EXERCISE AND SPORTS PHYSIOLOGY

CARDIOVASCULARRESPONSE TO EXERCISE

Presented by: AVIK BASU

The following aspects of cardiovascular system are influenced by exercise:

1. Blood Flow Distribution

2. Heart Rate

3. Cardiac Output4. Blood Pressure

REGULATION OF

BLOOD FLOW

What is auto-regulation?

It is a manifestation of local blood flow regulation in a particular organ

system at tissue level

Metabolic

Myogenic

Metabolic Theory of Auto-regulation

Pre-capillary Sphincters Closed

Pre-capillary Sphincters Opened

During Exercise…

Blood Flow Redistribution during Exercise

GOALS OF BLOOD FLOW REDISTRIBUTION

• Satisfy the altered nutritional requirement

• Keep the core body temperature at a constant

• Maintain perfusion of the essential organs

REGULATION OF

HEART RATE

DURING EXERCISE...

Catecholamine release

Stimulation of B1 receptors of heart

Positive chronotropy

AT REST DURING EXERCISE

REGULATION OF

CARDIAC OUTPUT

FACTORS RESPONSIBLE FOR INCREASED CARDIAC

OUTPUT IN EXERCISE

• Increased venous return to the heart

• Positive inotropy

• Positive chronotropy

GRAPHICAL REPRESENTATION OF THE RELATIONSHIP BETWEEN CARDIAC OUTPUT,

VENOUS RETURN AND INOTROPY AND THEIR CHANGES DURING EXERCISE

REGULATION OF

BLOOD PRESSURE

EFFECT ON SYSTOLIC BLOOD PRESSURE

Catecholamine release during exercise

Positive chronotropy and inotropy

Rise in Systolic Blood Pressure

EFFECT ON DIASTOLIC BLOOD PRESSURE

In Aerobic Exercise…

DBP is decreased

In Anaerobic Exercise…

DBP is increased

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