Q.) Before heading to the Tour de France a cyclist had a muscle biopsy in his le

Question

Q.) Before heading to the Tour de France a cyclist had a muscle biopsy in his leg. The tests revealed that the dominant muscle fibers were low in myosin ATPase activity and anaerobic enzymes, high in capillary density and myoglobin content.

a.) What muscle fiber is dominant in this athlete? Why? (.5 for type, .5 for explanation)

b.) What is the primary source of ATP generation in this muscle for the athlete as he steadily climbs the mountains of France? (think to your metabolism knowledge from unit 1) (.5 point)

c.) For this athlete to maintain force production, what direct change in ion concentration must occur (identify specific ion, cellular location, and if the concentration level will increase or decrease) (hint what ion directly influences fibers that allow for muscle force to occur)? (.5 for each of the three parts)

d.) What factors determines fore output in a muscle contraction, provide a brief explanation/reason to your answer? (1 point)

Explanation / Answer

a) The athlete is having Type 1 muscle fiber dominant which is also called Slow twitch oxidative fibers.

b)The Slow twitch oxidative fibers or Type I fibers are performed in low-intensity workouts take an example of low resistance exercises which aims for endurance and covers a long distance. These fibers are having highly resistive to get fatigue and contraction times are slow. The fibers comprise high myoglobin content, mitochondrial as well as capillary density. The fibers consist of low glycogen content, as well as creatine phosphate and high triglycerides ST fibers, few glycolytic enzymes. The amount of the enzymes involved in the oxidative pathways or Krebs cycle is high. The aerobic activities involve the activation of these ST fibers they acquire low production of force and mainly found in endurance athletic training.

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.