ACE Exercise Physiology

Question 1

Which energy system is the PRIMARY source of ATP during a 100-meter sprint?

Accepted Answer

Phosphocreatine (ATP-PC) system

Answer

The ATP-PC (phosphocreatine) system provides immediate, high-power energy for very short, maximal-intensity efforts lasting up to about 10 seconds.

Question 2

What is the term for the maximum amount of oxygen the body can consume per minute during maximal exercise?

Accepted Answer

VO2 max

Answer

VO2 max (maximal oxygen uptake) represents the ceiling of the cardiorespiratory system's ability to deliver and use oxygen during intense exercise.

Question 3

During prolonged, low-intensity exercise, which fuel source becomes increasingly predominant?

Accepted Answer

Fat (free fatty acids)

Answer

At low intensities, the oxidative system has time to metabolize fat (free fatty acids), making fat the dominant fuel source during prolonged, easy-paced activity.

Question 4

Which of the following best describes the 'lactate threshold'?

Accepted Answer

The exercise intensity at which lactate begins to accumulate faster than it can be cleared

Answer

Lactate threshold is the intensity where lactate production exceeds clearance, causing blood lactate to rise rapidly, typically signaling a shift to heavier anaerobic metabolism.

Question 5

The Frank-Starling mechanism states that cardiac output increases because:

Accepted Answer

Greater ventricular filling (preload) leads to a more forceful contraction

Answer

The Frank-Starling mechanism describes how increased end-diastolic volume stretches the ventricles, causing a stronger contraction and greater stroke volume.

ACE - Personal Trainer Exam Practice Test

ACE - Personal Trainer Exam Practice Test

ACE Exercise Physiology