Transcript Aerobic Capacity2

Health Components
of
Physical Fitness
Aerobic Capacity
Aerobic Capacity
definition
Aerobic capacity is the
ability to take in, transport
and use oxygen to sustain
prolonged periods of
aerobic/sub-maximal work.
Aerobic capacity
• The definition shows that aerobic capacity is
dependent upon the efficiency of the systems
studied in the AS year
• Pulmonary ventilation and external respiration
(the take in of 02)
• Internal transport via the heart, blood and
bllod vessels (transport of 02)
• Muscle cells to use 02 for energy production
(use 02)
VO2 MAX
Aerobic capacity is associated with VO2 max and the
two terms are used interchangaebly, but there is a
distinct difference between the two.
VO2 Max is defined as the highest rate of oxygen
consumption attainable during
maximal/exhaustive work
Aerobic capacity Aerobic capacity is the
ability to take in, transport and use oxygen
to sustain prolonged periods of aerobic/submaximal work.
Aerobic Capacity
What are the similarities
and differences between
the 2 definitions?
Aerobic Capacity
Copy down Table 1 P409
Typical values for VO2
MAX!!!!
WATCH EASY
EXPLANATION
Anyways, lets discuss
about VO2 Max.
Something that all
athletes are trying to
push higher and
higher.
Starring in this play
are:
VO2 Max Explained
• To make this discussion simple, I'm using the absolute
definition of VO2 Max as it is simpler and easier to
understand. You can read about the other definition when
you understand more about it. Also I'm omitting a lot of
details as I'm trying to make this as simple as possible.
• So, what is VO2 Max?
To simply put it, VO2 Max is the amount of oxygen brought to
and used by the muscle in a minute. Since oxygen is used in
the metabolism of energy, it can be (directly or indirectly)
translated to capability of the muscle producing energy.
Loosely used, the higher your VO2 Max is, the more power
you produce, the longer you last (hihi).
• VO2 Max in a well-trained person, like Awea.
could reach numbers up to 8L/min!!
In a normally functioning, untrained,
triathlete-wannabe person, the usual VO2
Max level is around 3.5L/min. Like this person
down here.
• Generally, there are 3 ways for the wannabe to
improve his VO2 Max.
1. Optimize muscle condition to utilize oxygen better
(train the muscle).
Like people, muscle behaves in various ways. There
are lazy muscles, there are hardworking muscles.
Lazy muscles need a lot of whipping to get the work
done, kinda like me during school days. So they
require a lot more oxygen to produce enough energy.
Hardworking muscle is different. Because these kind
of muscles are used to hard work, they require less
oxygen to produce the same amount of energy, thus
increasing efficiency.
• 2. Improve blood circulation (have a good heart i.e.
training).
The heart is a natural pump in the body. A weak
heart response poorly to exercise. That is why if you
try to run 5 km after a month of Manjalara-marathon
in front of the TV, you feel your heart is pumping too
fast. A well-worked heart adapts better with exercise,
thus maintaining adequate circulation of blood
throughout the body during physical activity.
• 3. Improve the capacity of blood to carry oxygen
(more training, specifically high-altitude training).
About 42% of blood is made up of red blood cells.
Red blood cells contain haemoglobin, a substance
that is responsible in making your blood red and
carrying oxygen. If you increase the amount of red
blood cells in blood, you will also increase the
capacity of blood to carry oxygen. However, this is
difficult to achieve naturally.
Now, when comparing these 2 types of
muscle in terms of VO2 Max, it will
look something like this:
• The limit for trained muscle is the oxygen
carrying capacity. This happen because the
muscle is now optimized a.k.a. turned to a
lean, mean oxygen-burning machine. On its
own, it can burn virtually limitless amount of
oxygen. The only limit from it doing so is the
supply of oxygen itself.
• The limit for untrained muscle is the muscle
itself. Since weak muscle can't utilize oxygen
optimally, there is a lot of 'oxygen waste'. Even
if you're able to supply the muscle with
maximum amount of oxygen, the muscle
simply can't use them, because it's too weak.
Class presentations
• Well done to all those who performed!!!!!
• CHARLIE HARRIS HAS YET TO BE ASSESSED ON
HIS KNOWLEDGE OF THE AEROBIC
SYSTEM!!!!!!!!!
CHARLIE’S TASK
• IDENTIFY THE PHYSIOLOGICAL ADAPTATIONS
THAT TAKE PLACE AS A RESULT OR AEROBIC
TRAINING AND SAY HOW EACH ADAPTATION
WILL HELP TO IMPROVE A PERFORMERS VO’2
MAX
• PRESENT YOUR FINDINGS AS A REVISION
POSTER THAT YOU AND YOUR CLASSMATES
CAN LEARN FROM…. For tomorrow! p418
Tuesday the 15th March
Open book test
• Complete 10 Revision questions
with help from book Questions
Page 422.
• Need to be completed by end of
lesson ready to be marked!!!
Aerobic capacity complete