NSCA CSCS Exercise Science Principles 3

Question 1

Cardiac hypertrophy induced by endurance training is primarily characterized by:

Accepted Answer

Increased left ventricular chamber volume with proportional wall thickness (eccentric hypertrophy)

Answer

Chronic endurance training produces eccentric (volume-load) hypertrophy — an enlarged LV cavity with a proportionally larger stroke volume.

Question 2

Which hormone is primarily responsible for acute increases in blood glucose during high-intensity exercise?

Accepted Answer

Epinephrine

Answer

Epinephrine (adrenaline) released from the adrenal medulla stimulates hepatic glycogenolysis to rapidly elevate blood glucose during intense exercise.

Question 3

The primary role of calcium (Ca²⁺) in muscle contraction is to:

Accepted Answer

Bind to troponin C, moving tropomyosin to expose actin binding sites

Answer

Ca²⁺ released from the sarcoplasmic reticulum binds troponin C, causing a conformational shift in tropomyosin that exposes myosin-binding sites on actin.

Question 4

The respiratory exchange ratio (RER) value of 0.70 indicates that the primary fuel source is:

Accepted Answer

Fat

Answer

An RER of 0.70 reflects complete fat oxidation (CO2 produced / O2 consumed = 0.70), consistent with lipid metabolism.

Question 5

Which principle explains why a heavier object requires greater muscular force to accelerate at the same rate as a lighter object?

Accepted Answer

Newton's Second Law (F = ma)

Answer

Newton's Second Law (F = ma) states force equals mass times acceleration, so greater mass requires proportionally greater force for the same acceleration.

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 3