Unit 3

Unit 3 - UNIT 3 STUDY QUESTIONS 1 Many times endurance...

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UNIT 3 STUDY QUESTIONS 1. Many times endurance athletes will find that near the end of a long distance run they feel better (less exhausted) if they take a couple of quick deep breaths. Why would this practice make them feel better? a. Quick deep breaths eliminate CO 2 (raise pH) b. Our perception of effort (hard work) is tied to breathing rate: with pH elevated and CO 2 eliminated, breathing rate decreases so you feel like you are not working as hard. c. Remember that CO 2 is the best way to control breathing i. It’s produced in the Krebs cycle ii. CO 2 indicates that NADHs and FADHs are being produced and will require oxygen in the ETS iii. A buildup of CO 2 is an indicator that oxygen is needed 2. Will endurance athletes gain any performance advantage by including deep-breathing exercises to their workouts? a. Lung capacity is not a limiting factor in endurance performance (i.e. we NEVER use 100% of our lung capacity b/c of residual volume); more is not better if you aren’t even using it all to begin with. The simple answer: No. 3. Explain how one could determine if a person’s VO 2 max was limited by the amount of available oxygen or the amount of mitochondria. a. A-v O 2 difference is controlled by the availability of oxygen OR the number of mitochondria (Remember, more is only better if you are at a deficit) b. We can determine the limiting factor by increasing oxygen intake: i. There is 21% oxygen (concentration) in air ii. Give someone double that (i.e. ~50% oxygen) iii. If you double the amount available and your VO 2 max does not increase, this tells you that oxygen availability was not the limiting factor; therefore, you must be at a deficit of mitochondria you have ample oxygen available but not enough mitochondria to use it iv. If you double the amount of oxygen available and VO 2 max does increase, this tells you that oxygen availability was the limiting factor you have plenty of mitochondria with the capacity to use more oxygen than was available. c. Women endurance athletes would benefit from higher amounts of oxygen because the average woman cannot carry as much oxygen in their blood b/c they have less Hb. i. Increase the amount of Hb and/or RBCs in blood by “blood doping” or Erythropoetin d. Most trained athletes have more mitochondria than they can deliver oxygen to so oxygen availability becomes the problem; this is proven by the fact that more oxygen improved their performance (increased VO 2 max) 4. Why does a high resting systolic blood pressure indicate cardiovascular problems? a. BP is a function of blood volume, wall tension/stiffness, and vessel diameter b. If SBP is high at rest, blood volume is not the issue c. Stiff walls and reduced vessel radii are linked to atherosclerosis (hardening of the arteries) i. Ace-inhibitors = drug of choice b/c they prevent rennin from making angiotensin II which is a vasoconstrictor these inhibitors keep the vessels dilated 5. Why do regional blood-flow shifts occur during exercise? a.
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This note was uploaded on 05/12/2011 for the course KIN 3515 taught by Professor Nelson during the Spring '09 term at LSU.

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Unit 3 - UNIT 3 STUDY QUESTIONS 1 Many times endurance...

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