Kin 310 Questions - Energy and Work Load

1. Discuss the concept of Rate limiting Factor. Why is it important to consider when studying exercise physiology and training? Provide one physiological example to clarify your understanding.

2. Define the terms work, power, and energy; include the common units for each term.

3. Calculate the total amount of work performed in five minutes of exercise on a cycle ergometer, given the following;

a. Resistance on the flywheel = 2.5 kp

b. Cranking speed = 60 rpm

c. Distance traveled per revolution = 6 meters.

(use units for work to determine how to calculate result)

4. Compute total work and power output per minute for ten minutes of treadmill exercise, given the following;

a. Treadmill grade = 15 %

b. Horizontal speed = 200 m/min

c. Subject’s weight = 70 kg

(see text for formula)

5. Briefly describe the procedures used to estimate energy expenditure using direct calorimetry and indirect calorimetry. What is the historical significance of the Atwater-Rosa Calorimeter (fig 4-8 Brooks)?

6. Calculate gross efficiency, given the following;

a.  O2 uptake – 1.5 L*min-1 and work rate – 600kpm*min-1

b. O2 uptake – 3.0 L*min-1 and work rate – 1200kpm *min-1

(see text for formula and assumptions)

7. Explain the physiological considerations that allow you to estimate energy cost via heart rates. What factors must you take into consideration? Why?

8. Describe two methods for determining the daily energy expenditure of a worker. Give two examples each of types of work that are classified as light, heavy, or extreme.

9. Describe, through definition, the difference between Respiratory Quotient (RQ) and Respiratory exchange ratio (R). Use fig 4-10 in Brooks to discuss the application of R value in exercise physiology. Explain how the R value could become greater than one?

10.

a) Sketch the relationship between oxygen utilization and work rate for a 30 year old individual with a VO2 max of 60 mlkg-1min-1.

b)  On a second graph, sketch the relationship between heart rate and oxygen utilization for this individual. Include units on both your graphs.

c)  In a different color on both graphs above, sketch in the relationships for a 30 year old individual with a VO2 max of 40 mlkg-1min-1.

d)  Label the approximate HR responses for both individuals (on the second graph) when they are working at the absolute VO2 of 35 mlkg-1min-1 and at the relative rate of 75% of their own aerobic capacities.