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The Physiology of Fitness

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by Michelle Thomas on 11 October 2013

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Transcript of The Physiology of Fitness

The Physiology of Fitness
The Cardiovascular System
Michelle Thomas

CV - Acute responses
As you exercise your body builds up waste products within the muscles cells which must be removed.
Acute responses of your cardiovascular system include the delivery of oxygen to the working muscles and also removal of waste products from the muscles cells.
The cardiovascular system work together to allow you to meet the increased demands placed on it with exercise.

Acute Responses
Increased Heart Rate-
A resting heart rate averages between 60 and 80 beats per minute. However age and fitness levels can affect this.
Research suggest that resting heart rates can be as low as 20 to 40 beats per minute in endurance-trained athletes.

Heart rates will differ dependent upon the nature of the exercise.
High intensity exercise = Higher heart rate
Low intensity exercise = lower heart rate responses.
Redirection of Blood

As exercise begins, your active skeletal muscles demand an increased blood supply, and your sympathetic nervous system redirects your blood from areas where it is not essential to your working muscles

During this process there is a reduction in blood flow to your kidneys, liver, stomach and intestines.

As your body temperature to rises more blood is redirected to your skin to conduct heat away from your body's core.


What is the Cardiovascular system?
Your cardiovascular system consists of your heart, blood vessels and blood.
The function of the CV Systems include to deliver nutrients and oxygen to, and remove waste from, the cells of your body.

Increased Stroke Volume


Stroke volume is defined as the amount of blood ejected from your heart with each contraction (ASCM).
Acute responses - The SV increases at the initial stage of exercise & increasing rates of work.
The SV increases only up to exercise intensities of about 50 percent of your maximal capacity (Heart rate max is 220-Age).
Following the sudden increase in heart rate the SV plateaus and your heart rate increases to deliver blood to your working muscles.

Increased Cardiac Output

Cardiac output is the combination of stroke volume and heart rate.
the acute responses during exercise include an increase in heart rate and an increase in the amount of blood ejected from the heart with each muscle contraction. In essence the overall cardiac output also increases as oxygen is transported to the working muscles.
Increased Systolic Blood Pressure


The acute responses to exercise include a increase in your systolic blood pressure.
As the intensity of exercise increases SBP proportionately increases.
An increased cardiac output results in an increase in blood flow around the body.
This increases pressure on the walls of your vessels.
Increased blood pressure helps drive your blood quickly through your vessels.


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