ACSM-EP Clinical Exercise Testing 3 — Questions and Answers
Question 1: When performing a 6-minute walk test (6MWT) in a patient with heart failure, which outcome measure is most clinically relevant?
- Total distance walked in 6 minutes (Correct answer)
- Average HR during the walk
- Peak RER at test end
- Number of rest breaks taken
Correct answer: Total distance walked in 6 minutes
Total distance walked in 6 minutes is the primary outcome of the 6MWT and correlates with functional capacity and prognosis in heart failure patients.
Question 2: Which ECG finding during exercise most specifically indicates left ventricular volume overload rather than ischemia?
- Horizontal ST depression in V4–V6
- Tall R waves with ST elevation in aVR (Correct answer)
- Deep Q waves in II, III, aVF
- Symmetric T-wave inversions in anterior leads
Correct answer: Tall R waves with ST elevation in aVR
ST elevation in aVR with reciprocal changes can indicate left main or proximal LAD occlusion causing volume/pressure overload, though interpretation requires full clinical context.
Question 3: A clinically obese patient (BMI 41) cannot complete Stage 1 of the Bruce protocol. What is the most appropriate alternative protocol?
- Modified Bruce protocol starting at a lower grade (Correct answer)
- Astrand-Ryhming cycle ergometer test
- Rockport 1-mile walk test
- Wingate anaerobic power test
Correct answer: Modified Bruce protocol starting at a lower grade
The Modified Bruce protocol adds two lower-intensity stages (0% and 5% grade at 1.7 mph) before Stage 1, making it appropriate for deconditioned or obese individuals.
Question 4: During a maximal exercise test, a patient's RER reaches 1.15. What does this indicate?
- The patient is hyperventilating due to anxiety
- Maximal or near-maximal effort has been achieved (Correct answer)
- Fat oxidation is the primary fuel substrate
- The test should be stopped for safety
Correct answer: Maximal or near-maximal effort has been achieved
An RER >1.10 during exercise indicates significant CO2 release from bicarbonate buffering of lactic acid, confirming near-maximal effort.
Question 5: Which blood pressure response during exercise is considered hypertensive and warrants test termination?
- SBP >180 mmHg
- DBP >115 mmHg
- SBP >250 mmHg or DBP >115 mmHg (Correct answer)
- Mean arterial pressure >120 mmHg
Correct answer: SBP >250 mmHg or DBP >115 mmHg
ACSM guidelines recommend stopping the exercise test if SBP exceeds 250 mmHg or DBP exceeds 115 mmHg to prevent hypertensive emergency.
Question 6: The double product (rate pressure product) during a GXT is calculated as:
- HR × systolic BP ÷ 100 (Correct answer)
- HR × mean arterial pressure
- Systolic BP × diastolic BP
- HR × VO2
Correct answer: HR × systolic BP ÷ 100
Rate pressure product = HR × systolic BP, and it correlates with myocardial oxygen demand; it is used to track ischemic thresholds across tests.
Question 7: A patient stops a GXT at Stage 3 of the Bruce protocol (3.4 mph, 14% grade). Using MET tables, his estimated VO2max is approximately:
- 7 METs
- 9 METs
- 11 METs (Correct answer)
- 13 METs
Correct answer: 11 METs
Bruce Stage 3 corresponds to approximately 34.8 mL/kg/min, which is roughly 10–11 METs, depending on body weight and mechanical efficiency.
ACSM-EP Clinical Exercise Testing 3
When performing a 6-minute walk test (6MWT) in a patient with heart failure, which outcome measure is most clinically relevant?