Fitness Lessons Exercise Physiology Basics 1 — Questions and Answers
Question 1: What is the primary energy system used during short bursts of high-intensity exercise lasting under 10 seconds?
- Phosphocreatine (ATP-PC) system (Correct answer)
- Glycolytic system
- Oxidative system
- Lactic acid system
Correct answer: Phosphocreatine (ATP-PC) system
The phosphocreatine (ATP-PC) system provides immediate energy for activities lasting fewer than 10 seconds.
Question 2: Which term describes the increase in muscle size resulting from resistance training?
- Hypertrophy (Correct answer)
- Atrophy
- Hyperplasia
- Catabolism
Correct answer: Hypertrophy
Hypertrophy is the enlargement of muscle fibers caused by progressive resistance training.
Question 3: What does VO2 max measure?
- Maximum oxygen uptake during exercise (Correct answer)
- Maximum heart rate
- Resting metabolic rate
- Blood lactate concentration
Correct answer: Maximum oxygen uptake during exercise
VO2 max is the maximum rate at which the body can consume oxygen during intense exercise.
Question 4: Which muscle fiber type is most resistant to fatigue?
- Type I (slow-twitch) (Correct answer)
- Type IIa (fast-twitch oxidative)
- Type IIx (fast-twitch glycolytic)
- Type IIb (fast glycolytic)
Correct answer: Type I (slow-twitch)
Type I slow-twitch fibers are highly oxidative and fatigue-resistant, making them ideal for endurance activities.
Question 5: What happens to heart rate during aerobic exercise?
- It increases to deliver more oxygenated blood to muscles (Correct answer)
- It decreases to conserve energy
- It stays the same as at rest
- It fluctuates randomly
Correct answer: It increases to deliver more oxygenated blood to muscles
Heart rate rises during aerobic exercise to pump more oxygenated blood to working muscles.
Question 6: Which of the following best describes the 'lactate threshold'?
- The exercise intensity at which lactate accumulates faster than it can be cleared (Correct answer)
- The point at which muscles stop producing energy
- The maximum heart rate achievable
- The level of oxygen saturation in the blood
Correct answer: The exercise intensity at which lactate accumulates faster than it can be cleared
The lactate threshold is the exercise intensity beyond which lactate builds up in the blood faster than it is removed.
Fitness Lessons Exercise Physiology Basics 1
What is the primary energy system used during short bursts of high-intensity exercise lasting under 10 seconds?