Week 6- brain blood flow and exercise

Question 1

What percentage of cardiac output does the brain require?

Answer 1

20%

Question 2

What is a stroke caused by?

Answer 2

Over or under perfusion

Question 3

What are the functional consequences of a stroke?

Answer 3

-performance
-cognitive function
-prognostic value (predictor of cardiovascular mortality)

Question 4

What effects does exercise have on the brain as we age?

Answer 4

affects the decline and limits the reduction in size and blood flow to the brain

Question 5

What are the two ways to measure brain blood flow?

Answer 5

-near-infrared spectroscopy system
-MRI

Question 6

What does the Transcranial Doppler measure?

Answer 6

blood velocity as an index of flow

Question 7

When is the Transcranial Doppler a good tool for brain imaging?

Answer 7

when you are wanting the measure the effects of moving

Question 8

What does near-infrared spectroscopy measure?

Answer 8

the balance of oxygen supply and oxygen demand directly at a capillary level in the cerebral cortical tissue

Question 9

What are the strength of using near-infrared spectroscopy?

Answer 9

-gives a measure of brain activation
-is portable and robust

Question 10

What occurs during metabolism to the regulation of brain blood flow?

Answer 10

more neurons fire, the more demand there is and the more supply

Question 11

What happens to blood pressure during regulation of brain blood flow?

Answer 11

systemic changes in blood pressure has changes in blood flow

Question 12

What occurs when there are neurogenic effects for the regulation of brain blood flow?

Answer 12

neurogenic protects hypotensive injury, little impact

Question 13

How does cardiac output have an impact on the regulation of brain blood flow?

Answer 13

increases in stroke volume and heart rate and increased brain blood flow

Question 14

What causes fainting and hypotension during endurance exercise?

Answer 14

dilation of vessels during exercise and when exercising stops the vessels are still dilated leading to fainting as a coping mechanism for the brain

Question 15

What causing fainting when lifting weights?

Answer 15

increase in blood flow and then the drop in blood flow to the brain decreases

Question 16

What does hyperventilation before exercise cause?

Answer 16

decreases carbon dioxide and increases vasodilation which leads to the drop in blood pressure

Question 17

What happens to brain blood flow if we increase intensity causing a decrease in carbon dioxide?

Answer 17

Brain blood flow decreases

Question 18

What happens to brain blood flow if we perform mild to moderate exercise?

Answer 18

increase in brain blood flow