Measuring The Health of Your Heart Heart Health Your heart pumps blood through your body to provide it with oxygen and nutrients Oxygen and nurients react to release energy that our bodies use for things like moving and thinking ID: 626305
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Slide1
Cardiac Output
Measuring The Health of Your HeartSlide2
Heart Health
Your heart pumps blood through your body to provide it with oxygen and nutrients.
Oxygen and
nurients
react to release energy that our bodies use for things like moving and thinking
While most of your cells have enough nutrients to last a while, they need a constant supply of oxygen
The more blood your heart can pump, the more oxygen it can give your cells and the more energy you can useSlide3
Heart Health
You use the most energy when you exercise. That is why your heart has to pump more oxygen to your muscles. Also, when you exercise, your blood vessels change their diameters to redirect blood flow to your musclesSlide4
Cardiac Output
Still, some people have stronger heart than others. Their heart can pump more blood and allow them to do more work
The amount of blood that your heart pumps in a minute is called
Cardiac Output (Q)Slide5
Calculation of Cardiac Output
How is it measured?The total amount of blood your heart pumps in a given time is equal to the number of beats (heart rate) times the amount of blood the heart pumps in each beat (stroke volume).
Cardiac Output = Heart Rate x Stroke VolumeSlide6
Cardiac Output
Cardiac output is usually measured in Litres
per minute
When someone is resting, their cardiac output is usually 5-6 L/min
Question:
If someone has a resting heart rate of 70 beats/min and a resting cardiac output of 5.5 L, what is their stroke volume??Slide7
Cardiac Output Question
Answer (Using Grass Method):
Given - cardiac output (Q)= 5.5 L
heart rate (HR) = 70 beats/min
Required – Stroke Volume (SV)
Analysis - Q = HR x SV
so SV = Q/HR
substitute SV = 5.5/70
Solve: .079 L or 79 ml
Statement: His stroke volume is 79 mlSlide8
Effect of Training on Cardiac Output
Aerobic, or cardiovascular exercise (e.g. distance running, swimming or bike riding) makes the heart stronger.
This will cause the heart to increase its stroke volume which will allow it to beat slowerSlide9
Comparing Normal Hearts with Strong Hearts
Normal heart
Strong heart
Cardiac output at rest is 5-6 L/min
Resting Heart Rate is ``60-85 beats/min
SV at rest is usually 70-80 ml
Maximum Q = ~20 L/min
Cardiac output at rest is 5-6 L/min
Resting Heart Rate is ~40-60 beats/min
SV at rest could be as over 120 ml
Maximum Q = ~40 L/minSlide10
Resting Heart Rate and Fitness
So the lower your resting heart rate, the stronger your heart. But it also depends on your ageSlide11
Practice Quesions
1.
If
the cardiac output is 6.3 L/min and the pulse rate is 80 beats/min, what is the stroke volume
?
2
.
If the stroke volume is 65 mL/beat and the cardiac output is 5.7 L/min, what is the heart rate?
TRY THEM!!