Because Mary wants to enter a marathon, she decides to consult a trainer who happens to be a kinesiologist. The trainer advises her on what type of muscle fibers she needs to develop and how she should train for it. Which type of muscle fibers are involved? Briefly explain the anatomy and physiology of the trainer's advice.
What will be an ideal response?
As marathons require aerobic endurance, Mary would want to develop her slow fibers for long-term endurance. She would achieve this by engaging in activities that involve long-term mild to moderately intense workouts involving mostly leg and postural muscles, such as jogging, biking, swimming, and core exercises. Repeated long-term stimulation will help the slow fibers develop more mitochondria and a higher concentration of aerobic enzymes as well as slightly increase the size and strength of the muscles (hypertrophy).
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