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Short term effects of exercise on the Respiratory system

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Jim Scoffham

on 4 March 2013

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Transcript of Short term effects of exercise on the Respiratory system

Short term effects of exercise on the Respiratory system.
1. Increased Breathing Rate
2. Increased Tidal Volume Increased Breathing Rate Answers A short term effect of exercise on the Respiratory system is an increase in breathing rate. This is due to the muscles demanding more oxygen and an increase in carbon dioxide levels stimulates faster and deeper breathing. Like your heart rate there is an anticipatory rise in breathing rate before exercise. When someone starts to exercise there is a big increase breathing rate, receptors in the muscles and joints send signals to the brain to increase breathing rate.

When carrying out aerobic exercise breathing rate continues to rise, exercise intensity determines whether breathing rate remains constant. Breathing rate will continue to rise until an individual is exhausted. When an individual has stopped exercising breathing rate will rapidly drop and then slowly drop to resting breathing rate. Neural & Chemical control The brain is responsible for the control of the breathing rate in the human body. The breathing process involves two different actions.
1. Inspiration - Refers to the active process
2. Expiration - Refers to the passive process
Neural and Chemical factors control breathing in the human body, stretch receptors in the lungs detect the increase in the rate and depth of breathing. The respiratory centres in the brain, the medulla and pons send nerve impulses to the respiratory muscles which control breathing (diaphragm and intercostal muscles).

When exercising these centres respond to central and peripheral information. Chemoreceptors also conduct information, such as the aortic arch and the carotid arteries, which respond to changes in partial pressure. Mechanoreceptors in the joints, tendons and active muscle assess movement and metabolic activity may also feed in information. The volume of air that is breathed
in and out per breath, this
is approximately 500cm3
when the body is at rest. Increased tidal volume Of the 500cm3 only 2/3 of this
reaches the alveoli (350cm3)
where gaseous exchange
takes place. When we exercise tidal volume increase to allow more air to pass to the lungs. Minute volume is used to measure the amount of air passed through the lungs each minute which combines breathing rate and the amount of air taken with each breath.
When we exercise oxygen is depleted from the body triggering an increase in tidal volume, this happens in both aerobic and anaerobic exercise. 1. Muscles require more O2 and higher CO2 in the blood.
2. Anticipatory response (slightly rises)
3. Breathing rate increases due to exercise intensities and becomes consistent throughout exercise due to different intensities. After exercise your breathing rate rapidly drops until breathing becomes normal again.
4. The brain (pons and medulla)
5. Stretch receptors in the lungs detect increase and depth of breathing
6. Diaphragm and Intercoastal muscles
7. Respond to chemical changes (stimuli) such as the cartoid artery and aortic arch.
8. Assess any movement or metabolic activity and transfer information.
9. Tidal volume is the amount of air breathed in and out in one breath.
10. 500cm3
11. Allow more air to pass to the lungs.
12. The measurement of air passed through the lungs in one minute.
13. Oxygen is depleted from the human body resulting in more oxygen
needing to get into the body.
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