CSCS Resistance Training Biomechanics 5

Question 1

A muscle with a high physiological cross-sectional area (PCSA) is best suited for:

Accepted Answer

Generating high force output

Answer

PCSA is directly proportional to maximal force-producing capacity; muscles with greater PCSA can generate more force regardless of fiber length or pennation.

Question 2

Which of the following best describes 'valgus collapse' at the knee during a squat and its biomechanical implication?

Accepted Answer

The knee caves medially, increasing valgus torque and stress on the medial knee structures and ACL

Answer

Knee valgus collapse (medial knee displacement) increases frontal-plane valgus torque, placing harmful stress on the ACL, MCL, and medial compartment of the knee.

Question 3

Which variable most directly determines the mechanical work performed during a resistance exercise set?

Accepted Answer

Force applied multiplied by the displacement of the load

Answer

Mechanical work equals force multiplied by displacement (W = F × d); in lifting, this reflects the load moved and the distance it travels.

Question 4

In a Romanian deadlift (RDL), compared to a conventional deadlift, the hamstrings experience greater mechanical stimulus primarily because:

Accepted Answer

The hip hinge in the RDL creates a larger moment arm for the hamstrings and allows greater hip flexion under load

Answer

The RDL maintains minimal knee bend and emphasizes hip hinging, placing the hamstrings under a large moment arm and stretching them under significant load.

Question 5

Which principle explains why an athlete can generate more force at the beginning of a concentric contraction after a brief pause (vs. from a static start with no stretch)?

Accepted Answer

Stretch reflex and elastic energy utilization from the SSC

Answer

A controlled eccentric pre-stretch activates the stretch-shortening cycle, utilizing stored elastic energy in tendons and the myotatic reflex to boost subsequent concentric force.

(CSCS) Certified Strength & Conditioning Specialist Practice Test

(CSCS) Certified Strength & Conditioning Specialist Practice Test

CSCS Resistance Training Biomechanics 5