• California State University, Northridge

• KIN 446

KIN 446 Lab: Week #7 Problem Set

Fall ‘25

Scott Amiss, M.S.

1. Jeffrey is a 40-year-old male who is attempting to improve his cardiovascular fitness. He has started running to achieve

that goal for about 3 weeks. After work, Jeffrey runs on a treadmill in the gym on the ground floor of his office building. For

each of the following problems, be prepared to show your work (calculations) as necessary.

a. What is Jeffrey’s estimated HR max, given his age?

b. If, after 20 minutes of running on the treadmill at his heartrate is 140 bpm, what % of estimated HR max is

Jeffrey running?

c. Based on your answer in 1b (above) at what % of his VO2 max if Jeffrey running?

d. Is Jeffrey’s effort considered to be moderate, heavy, or very heavy? Justify your answer.

e. At the pace (or intensity) described above, is Jeffrey likely running above or below his lactate threshold?

f. If, at the pace described above, Jeffrey’s RER is 0.94 and he is consuming 13.5 L O2/min, how much CO2 is

being produced in L CO2/min?

g. With an RER of 0.94, is Jeffrey using more fat or CHO as fuel? Justify.

2. Consider 24 molecules of glucose that are produced by glycogenolysis is skeletal muscle tissue. The subsequent

molecules of G6P will be completely oxidized. You must be able to show your calculations. Get in the habit of organizing

your work well, so that I can understand your thought processes.

a. Name the enzyme associated with glycogenolysis: _____________________________________

b. What is the net number of ATP produced via substrate-level phosphorylation? __________

c. What is the total number of ATP produced via oxidative phosphorylation? __________

d. What is the total number of carbon dioxide molecules produced? ____________

3. Consider 9 triglycerides comprised of 14 carbon FFAs that will be completely oxidized. You must be able to show your

calculations. Get in the habit of organizing your work well, so that I can understand your thought processes.

a. What is the total number of ATP produced from the synthesis of FADH? __________

b. What is the net number of ATP produced via substrate-level phosphorylation? __________

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4. Consider the graph above.

a. What relationship (or relationships) does this graph describe or illustrate?

b. At what treadmill speeds does the individual reach lactate threshold (LT) pre- and post-training?

c. At what treadmill speeds does the individual achieve VO2 max pre- and post-training?

d. At what speeds does data collection begin and end?