Does the diaphragm aid in the cir­culation of the blood?

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The Diaphragm and the Circulation

Q. Does the diaphragm aid in the cir­culation of the blood?

A. The diaphragm in its downward move­ments, not only draws air into the lungs by an action resembling that of the piston of a pump, but while producing a suction effect in the chest, the descending diaphragm at the same time compresses the liver, stomach and other viscera against the tense abdominal wall; it thus empties them of blood, and so assists the portal circulation, by propelling the venous blood of the abdomen toward the heart.

The influence of the diaphragm also extends to the head and even more remote parts of the body. In fact, the diaphragm is one of the most important factors in the circulation of the blood. 

 In order, however, for the diaphragm to aid the circulation it must have an opportunity to act efficiently. This it cannot do if it is cramped and hindered by tight clothing. As commonly worn corsets and waist bands greatly hinder the action of the diaphragm, preventing it from descending properly.

A stooped or "slumped" position in sitting or standing is most as injurious as waist constric­tion. This position relaxes the abdomen and so prevents the proper ascent of the diaphragm.

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