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Preliminary PDHPE. Core 2. Dot Point 8
Transcript of Preliminary PDHPE. Core 2. Dot Point 8
Core 2- The Body In Motion
-Before, during and after exercise.
- Changes occur to give the body oxygen and nutrients.
These responses are specific
Increase? OR Decrease?
What could happen?
These Responses are Crucial
Increase in oxygen Before we start
Body begins to adapt to increased demand of exercise during the steady state.
During steady state heart rate varies dependant on intensity.
The average heart rate is 72bpm where as champion endurance athletes have been know to have heart rate between 27-28 beats per minute at rest.
How much oxygenated blood is pumped from the heart in one minute.
oxygen pumped more frequently
Moves to the muscles with a demand for oxygen
begins to slow
returns to its normal
The amount of air taken into the lungs per minute
Depth of breath
Frequency of breathes
Rest=12 Breathes/min=500ml of air
Change breathing to supply sufficient oxygen
After exercise breathing
remains rapid for a short
amount of time.
Heart Rate x Stroke Volume= Cardiac Ouput
Demands means that the bodies blood must be redirected to active muscles
At rest muscles recieve 20%
During exercise muscles recieve 84%
Trained and untrained
Chemical formed during
breakdown of carbohydrates
Small amount circulating through the body
As intensity rises so does the
concentration of lactic acid.
For each lactate that is formed a hydrogen ion is also formed.
Ph drops below 7 making it harder for us to perform activities.
Lactate Infection Point
Examine the reasons for changing patterns of respiration and heart rate during and after submaximal physical activity
untrained VS trained
When inceased demand is put on the
body sudden changes occur to survive.
Also flucutions depending on intensity
eg. Jogging to Sprinting
Cardiac Output= SVxHR
Immediate Physiological Responses
Changes within the body
Ensure enough oxygen/nutrients supplied
Meet the demands of exercise