SCS Exercise Physiology & Biomechanics 5

Question 1

Which concept describes the MINIMUM training stimulus required to produce a physiological adaptation?

Accepted Answer

Threshold principle

Answer

The threshold principle states that training intensity must exceed a minimum level to elicit adaptation; below this threshold, no meaningful physiological change occurs.

Question 2

During a bilateral squat, peak knee joint moment is GREATEST at which point in the descent?

Accepted Answer

At approximately 90° of knee flexion

Answer

Knee extensor moment peaks near 90° of knee flexion where the moment arm of body weight relative to the knee joint is longest.

Question 3

The Fick equation calculates VO2 as the product of cardiac output and which other variable?

Accepted Answer

Arteriovenous oxygen difference (a-vO2 diff)

Answer

The Fick equation: VO2 = Q × (CaO2 − CvO2), where the a-vO2 difference represents oxygen extraction by the working tissues.

Question 4

Which training method BEST improves the rate of force development (RFD) in athletes?

Accepted Answer

Ballistic and plyometric training

Answer

Ballistic movements and plyometrics train the nervous system to recruit motor units rapidly, directly improving RFD which is critical for sport performance.

Question 5

Increased muscle temperature during warm-up enhances performance PRIMARILY by:

Accepted Answer

Improving actin-myosin cross-bridge cycling speed and enzyme activity

Answer

Elevated muscle temperature speeds enzyme kinetics, cross-bridge detachment rates, and nerve conduction velocity, improving mechanical efficiency and power output.

(SCS) Sports Conditioning Specialist Certification Practice Test

(SCS) Sports Conditioning Specialist Certification Practice Test

SCS Exercise Physiology & Biomechanics 5