NSCA CSCS Exercise Science Principles 2

Question 1

Which energy system predominates during a 400-meter sprint performed at maximal effort?

Accepted Answer

Fast glycolysis

Answer

A 400-meter sprint lasting approximately 45–60 seconds relies predominantly on fast glycolysis (anaerobic glycolysis) for ATP production.

Question 2

The Fick equation for oxygen consumption (VO2) is best expressed as:

Accepted Answer

VO2 = HR × SV × (a-vO2 difference)

Answer

The Fick equation states VO2 = cardiac output (HR × SV) multiplied by the arteriovenous oxygen difference (a-vO2 diff).

Question 3

During eccentric muscle contractions, force production relative to maximal isometric force is:

Accepted Answer

Higher

Answer

Eccentric contractions can produce forces 20–60% greater than maximal isometric force due to passive elastic contributions of titin and cross-bridge mechanics.

Question 4

Which muscle fiber type has the highest oxidative capacity and is most resistant to fatigue?

Accepted Answer

Type I

Answer

Type I (slow-twitch) fibers have the highest mitochondrial density, oxidative enzyme activity, and fatigue resistance.

Question 5

The sliding filament theory describes muscle contraction as:

Accepted Answer

Actin filaments sliding over myosin filaments to shorten the sarcomere

Answer

During contraction, actin (thin) filaments slide past myosin (thick) filaments, reducing sarcomere length without the filaments themselves changing length.

NSCA CSCS - NSCA Certified Strength and Conditioning Specialist Practice Test

NSCA CSCS - NSCA Certified Strength and Conditioning Specialist Practice Test

NSCA CSCS Exercise Science Principles 2