Megan wants to enter a weight-lifting competition and consults ...

[itsmyluck]

Megan wants to enter a weight-lifting competition and consults you as to what type of muscle fibers she needs to develop and how she should go about it. What would you suggest to her?

Question 2

Thirty minutes after Mary has completed a 25-km race, she begins to notice severe muscle soreness and stiffness in her legs. Her urine is dark colored. She wonders whether she may have damaged her muscles during the race. She visits the ER, and the doctor orders several blood tests. What kind of blood tests can help determine whether muscle damage has occurred?

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Answer to Question 1

Weight lifting requires anaerobic endurance. Megan would want to develop her fast fibers for short-term maximum strength. She would achieve this by engaging in activities that involve frequent, brief, but intensive workouts, such as with heavy weights to the point of muscle fatigue. The fatigue triggers the production of new myofilament proteins, leading to muscle bulk and strength.

Answer to Question 2

If muscle damage occurred, the doctor would find enzymes such as creatine kinase and proteins such as myoglobin or troponin in the bloodstream released by injured skeletal muscle cells. The level of these substances correlates with the severity of the injury.

[itsmyluck]

Excellent

[aliotak]

TYSM