ACE Exercise Physiology 3

Question 1

A client's resting heart rate decreases after 12 weeks of aerobic training. This is primarily due to:

Accepted Answer

Increased parasympathetic nervous system tone

Answer

Decreased stroke volume

Answer

Reduced cardiac muscle size

Answer

Increased sympathetic stimulation at rest

Question 2

Which type of muscle contraction produces the GREATEST amount of force?

Accepted Answer

Eccentric contraction

Answer

Concentric contraction

Answer

Isometric contraction

Answer

Isotonic contraction

Question 3

Which physiological variable best predicts aerobic exercise performance in trained athletes?

Accepted Answer

Lactate threshold as a percentage of VO2 max

Answer

VO2 max alone

Answer

Resting heart rate

Answer

Maximum heart rate

Question 4

What is the primary role of the enzyme creatine kinase (CK) during high-intensity exercise?

Accepted Answer

Catalyzes the transfer of a phosphate from phosphocreatine to ADP to regenerate ATP

Answer

Breaks down fat into free fatty acids

Answer

Converts lactate back into glucose

Answer

Transports oxygen in the bloodstream

Question 5

Which of the following occurs in fast-twitch (Type II) muscle fibers compared to slow-twitch (Type I) fibers?

Accepted Answer

Faster myosin ATPase activity

Answer

Higher mitochondrial density

Answer

Greater fatigue resistance

Answer

Lower glycolytic enzyme concentration

Question 6

During exercise in the heat, blood flow is redistributed to the skin for cooling. This can impair performance primarily by:

Accepted Answer

Reducing blood available to working muscles (cardiovascular drift)

Answer

Increasing stroke volume to working muscles

Answer

Decreasing core body temperature too rapidly

Answer

Elevating blood lactate clearance

Question 7

The ATP produced per mole of glucose via complete aerobic oxidation (glycolysis + Krebs cycle + ETC) is approximately:

Accepted Answer

30–32 ATP

Answer

2 ATP

Answer

4 ATP

Answer

100 ATP