CSCS Technology & Digital Tools 3

Question 1

When an athlete performs a countermovement jump (CMJ) on a force plate, the device primarily records:

Accepted Answer

Ground reaction forces, from which jump height and power can be derived

Answer

Force plates measure vertical (and horizontal) ground reaction forces over time, enabling calculation of impulse, jump height, power, and rate of force development.

Question 2

The reactive strength index (RSI) is calculated as:

Accepted Answer

Jump height divided by ground contact time

Answer

RSI = jump height / ground contact time, quantifying an athlete's ability to rapidly absorb and redirect force during stretch-shortening cycle tasks like drop jumps.

Question 3

Electromyography (EMG) in sport science primarily quantifies:

Accepted Answer

Electrical activity generated by contracting skeletal muscle

Answer

EMG detects the electrical signals produced by motor unit activation in muscle, enabling assessment of muscle onset timing, activation level, and fatigue.

Question 4

A 3D motion capture system using retroreflective markers is primarily used to obtain:

Accepted Answer

Three-dimensional kinematics of body segments and joint angles

Answer

Retroreflective marker-based systems (e.g., Vicon, Motion Analysis) track marker positions in 3D space to calculate joint angles, segment velocities, and movement patterns.

Question 5

Which force plate variable is widely considered the most sensitive indicator of acute neuromuscular fatigue?

Accepted Answer

Rate of force development (RFD) or CMJ flight time

Answer

RFD and CMJ flight time are highly sensitive to neuromuscular fatigue because explosive force expression declines before peak force is noticeably affected.

Certified Strength and Conditioning Specialist Practice Test

Certified Strength and Conditioning Specialist Practice Test

CSCS Technology & Digital Tools 3