ACSM Exercise Science 5 — Questions and Answers
Question 1: Which assessment is used to estimate cardiorespiratory fitness without maximal exertion and is based on heart rate response?
- Rockport Walk Test
- Margaria-Kalamen Step Test
- YMCA Submaximal Cycle Ergometer Test (Correct answer)
- Wingate Anaerobic Test
Correct answer: YMCA Submaximal Cycle Ergometer Test
The YMCA Submaximal Cycle Ergometer Test estimates VO2max by extrapolating the linear heart rate-workload relationship to predicted maximal heart rate.
Question 2: What is the primary fuel source during low-intensity, prolonged exercise (e.g., 30–50% VO2max)?
- Muscle glycogen
- Blood glucose
- Free fatty acids (Correct answer)
- Phosphocreatine
Correct answer: Free fatty acids
At low intensities, the aerobic system relies predominantly on free fatty acid oxidation, sparing glycogen for higher-intensity demands.
Question 3: What is the Frank-Starling mechanism and its significance in exercise physiology?
- Arterial vasoconstriction reduces afterload during exercise
- Increased venous return stretches the ventricle, increasing stroke volume (Correct answer)
- Heart rate increases with sympathetic stimulation
- Oxygen extraction increases at the muscle level
Correct answer: Increased venous return stretches the ventricle, increasing stroke volume
The Frank-Starling mechanism describes how increased venous return during exercise stretches ventricular walls, enhancing contractility and stroke volume.
Question 4: Which type of stretching is most recommended for improving flexibility and is generally considered the safest for most populations?
- Ballistic stretching
- PNF stretching
- Static stretching (Correct answer)
- Dynamic stretching
Correct answer: Static stretching
Static stretching, involving holding a position for 15–60 seconds, is widely recommended for improving flexibility with a low injury risk profile.
Question 5: During high-intensity interval training (HIIT), which metabolic byproduct is primarily responsible for the burning sensation in muscles?
- Carbon dioxide
- Lactic acid accumulation and hydrogen ion production (Correct answer)
- Free radical generation
- Ammonia from protein catabolism
Correct answer: Lactic acid accumulation and hydrogen ion production
The burning sensation during intense exercise is caused by hydrogen ion accumulation (from lactate production), which decreases muscle pH and impairs contraction.
Question 6: What is the recommended minimum number of days per week of moderate-intensity aerobic exercise for substantial health benefits according to ACSM guidelines?
- 2 days/week
- 3 days/week
- 5 days/week (Correct answer)
- 7 days/week
Correct answer: 5 days/week
ACSM recommends ≥5 days/week of moderate-intensity aerobic activity, or ≥3 days/week of vigorous-intensity activity, for substantial health benefits.
Question 7: Which variable is calculated by multiplying heart rate by stroke volume?
- Oxygen pulse
- Mean arterial pressure
- Cardiac output (Correct answer)
- Rate pressure product
Correct answer: Cardiac output
Cardiac output (Q) = heart rate (HR) × stroke volume (SV), representing the total volume of blood ejected by the heart per minute.
ACSM Exercise Science 5
Which assessment is used to estimate cardiorespiratory fitness without maximal exertion and is based on heart rate response?