Communicating Intensity (THR, RPE, talk test), Monitoring & Modifying the Prescription

Communicating Intensity to the Patient

A written or verbal prescription is only useful if the patient can apply it independently between supervised sessions. The CEP teaches three complementary intensity tools:

• Target Heart Rate (THR) range — explained in plain terms (e.g., "keep your pulse between 100 and 115 beats per minute"), calculated from the Karvonen or %HRmax method described in Section 8.1.
• Rating of Perceived Exertion (RPE) — the Borg 6–20 scale or the 0–10 category-ratio (CR10) scale. Patients are anchored to the scale by practicing it during a warm-up bout with the CEP present, so their self-rating during independent exercise is calibrated against a known reference.
• Talk test — a positive talk test (patient can talk in sentences but not sing) corresponds to roughly moderate intensity; a negative talk test (patient is noticeably breathless and cannot maintain a conversation) corresponds to vigorous intensity. It requires no equipment, which makes it especially useful for home and community settings.

The full written prescription also documents warm-up and cool-down instructions, equipment use, and clear stop criteria and warning signs — chest pain or pressure, unusual or sudden shortness of breath, dizziness/lightheadedness, or an irregular or racing heartbeat — with explicit instructions to stop exercise, and to notify the care team or call emergency services if the symptom is severe or does not resolve with rest.

Equipment Instruction and Adverse-Reaction Reporting

Patients are instructed on correct use of any prescribed home equipment and on wearable fitness technology (heart-rate monitors, activity trackers, continuous glucose monitors) that supports self-monitoring between visits. Instruction includes exactly what to do and whom to contact if an adverse reaction or unexpected symptom occurs during a home or community session, closing the loop between the clinical program and independent exercise. For higher-risk patients (recent MI, unstable arrhythmia, poorly controlled diabetes), the CEP typically provides a written action card listing the specific stop criteria for that patient, the phone number for the clinical program, and clear guidance on when a symptom warrants a call to the care team versus activating emergency medical services — the distinction between "call the clinic tomorrow" and "call 911 now" should never be left for the patient to infer in the moment.

Monitoring During Supervised Sessions

Supervised sessions combine several monitoring streams appropriate to the patient's condition: heart rate (palpation, monitor, or telemetry), blood pressure before and immediately after exertion (especially important in hypertension and CAD), RPE checks at regular intervals, pulse oximetry in pulmonary patients, and glucometry in patients with diabetes. The CEP also watches for non-instrumented signs of intolerance — pallor, diaphoresis, ataxic gait, facial grimacing, or new claudication — any of which can signal a problem before it shows up on a monitor.

Evaluating and Modifying the Prescription

The prescription is not static; it is re-evaluated against three inputs:

1. Compliance/adherence — missed sessions and the specific barriers behind them (scheduling, transportation, symptoms, motivation) are addressed directly rather than simply re-issuing the same plan.
2. Signs and symptoms during exercise — an abnormal hemodynamic response requires stopping and escalating. Exertional hypotension (a drop in systolic BP as workload increases) is a red flag requiring immediate session termination and physician notification, as are a hypertensive response (commonly cited around ≥250/115 mmHg), new arrhythmia, angina, or disproportionate dyspnea. These are the same relative and absolute termination indications introduced for maximal graded exercise testing in Chapter 7 — the CEP applies that same judgment continuously during training sessions, not only during a formal test.
3. Physiologic response over time — if RPE at a given workload has decreased across sessions, that is evidence of a genuine training adaptation, and the FITT-VP prescription should be progressed to maintain an adequate stimulus. Conversely, if the patient now reaches symptom limits below the previously prescribed intensity, the prescription is scaled back and the case is reviewed for a possible change in clinical status requiring medical consultation.

Every session's response — vitals, RPE, symptoms, and any modification made — is documented in the medical record and communicated to the referring provider according to program protocol, with immediate notification for any new or worsening symptom. This documentation and communication loop is what allows Domain IV (Exercise Training and Leadership) to build safely on the prescription set in Domain III.