How Exercise Duration Affects Recovery Time

Topics: Oxygen, Heart rate, Cellular respiration Pages: 7 (1930 words) Published: May 3, 2013
Investigating a factor that affects the recovery time after exercise. Strand S(a) Formulating a Hypothesis or prediction
I am going to carry out an investigation on how the duration of exercise affects recovery time. Prediction/Hypothesis.
I predict that the longer the duration of exercise, the slower the recovery rate will be and therefore the longer the recovery time will be. I predict this because of several reasons. Reason number 1 being the concept behind respiration during exercise. Heart rate: Heart rate is the number of heartbeats per unit of time measured in beats per minute (bpm) 1) Respiration

The amount of exercise a person does alters the heart rate. Increasing exercise duration will increase the rate the heart pumps, therefore the amount of blood circulating increases. The increased heart rate allows more oxygen to flow to the muscles and increases the amount of carbon dioxide and metabolic waste which needs to be carried out. Respiration

Respiration is the process by which energy is released from glucose. There are two types of respiration. Aerobic respiration, which requires the presence of Oxygen or anaerobic respiration which does not require the presence of oxygen. What is aerobic respiration?

Respiration is a series of reactions that take place within the body. Energy is released from glucose stored in the Mitochondria of our cells . Aerobic respiration is the form of respiration which uses oxygen. The chemical equation for aerobic respiration is as follows: Glucose + Oxygen -> Carbon Dioxide + Water (+ energy)

The reactants glucose and oxygen are used up to form the products; Carbon dioxide, water and the release of energy. Carbon dioxide is a waste product gas and can become toxic if it builds up, the more exercise being undertook the faster and deeper we breathe to rid the body of the excess Carbon Dioxide. This is because he brain detects the rise in carbon dioxide through the levels contained in the blood reaching it , the brain then sends messages along nerves to the chest muscles. Your breathing rate and depth of breathing are then increased. The balanced symbol equation for Aerobic respiration is as follows: C6H12O6 + 6O2 -> 6CO2 + 6H2O (+ energy released)

Anaerobic respiration:
What is Anaerobic respiration?
When the levels of oxygen reaching the muscles during exercise are low, the body uses anaerobic respiration to obtain energy. Anaerobic respiration takes place without the prescience of oxygen. Anaerobic respiration involves the incomplete breakdown of glucose but only releases 5% of the energy released per glucose molecule from Aerobic respiration and is therefore much less sustainable. The chemical equation for anaerobic respiration is as follows: Glucose -> Lactic acid (+ little energy)

Muscle fatigue
Insert conclusion to this theory here.
Muscles become fatigued during long periods of vigorous exercise and stop contracting efficiently. . Consequently Anaerobic respiration can only be used for a short due to little amounts of energy being released per glucose molecule and the production of Lactic acid. The waste product lactic acid is toxic in large amounts. A build up of lactic acid causes cramps which make exercise painful and difficult.

Oxygen debt
Because less energy per glucose molecule is released during anaerobic respiration the breakdown of glucose is incomplete. Anaerobic respiration creates oxygen debt. Oxygen debt: The amount of oxygen needed to oxidise lactic acid to carbon dioxide and water. Oxygen debt is the reason why we have to breathe deeply and quickly after exercise during recovery time. Additional oxygen must be taken into the body after vigorous exercise to restore all the bodies systems to their normal rates. Stages in heart rate recovery:

* The heart rate (bpm) falls
* Breathing rate will return to normal and compensate oxygen debt. The Overall the amount of recovery time depends on the duration and...
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