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BPK 143 Chapter Notes -Vo2 Max, Blood Sugar, Glycogen

Biomedical Physio & Kines
Course Code
BPK 143
Tony Leyland

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Study Questions
As with many of the questions in the later topics, some answers will require you to call
on information from previous chapters and lecture notes.
1. Describe two factors that determine the percentage participation of fats versus
carbohydrates in energy metabolism during exercise.
Duration greater duration = greater percentage of fat energy metabolism
Intensity greater intensity = greater percentage of carb energy
2. Describe the advice that you would give to a marathon runner in regards to the
following dietary procedures:
Eating a chocolate bar 30 minutes before the race.
1. Glycemic index is high. It will induce a great insulin release that
will continue to invoke glucose storage as glycogen even when the
race starts, lowering blood glucose levels further. This will lead to
early fatigue
Ingesting glucose during the race.
1. Take sports drinks that are less than 10% conc’n of glucose for
events lasting longer than 1 hr. at 60% VO2 max or greater. The
low glucose conc’n will help your body absorb the fluids to
prevent dehydration. The glucose will help replace electrolytes
3. Explain how diet can affect athletic performance. Be specific.
High carb diet results in high glycogen levels in muscles, that will allow
the athlete to perform longer
4. In terms of fuel utilization during exercise, describe the role played by the liver.
Glycogen is stored in the liver. This glycogen can be broken down into
glucose to raise glucose levels in blood and have that glucose used as
energy fuel
5. Describe the four different roles that carbohydrates play in the body during
Provide energy source
Protein sparing
Carbs are needed to promote fat metabolism for fuel
Primary fuel for Central Nervous System (Brain and nerves).
6. List the approximate percentage of the daily calories that should come from
protein, from fats and from carbohydrates for an elite marathon runner.
60% carbs
15% protein
25% fats
7. Less experienced marathon runners may experience a phenomenon called "hitting
the wall." This usually happens at approximately 18–22 miles in the race. The
runner suddenly starts to feel very fatigued. He is able to carry on, but only at a
reduced pace. He may feel that he should be able to go faster, but his legs will not
respond. From a physiological standpoint, what has happened to the runner, and
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