Interpreting & Reporting Results (ECG response, RPP, claudication, Duke Treadmill Score, VO₂/RER/AT)

ACSM Certified Clinical Exercise Physiologist ACSM-CEP

Track your progress as you read

Finished sections get a check mark.

1 Introduction & Exam Overview

1.1 The ACSM-CEP Role, Job Definition & Scope of Practice 1.2 Exam Format, Domain Weights & Scoring 1.3 Eligibility, Study Planning & Test-Day Strategy

2 Applied Exercise Physiology & Metabolic Calculations

Bioenergetics & Energy Systems (ATP-PC, glycolytic, oxidative) Acute Cardiorespiratory & Metabolic Responses to Aerobic Exercise Responses to Resistance Exercise & Chronic Training Adaptations ACSM Metabolic Equations, METs & Interpreting VO₂ / RER / Ventilatory Threshold

3 Pathophysiology of Clinical Populations

3.1 Coronary Artery Disease, Myocardial Infarction & Revascularization (PCI/CABG) 3.2 Heart Failure, Valvular Disease & Cardiac Rhythm Disorders 3.3 Hypertension, Dyslipidemia & Peripheral Artery Disease 3.4 Pulmonary Disease: COPD, Asthma & Restrictive/Interstitial Disorders 3.5 Diabetes, Metabolic Syndrome & Obesity 3.6 Renal Disease & Musculoskeletal/Orthopedic Conditions 3.7 Neuromuscular, Neurological & Cognitive Conditions (stroke, MS, Parkinson's, SCI) 3.8 Neoplastic, Immunologic & Hematologic Disorders (cancer, HIV/AIDS, anemia)

4 Clinical ECG Interpretation

4.1 ECG Leads, Waveforms, Rate & Rhythm Determination 4.2 Arrhythmias & Conduction Blocks 4.3 Ischemia, Injury & Infarction (ST changes, exercise-induced) 4.4 Drug & Electrolyte ECG Effects; Resting/Exercise Monitoring Setup & Lead Placement

5 Pharmacology for the Clinical Exercise Physiologist

5.1 Beta-Blockers, Calcium-Channel Blockers & Nitrates 5.2 RAAS Agents, Diuretics, Antiarrhythmics, Lipid-Lowering & Antithrombotic Drugs 5.3 Bronchodilators, Corticosteroids, Insulin & Oral Antidiabetic Agents 5.4 Medication Effects on HR/BP & Exercise Response; Dose/Meal/Dialysis Timing

6 Patient Assessment (Domain I, 18%)

6.1 Medical Records, HIPAA/HITRUST, Charting & Physician Referral 6.2 Patient Interview, Medical History & Medication Reconciliation 6.3 Resting Vital Signs, Body Composition & Resting ECG 6.4 Preparticipation Health Screening & Level of Monitoring (PAR-Q+, ACSM algorithm, ACC/AHA · GOLD · ADA · AACVPR) 6.5 Assessing Patient Goals, Readiness & Psychosocial Status

7 Clinical Exercise Testing (Domain II, 18%)

Submaximal Aerobic Tests (treadmill, cycle, step, 6-minute walk) Musculoskeletal Fitness, Mobility & Balance Testing Maximal Symptom-Limited GXT: Protocols, Contraindications & ECG Prep Test Termination: Relative & Absolute Indications Interpreting & Reporting Results (ECG response, RPP, claudication, Duke Treadmill Score, VO₂/RER/AT)

8 Exercise Prescription for Clinical Populations (Domain III, 22%)

FITT-VP Principles, Progression & Prescription Foundations Ex Rx for Cardiovascular Disease (CAD, HF, HTN, PAD, post-revascularization) Ex Rx for Pulmonary Disease (COPD, asthma; breathing techniques, supplemental O2) Ex Rx for Diabetes, Metabolic Syndrome & Obesity Ex Rx for Musculoskeletal, Neuromuscular, Neoplastic & Other Conditions Communicating Intensity (THR, RPE, talk test), Monitoring & Modifying the Prescription

9 Exercise Training & Leadership (Domain IV, 24%)

9.1 Discussing the Training Plan, Clinician & Patient Expectations/Goals 9.2 Instructing & Modifying Exercise Modes (cardiorespiratory, strength/endurance, flexibility, coordination, agility) 9.3 Patient Monitoring & Supervision During Exercise (telemetry, oximetry, glucometry, ECG) 9.4 Contraindications to Training & Modifying Recommendations 9.5 Documenting Clinical Status, Reporting Adverse Events & Interdisciplinary Coordination

10 Education & Behavior Change (Domain V, 13%)

10.1 Behavioral-Health Screening & Recognizing Distress (PHQ-9, Beck, SF-36; referral) 10.2 Patient Education, Health Literacy & Disease Self-Management 10.3 Motivational Interviewing & Behavior-Change Theories (Transtheoretical, HBM, Social Cognitive, Five-A's) 10.4 Promoting Adherence, Self-Efficacy, Relapse Prevention & Social Support

11 Legal, Professional & Emergency Management (Domain VI, 5%)

11.1 Emergency Equipment, Crash Cart Inspection & Emergency Procedures 11.2 CPR/AED/BLS/ACLS, Universal Precautions & EMS Activation 11.3 Scope of Practice, Legal/Ethical Standards, Liability/Negligence, Informed Consent & Professional Organizations (ACSM/AACVPR/AHA)

Interpreting & Reporting Results (ECG response, RPP, claudication, Duke Treadmill Score, VO₂/RER/AT)

Key Takeaways Explain This Topic AI

Exercise ECG is read as positive, negative, or non-diagnostic; ischemic ST depression is classically 1 mm or more of horizontal or downsloping depression, but baseline abnormalities like LBBB or a paced rhythm make the test non-diagnostic.

