CSCS Resistance Training Biomechanics 2

Question 1

Which joint action occurs at the hip during the concentric phase of a back squat?

Accepted Answer

Hip extension

Answer

During the concentric (rising) phase of the back squat, the hip extensors (glutes and hamstrings) produce hip extension to return the body to standing.

Question 2

What is the moment arm in a lever system?

Accepted Answer

The perpendicular distance from the axis of rotation to the line of force application

Answer

The moment arm is the perpendicular distance from the joint's axis of rotation to the line of action of the applied force, and it determines the torque generated.

Question 3

During a standing barbell curl, which phase produces an eccentric contraction of the biceps brachii?

Accepted Answer

Lowering the bar back to the starting position

Answer

The biceps brachii lengthens under load during the lowering (eccentric) phase of the curl as elbow extension occurs against gravity.

Question 4

A longer resistance arm in a lever system will:

Accepted Answer

Increase the torque produced by the resistance

Answer

Torque equals force multiplied by its moment arm, so a longer resistance arm increases the torque the resistance creates about the joint.

Question 5

Which type of muscle action produces the greatest force output?

Accepted Answer

Eccentric

Answer

Eccentric muscle actions can produce approximately 20–50% more force than concentric contractions due to passive elastic contributions from titin and connective tissue.

(CSCS) Certified Strength & Conditioning Specialist Practice Test

(CSCS) Certified Strength & Conditioning Specialist Practice Test

CSCS Resistance Training Biomechanics 2