SCS Exercise Physiology & Biomechanics 2

Question 1

Which energy system is the PRIMARY contributor during a 400-meter sprint?

Accepted Answer

Glycolytic system

Answer

The glycolytic (lactic acid) system dominates during high-intensity efforts lasting approximately 30–120 seconds, such as a 400m sprint.

Question 2

What does the term 'excess post-exercise oxygen consumption' (EPOC) primarily reflect?

Accepted Answer

Elevated oxygen uptake after exercise to restore homeostasis

Answer

EPOC represents the elevated oxygen uptake following exercise used to replenish phosphocreatine, clear lactate, restore body temperature, and re-oxygenate blood.

Question 3

The sliding filament theory describes muscle contraction through the interaction of which two proteins?

Accepted Answer

Actin and myosin

Answer

Actin (thin filament) and myosin (thick filament) form cross-bridges that produce the force generating muscle shortening.

Question 4

Which type of muscle fiber has the HIGHEST oxidative capacity and fatigue resistance?

Accepted Answer

Type I

Answer

Type I (slow-twitch) fibers contain abundant mitochondria and myoglobin, giving them superior oxidative capacity and resistance to fatigue.

Question 5

During downhill running, which joint action at the knee is MOST responsible for eccentric muscle loading?

Accepted Answer

Knee flexion

Answer

The quadriceps contract eccentrically to control knee flexion during the loading phase of downhill running, absorbing ground reaction forces.

(SCS) Sports Conditioning Specialist Certification Practice Test

(SCS) Sports Conditioning Specialist Certification Practice Test

SCS Exercise Physiology & Biomechanics 2