pump is less effective. This causes increased pressure on the walls of the veins, which leads to long-term damage and swelling which causes pain and discomfort.
How The Venous Pump Works
Figure 1 shows a muscle (in red) at rest next to a vein. Flapper valves in the vein allow blood to flow up from below but not down from above (illustrated by the arrows). In Figure 2, the muscle contracts and exerts pressure on the side of the vein. This causes blood to flow up through the valve above while the valve below remains closed ensuring proper circulation towards the heart. |