CSCS CSCS: Biomechanics of Resistance 4

Question 1

The angle of pennation in a pennate muscle affects force production primarily by influencing which variable?

Accepted Answer

Cross-sectional area contribution to resultant force

Answer

As pennation angle increases, a larger fraction of fiber force is directed along the muscle's line of action, affecting the effective force transmitted to the tendon.

Question 2

During an Olympic clean, the barbell transitions from the first to the second pull. The primary biomechanical change is:

Accepted Answer

Rapid triple extension of ankle, knee, and hip to accelerate the barbell

Answer

The second pull is characterized by explosive triple extension (ankle, knee, hip) to generate maximum barbell velocity before the catch phase.

Question 3

Which factor primarily determines the length of a muscle's moment arm?

Accepted Answer

The perpendicular distance from the muscle's line of action to the joint axis

Answer

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

Question 4

A force of 200 N is applied to a dumbbell 0.3 m from the elbow joint axis. What is the torque produced?

Accepted Answer

60 N·m

Answer

Torque = Force × Moment arm = 200 N × 0.3 m = 60 N·m.

Question 5

In biomechanics, 'impulse' is defined as:

Accepted Answer

Force multiplied by time

Answer

Impulse equals force × time (J = F × Δt) and equals the change in momentum of an object, per the impulse-momentum theorem.

Certified Strength and Conditioning Specialist Practice Test

Certified Strength and Conditioning Specialist Practice Test

CSCS CSCS: Biomechanics of Resistance 4