.. Flashcards
(12 cards)
Regulation of breathing
Phrenic nerve
Stimulates the diaphram to contract
Regulation of breathing
Intercostal nerve
Stimulates external intercostals to contract
Regulation of breathing
Inspiratory centre
- Increased stimulation of phrenic nerve-diaphram contracts with more force
- Increased stimulation of intercostal nerve-external intercostals contract with more force
- Stimulates sternocleidomastoid and pectoralis minor
- Increased volume of thoracic cavity and decreased pressure in lungs
- More air rushing in- Increased depth of breathing
Regulation of breathing
Hering-Breur reflex
Specialised baroreceptors/stretch receptors between ribs monitor level of stretch in lungs (safety)
Once threshold is reached, EC becomes active and additional muscles contract to expire faster and greater
Regulation of breathing
Expiratory centre
- Stimulates internal intercostals and rectus abdominis
- This decreases volume of thoracic cavity and increases pressure in the lungs
- More air rushes out- increased rate of breathing
Describe and explain the effect of different exercise intensities and recovery on breathing frequency
- F increases linearly with exercise intensity because of increased 02 demand from muscles so system needs more volume of 02 in the lungs
- F plateous as intensity continues to rise toward maximal intensity-there is a min time for inspiration to ensure enough 02 enters lungs
- F plateous during sustained submaximal exercise-02 demand=02 supply and enough 02 is delivered to the muscles
Describe and explain the effect of different intensities and recovery on TV
- TV increases linearly with exercise intensity.. because 02 demand from muscles increases so the respiratory system needs more volume of 02 in the lungs
- TV plateous during submaximal intensity- Increased TV means there is not enough time during inspiration or expiration for any greater volume of air to be be breathed in or our
Effect of different exerice intensities and recovery on VE during submaximal exercise
- Increased VE before exercise-anticipatory rise due to adrenaline
- Fast Increase in VE at start of exercise-meeting 02 demand
- VE plateous, body reaches steady state, 02 supply=02 demand from muscles
- Fast decrease at end of exercise during recovery due to decreased 02 demand from muscles
- Slower decrease in VE during recovery, allows lactic acid to be removed by having enough 02 supply
Difference of maximal exercise and recovery on VE
- No steady state reached - the supply of oxygen never catches up with the demand from the muscles.
- Recovery time takes longer for VE to return to its pre-exercise value – higher intensity means there was more anaerobic work and more lactic acid to remove.
what does EPOC stand for
Excess post-exercise oxygen consumption
Recovery
Alactic component
- Fast component of EPOC
- Replenishes ATP and PC stores
- Resaturation of myoglobin and haemoglobin with oxygen
- Duration-3 mins, 50% of PC in 30secs
Recovery
Lactacid component
- Slow component of EPOC
- Elevated circulation
- Elevated ventilation
- Elevated body temp
- Removal of lactic acid
- Duration-1hour
