9.3 Patient Monitoring & Supervision During Exercise (telemetry, oximetry, glucometry, ECG)

Supervision is what separates a clinical exercise program from a gym class. Domain IV requires the CEP to actively monitor patients during training using heart rate, blood pressure, RPE, ECG telemetry, pulse oximetry, and blood glucose as clinically indicated, and to recognize the earliest signs that a session needs to be modified or stopped.

Levels of Supervision and Risk Stratification

Not every patient needs the same intensity of oversight. The level of supervision — continuous ECG telemetry, intermittent monitoring, or independent training with periodic check-ins — is set by the patient's risk stratification (established in Chapter 6 and reassessed over time), not by convenience or staffing availability. In cardiac rehabilitation, patients classified as higher risk (for example, significantly reduced ejection fraction, complex ventricular arrhythmia, survived cardiac arrest, or abnormal hemodynamic response to exercise) typically require closer, often continuous, ECG telemetry monitoring in the earlier sessions of the program. As a patient demonstrates stable hemodynamic and rhythm responses across sessions, monitoring commonly transitions from continuous to intermittent or spot-check, freeing continuous telemetry capacity for higher-acuity patients.

The broader ACSM risk classification (Classes A-D) provides the same logic outside of formal cardiac rehab: Class C patients (moderate-to-high cardiac risk, or unable to self-regulate activity) generally need medical supervision with ECG and blood pressure monitoring during initial sessions until safety is established, while Class D patients (unstable conditions with active symptoms) require the most intensive medical oversight and are not yet cleared for standard training. Group supervision, with one CEP directly observing several patients at once, is appropriate for stable, lower-risk patients training together; individual 1:1 supervision is reserved for higher-acuity patients or those newly starting the program.

Core Vital Signs: Heart Rate, Blood Pressure, and RPE

Every supervised session checks the same core parameters at defined points — before exercise, during exercise (periodically through the session), at peak effort, and during recovery:

Two RPE scales are in common clinical use: the original Borg 6-20 scale, where moderate intensity generally falls around RPE 12-14 ("somewhat hard") and the number multiplied by 10 loosely approximates heart rate in beats per minute, and the Category-Ratio (CR10) 0-10 scale, often preferred in pulmonary rehabilitation for rating dyspnea and musculoskeletal discomfort. The talk test (able to talk but not sing comfortably at moderate intensity) is a simple, equipment-free supplementary intensity check, and is particularly useful for patients on medications that blunt the normal heart-rate response, where RPE and the talk test carry more weight than heart rate alone.

Pulse Oximetry

For patients with pulmonary disease or cardiopulmonary comorbidity, SpO2 is monitored continuously or at regular intervals during exertion. Exercise-induced desaturation is generally flagged when SpO2 drops to 88% or below, or falls 4 percentage points or more from the patient's baseline, regardless of the starting value. In COPD specifically, a target range of roughly 88-92% is commonly used rather than the higher saturation targets used in most other populations, reflecting the risk of hypercapnia with over-oxygenation. A desaturation event during a session prompts the CEP to reduce intensity, provide ordered supplemental oxygen, or stop the activity and reassess.

Glucometry for Patients with Diabetes

Blood glucose is checked before exercise for patients with diabetes, and periodically during longer or more vigorous sessions. General guidance:

• Below about 100 mg/dL — a small carbohydrate snack (roughly 15-20 g) before starting reduces hypoglycemia risk
• Roughly 100-250 mg/dL — generally an acceptable range to begin exercise
• Above 250 mg/dL — check for ketones; if ketones are present, avoid vigorous activity, since exercising in this state can worsen hyperglycemia and risk ketoacidosis rather than lower glucose

Because insulin and some oral agents increase hypoglycemia risk during and after exercise, glucose should also be checked during prolonged sessions and the patient counseled on delayed post-exercise hypoglycemia risk, which can occur several hours after training as muscle glycogen is replenished.

Recognizing Adverse Signs During Supervision

Beyond the numbers, the CEP is watching for clinical signs that something is wrong: new or worsening chest, arm, or jaw discomfort; dyspnea clearly disproportionate to the workload; dizziness or lightheadedness; pallor, cold sweat, or diaphoresis; ataxia or sudden confusion; claudication pain limiting further activity; and arrhythmia or ST-segment changes on telemetry. Any of these findings shifts the session from routine monitoring to active intervention — pausing or stopping the activity, reassessing vitals, and escalating per the program's emergency and physician-notification protocols (Chapter 11), while documenting exactly what was observed and how it was handled.