Lecture 22 - Integration IV Flashcards
What is cardiovascular drift?
The increase in HR at the same intensity of exercise
Why do we have a cardiovascular drift?
Because as exercise continues, we start to dehydrate and lose blood volume, this decreases SV thus increasing HR
Why do we have hypertrophy of left ventricle during aerobic training?
– Increase in stroke volume
– Increase in cardiac output
– Increase in contractility- more force/beat (increased SNS)
What is the change in resting HR due to exercise training?
↓Markedly (~1 beat/min per week of training)
↑ Parasympathetic signalling to the heart
What is the change in submaximal HR due to exercise training?
↓HR for same intensity
More noticeable at higher submaximal intensities
What is the change in Maximal HR due to exercise training?
No significant change with training
↓with age
What are adaptions to the vascular system from aerobic exercise?
Increased blood volume, including plasma levels.
* antidiuretic hormone, aldosterone- acts on kidneys to reabsorb water
Increased red blood cells and haemoglobin
What are muscle adaptations to exercise training?
Muscle cells - Increased mitochondria and oxidative enzymes
Capillary supply - Increased number of capillaries
Myoglobin - Increased myoglobin content by 75 to 80% + supports increased oxidative capacity in muscle
What way does the curve shift when there are increased capillaries with exercise training?
To the right
Why does the anaerobic threshold improve with training?
Because lactic acid can be combusted at greater rate
