ACE Exercise Science & Application 2

Question 1

Which energy system is the PRIMARY source during a 400-meter sprint?

Accepted Answer

Glycolytic system

Answer

The glycolytic system dominates efforts lasting roughly 30–120 seconds, such as a 400-meter sprint.

Question 2

The sliding filament theory describes how muscle contraction occurs when:

Accepted Answer

Myosin heads pull actin filaments toward the M-line

Answer

Cross-bridges form when myosin heads attach to actin and pull actin toward the center of the sarcomere (M-line), shortening the muscle.

Question 3

Which of the following BEST describes the Fick equation for oxygen consumption?

Accepted Answer

VO2 = HR × SV × (a-vO2 difference)

Answer

The Fick equation states VO2 = cardiac output (HR × SV) multiplied by the arteriovenous oxygen difference.

Question 4

A client's respiratory exchange ratio (RER) is 0.85. This MOST likely indicates they are primarily using:

Accepted Answer

An equal mix of carbohydrate and fat

Answer

An RER of 0.85 falls between the pure-fat value (~0.70) and pure-carbohydrate value (1.00), indicating a mixed substrate blend.

Question 5

Which muscle action occurs when the biceps brachii lengthens while producing force during the lowering phase of a curl?

Accepted Answer

Eccentric

Answer

Eccentric contractions occur when a muscle produces force while lengthening, as when controlling the lowering of a weight.

(ACE) American Council on Exercise Certified Practice Test