Rate-pressure product (heart rate × systolic BP) estimates myocardial oxygen demand and is used to compare cardiac workload tolerance before and after an intervention.

The Duke Treadmill Score combines exercise time, ST deviation, and an angina index into a single prognostic score, stratifying patients into low, moderate, and high risk.

A respiratory exchange ratio (RER) at or above approximately 1.10 at peak exercise supports that a patient reached true maximal effort during CPET.

The ventilatory (anaerobic) threshold can be identified from submaximal effort, making it a valuable effort-independent fitness marker in patients who cannot be pushed to a true peak.

Last updated: July 2026

Interpreting & Reporting Results: ECG Response, RPP, Claudication, Duke Treadmill Score & VO₂/RER/AT

Once a test is complete, the CEP's job shifts from monitoring to interpretation — turning raw waveforms, vitals, and symptom reports into a clinical picture the referring physician can act on. Several standardized tools structure that interpretation.

ECG Response

An exercise ECG is generally read as positive (ischemic), negative , or equivocal/non-diagnostic . The classic ischemic pattern is horizontal or downsloping ST-segment depression of 1 mm or more, measured 60-80 ms after the J point, in a patient without confounding baseline abnormalities; upsloping depression is a less specific finding. Tests are non-diagnostic in patients with baseline findings that already distort the ST segment — left bundle branch block, a ventricularly paced rhythm, left ventricular hypertrophy with strain, or digoxin effect — because ischemic changes cannot be reliably distinguished from the underlying abnormality.

Rate-Pressure Product (RPP)

RPP = heart rate × systolic blood pressure. RPP is a widely used estimate of myocardial oxygen demand and cardiac workload. Because it reflects the heart's actual demand rather than just external workload, RPP is often used to compare a patient's tolerance before and after an intervention — for example, a lower RPP at the point angina or ischemia appears after starting a beta-blocker or after revascularization reflects reduced myocardial oxygen demand for a given level of exertion, even if the achieved workload (mph, watts) looks similar.

Claudication Grading

For patients tested for suspected or known peripheral artery disease, claudication pain is tracked on a graded scale throughout the test — commonly a 4-point scale progressing from initial onset of mild discomfort, through moderate pain, to pain severe enough that the patient must stop. Claudication severity that reaches this stopping threshold is itself one of the relative indications for test termination covered in the previous section, so claudication grading and termination decisions are directly linked.

Duke Treadmill Score

The Duke Treadmill Score (DTS) combines exercise time on the Bruce protocol, ST-segment deviation, and angina during the test into a single prognostic number:

DTS = Exercise time (minutes) − (5 × maximum ST deviation in mm) − (4 × angina index)

The angina index scores 0 for no angina, 1 for non-limiting angina, and 2 for exercise-limiting angina. Resulting scores stratify risk:

Score Risk category Approximate 5-year survival
≥ +5 Low risk ~97%
−10 to +4 Moderate risk ~90%
≤ −11 High risk Notably lower

The DTS is intended for patients without known coronary artery disease undergoing a standard Bruce-protocol test and should not be applied outside that context.

VO2, RER & Ventilatory (Anaerobic) Threshold

Measured vs. estimated VO2peak. Measured VO2peak, obtained directly from expired-gas analysis (metabolic cart) during cardiopulmonary exercise testing (CPET), is more accurate than VO2 estimated from workload/MET prediction equations, which assume a standard mechanical efficiency that any individual patient may not match.

Confirming maximal effort. Because a literal VO2 plateau despite increasing workload is often not observed clinically, "VO2peak" (the highest value actually achieved) is generally preferred over "VO2max." Supporting evidence of a true maximal or near-maximal effort includes a respiratory exchange ratio (RER) at or above approximately 1.10 at peak exercise, attainment of age-predicted maximal heart rate, and a peak RPE in the 18-19+ range.

Ventilatory (anaerobic) threshold (VT/AT). VT marks the point where ventilation begins increasing disproportionately relative to VO2 as anaerobic metabolism contributes more to energy production and lactate rises. Because it can be identified from a submaximal effort, VT is a valuable, effort-independent marker of aerobic fitness in patients who cannot or should not be pushed to a true peak — including many older, heart-failure, or pulmonary patients.

VE/VCO2 slope. This ventilatory-efficiency measure reflects how much ventilation is required to eliminate a given amount of CO2; values above roughly 30 indicate abnormal ventilation-perfusion matching and are seen in heart failure, pulmonary arterial hypertension, interstitial lung disease, and COPD, carrying prognostic significance in these populations.

Putting It Together

None of these tools is interpreted in isolation. A physician review typically weighs the ECG response, hemodynamic response (including RPP), symptom pattern, and — when available — the DTS or CPET indices together to arrive at a risk classification and next step, whether that's referral for further cardiac workup, clearance for a structured exercise program, or direct input into the FITT-VP prescription decisions covered in Chapter 8.