Exam 2

Question 1

List the four assumptions we make when doing sub-maximal testing?

Answer 1

1. A steady state HR is obtained for each exercise work rate.
   - A HR taken more than once that doesn’t differ > 5bpm
2. A linear relationship exists between HR and work rate.
   - Linear = HR 110>150
3. The maximal HR for a given age is uniform.
4. Mechanical efficiency is similar for everyone.

Question 2

Why is there not a linear relationship between HR and work rate when HR < 110?

Answer 2

Your CO is increased more due to SV than HR.

Question 3

Why is there not a linear relationship between HR and work rate when HR > 150?

Answer 3

SV no longer affects the increases in HR, it plateaus because your at 40-50% VO2max.

Question 4

How do arrhythmias occur?

Answer 4

Hypoxia, Ischemia, Sympathetic activation, Drugs, Electrolyte imbalances, Bradycardia, Stretch.

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