Exercise Science Flashcards
7 cards from real ACSM practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Exercise Science flashcards as text
Which energy system predominates during a 400-meter sprint lasting approximately 50-60 seconds?
Answer: Anaerobic glycolysis
Anaerobic glycolysis is the primary energy system for high-intensity efforts lasting 30–120 seconds, such as a 400-meter sprint.
What is the primary role of the Golgi tendon organ (GTO) during muscle contraction?
Answer: Inhibit excessive muscle tension
The GTO detects high tension in tendons and triggers autogenic inhibition to protect muscles and tendons from excessive force.
During aerobic exercise, what happens to arteriovenous oxygen difference (a-vO2 diff) as intensity increases?
Answer: It increases
As exercise intensity increases, working muscles extract more oxygen, widening the a-vO2 difference.
Which muscle fiber type has the highest oxidative capacity and is most resistant to fatigue?
Answer: Type I
Type I (slow-twitch) fibers are densely packed with mitochondria and myoglobin, making them highly oxidative and fatigue-resistant.
What is the typical respiratory exchange ratio (RER) value that indicates predominant fat oxidation at rest?
Answer: 0.70
An RER of approximately 0.70 indicates that fat is the primary fuel source, reflecting the VCO2/VO2 ratio of fatty acid oxidation.
Which of the following best describes the force-velocity relationship in skeletal muscle?
Answer: As contraction velocity increases, force production decreases
The force-velocity relationship shows an inverse relationship: as shortening velocity increases, the maximum force a muscle can produce decreases.
Which cardiac adaptation is most associated with chronic endurance training?
Answer: Increased left ventricular end-diastolic volume
Endurance training causes eccentric hypertrophy, increasing left ventricular chamber volume and stroke volume at rest and during exercise.