Download The Cardiovascular system

The Cardiovascular system
Lesson Objectives:
•Be aware of what the cardiovascular (CV)
system consists of.
•To understand what is meant by CV
endurance.
•To consider how CV endurance can be
measured and improved.
The Cardivascular system
This is the name given to the system
consisting of the heart and blood vessels
that circulate and transport blood around
the body.
• Cardiovascular endurance
• This is the ability of the heart and lungs to
keep supplying oxygen in the bloodstream
to the body in order to provide energy to
enable physical movement.
• So when someone takes part in activity that
requires them to move for long periods of
time, they need to take CV endurance into
consideration and try to improve it.
• During sustained activity you will notice:
• Increase in your breathing rate (BR)
• Increase in your Heart rate (HR) – pulse
• Increase in your blood pressure.
• This is because your working muscles are
having more demand put upon them and so
require more oxygen to provide energy.
• Blood pressure: the force of the circulating blood on the walls of the
arteries.
• Improving CV endurance:
• An essential requirement for participants in
physical activity.
• Everyone should look to improve their
levels of endurance or maintain them at a
high standard.
• To do this you must make your heart and
lungs work harder in order to get them to
adapt to the increased demand.
• Your HR has to be kept at a high level for a
period of time.
• The following graph shows the levels your
HR should be raised to relative to your age
using the calculation:
• Maximum HR = 220-your age
• e.g MHR = 220 – 15 = 105
• To gain full benefits of exercise you should
aim to work within the aerobic zone and the
training zone for at least 15 mins.
• Build up your effort slowly and do not do too
much too quickly.
• Testing CV endurance:
• Resting HR : a general indicator. The lower
it is the better your endurance level is.
• HR recovery rate: The quicker this returns
to your normal resting HR, the higher your
endurance levels are.
• These 2 simple tests help you to monitor
your CV endurance levels over a period of
time.
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Examiners tip:
• Questions on this topic are likely to relate to
why levels of CV endurance are important
and the ways in which they can be
improved and measured.