Effects of 8 Weeks of Head-down Strong Abdominal Breathing Training on Middle Cerebral Artery Hemodynamics
In order to examine the effects of head-down strong abdominal breathing on middle cerebral artery hemo-dynamics in male undergraduates in three different positions,37 male undergraduates were randomly divided into two groups.Before and after completing 8 weeks of strong abdominal breathing in the head-down-90°(HDT-90°)po-sition without any training(control group)or in the HDT-90° position(experimental group),ultrasound was used to measure static middle cerebral artery flow velocities and internal diameters and to determine the resistance to flow in the three postural sequences:the upright position,the supine position,and the HDT-90°position.The results showed that there was no significant change in the internal diameter of the middle artery before and after the experi-ment(P＞0.05),and the experimental group showed an increase in resistance to blood flow in all three posi-tions.Blood flow velocity in the control group in all periods after the intervention decreased in all three positions,with peak systolic velocity decreasing significantly in the HDT-90°(P=0.022),end diastolic velocity decreasing in the supine position and in the HDT-90° with a very significant decrease(P=0.003 and P=0.005),mean flow veloci-ty decreased significantly in all three positions(P＜0.05),with a more rapid decrease in the supine position(P=0.007).Blood flow velocity in the experimental group decreased slightly in all periods in the three different positions,but none of them was significant(P＞0.05).Head-down strong abdominal breathing can be used as an intervention to slow down the decline in middle cerebral artery blood flow velocity to some extent.
middle arteryhead-down strong abdominal breathingdifferent body positions
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