Twenty-year-old Jewell was a high school athlete who is now in her sophomore year of college. The transition from high school to college was challenging for Jewell and she rarely exercised her freshman year of college. Jewell has now started a training program with a goal of running in a 10K race in three months. Which of the following adaptations have been found following several months of endurance training?
A. Decrease in muscle cell mitochondria density
B. Decrease in VO2 max
C. Increased use of muscle glycogen as an energy source
D. Increase in GLUT-4 receptors
Answer: D
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