What is abdominothoracic respiration?

Abdominothoracic respiration is the type of respiration dominant in males.In this type of respiration the muscles of stomach and diaphragm play a greater part than the thoracic muscles.The dominant respiration in females is thoracoabdominal respiration in which thoracic muscles are dominant.It is speculated the thoracoabdominal respiration(IN WHICH ABDOMINAL MUSCLES ARE USED LESS THAN THORACIC MUSCLES)help women in maintaing the respiratory movements in pregnancy when a great volume of abdomen is used up by the fetus.