Which of the following is a correct statement about the energy systems and fuels used by the body? Question 4 options: a) The lactic acid system is the predominant source of energy after 3 minutes of activity and until activity has reached 20 minutes in length. b) After 20 minutes of sustained activity, fuel for the muscles primarily comes from glucose that is broken down by glycolysis. c) All energy systems are used at all times, but one system dominates depending on intensity and conditioning of athlete. d) About 90 percent of the fuel is derived from fat at rest. e) An anaerobic energy system is the most efficient way to fuel the body for prolonged activity.
Question
Which of the following is a correct statement about the energy systems and fuels used by the body? Question 4 options:
a)
The lactic acid system is the predominant source of energy after 3 minutes of activity and until activity has reached 20 minutes in length.
b)
After 20 minutes of sustained activity, fuel for the muscles primarily comes from glucose that is broken down by glycolysis.
c)
All energy systems are used at all times, but one system dominates depending on intensity and conditioning of athlete.
d)
About 90 percent of the fuel is derived from fat at rest.
e)
An anaerobic energy system is the most efficient way to fuel the body for prolonged activity.
Solution
The correct statement about the energy systems and fuels used by the body is:
c) All energy systems are used at all times, but one system dominates depending on intensity and conditioning of athlete.
Explanation:
The body uses three main energy systems: the ATP-PC system, the glycolytic (lactic acid) system, and the oxidative (aerobic) system. All three systems are always active, but depending on the intensity and duration of the activity, one system will dominate.
For example, during high-intensity, short-duration activities, the ATP-PC system is the primary source of energy. As the intensity decreases and duration increases, the glycolytic system becomes more dominant. Finally, for low-intensity, long-duration activities, the oxidative system is the primary source of energy.
The conditioning of the athlete also plays a role in which system is dominant. Trained athletes are able to use the oxidative system more efficiently and for longer periods of time compared to untrained individuals.
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