CSC Biomechanics and Movement Analysis

Question 1

What does 'center of mass' (COM) refer to in biomechanical analysis of an athlete?

Accepted Answer

The point where the body's total mass can be considered to be concentrated for movement analysis

Answer

The center of mass is the theoretical point where total body mass is concentrated; its position and movement are central to analyzing balance and stability during exercise.

Question 2

In the squat, which joint angle change most increases compressive force on the patellofemoral joint?

Accepted Answer

Increasing knee flexion beyond 90 degrees

Answer

Patellofemoral compressive forces increase with greater knee flexion angles as the quadriceps pull becomes more mechanical disadvantaged and patella contact area shifts.

Question 3

What is the principle of 'force-velocity relationship' in muscle mechanics?

Accepted Answer

As contraction velocity increases, the maximum force a muscle can produce decreases

Answer

The force-velocity curve demonstrates that peak force production decreases as movement velocity increases — explaining why maximal strength and speed training require different loads.

Question 4

What is 'valgus collapse' of the knee and why is it biomechanically problematic during landing?

Accepted Answer

Inward collapse of the knee medially, increasing ACL strain and patellofemoral stress

Answer

Knee valgus collapse (medial knee displacement) during landing or squatting increases ACL and medial knee structure stress and is a major ACL injury risk factor.

Question 5

What does 'torque' mean in the context of biomechanical joint analysis?

Accepted Answer

The rotational force produced around a joint axis (force × moment arm)

Answer

Torque is the product of force and its perpendicular distance (moment arm) from the axis of rotation; it determines the rotational effect of muscular forces on joints.

CSC - Certified Strength Coach Practice Test

CSC - Certified Strength Coach Practice Test

CSC Biomechanics and Movement Analysis