Question

What are the normal responses of SBP, DBP, and MAP with increasing exercise intensity? Provide physiological rationale for the normal responses of SBP and DBP.

Answer 1

Answer:

* Blood pressure responses to exercise.

* Systemic blood pressure (SBP) increses linearly with increse in exercise activity.

* In a normal or healthy person with normal systolic pressure of 120 mmHg.

* Vigorous aerobic fitness training can increase systolic pressure to 180 mmHg and take 10-20 minutes to return to resting levels.

* systolic pressure surpasses 200mmHg during and after exercise.

* Diastolic pressure changes significantly during exercise.

* Blood pressure reading surpasses 180/120 mmHg during and after exercise.

* During exercise the cardiac output increases more than the total resistance decreases.

* so the MAP(mean arterial pressure) usually increases by small amount.

* Pulse pressure markedly increases because of an increase in both stroke volume and the speed at which the stroke volume is ejected.

* Metabolic syndrome may influence vascular reactivity and might cause an excessive increase in blood pressure during dynamic exercise.

* In the high to normal BP subjects, the dyslipidemia or hyperglycemia associated with progressive increase of MAP during exercise.

* The physiological basis of the systolic and diastolic blood pressure values include normal systolic pressure less than 120 mmHg and diastolic blood pressure less than 80mmHg.

* The difference between the systolic and diastolic pressures is the aortic blood pressure which typically ranges between 40- 50 mmHg.

* During upright exercise, the normal B.P response is to observe a progressive increse in systolic B.p. with no change or even slight decrease in diastolic blood pressure.

* The slight decrease in diastolic blood pressure is due primarily to the vasodilation of arteries from the exercises bout.