Before the first rep, know the client's risks. A systematic screening process protects clients, guides program design, and keeps trainers operating within their professional scope.
← Back to Chapter 5 HubPhysical activity reduces risk for cardiovascular, pulmonary, and metabolic diseases, certain cancers, anxiety, and premature death. Yet some exercise-related risk exists, and trainers must understand who is at greatest risk and why.
Highest-Risk Profile: Individuals with underlying cardiovascular disease (CVD) who perform unaccustomed vigorous physical activity are at the greatest risk for activity-associated acute myocardial infarction (AMI) and sudden cardiac death (SCD). The risk is highest when the activity level far exceeds what they are accustomed to.
Moderate exercise does not provoke dangerous cardiovascular or musculoskeletal events in healthy, asymptomatic individuals. The overall risk of an adverse event during vigorous exercise is extremely low for healthy adults.
As individuals become more physically active, their exercise-related cardiovascular risks decline. Unnecessary screening barriers that prevent people from becoming active are themselves a public health risk.
Three ACSM Risk Modulators — the most important factors that determine exercise-related cardiovascular risk:
The ACSM preparticipation health-screening algorithm (Figure 5-1) provides clear decision pathways based on two variables: the client's current exercise status and their disease/symptom profile.
Definition — Regular Exercise: Performing planned, structured physical activity for at least 30 minutes at moderate intensity on at least 3 days/week for at least the past 3 months.
| Exercise Status | No Disease, No Symptoms | Known Disease, Asymptomatic | Any Signs or Symptoms |
|---|---|---|---|
| Does NOT participate in regular exercise | Medical clearance NOT necessary.
May begin light to moderate intensity. Gradually progress following ACSM Guidelines. | Medical clearance recommended before vigorous exercise.
Light to moderate intensity permitted following clearance. | Medical clearance recommended regardless of disease status.
Discontinue exercise if symptoms appear. Light to moderate following clearance. |
| Participates in regular exercise | Continue moderate to vigorous intensity.
Gradually progress as tolerated following ACSM Guidelines. | Continue moderate intensity without clearance.
Medical clearance recommended before progressing to vigorous. | Discontinue exercise. Seek medical clearance.
May return following clearance and gradually progress. |
ACSM Intensity Definitions:
The following nine signs and symptoms — whether at rest or during activity — suggest possible cardiovascular, metabolic, or renal disease and always warrant medical evaluation before or during exercise.
Pain, discomfort in chest, neck, jaw, arms, or other areas that may result from myocardial ischemia.
Shortness of breath at rest or with mild exertion, beyond what is expected for the activity level.
Dizziness or fainting, most commonly caused by reduced perfusion to the brain.
Dyspnea in a reclined position (orthopnea), or paroxysmal nocturnal dyspnea — onset usually 2–5 hours after lying down.
Swelling of the ankles; may indicate cardiac or circulatory dysfunction.
Unpleasant awareness of a forceful, rapid, or irregular heartbeat.
Burning or cramping in the lower extremities during exercise caused by inadequate blood supply.
Any previously identified heart murmur warrants follow-up before vigorous exercise.
Unusual fatigue or shortness of breath with usual daily activities — disproportionate to the task.
Figure 5-2 presents the exercise preparticipation health-screening questionnaire for exercise professionals — a simple, time-efficient 3-step process used at point of service.
Ask whether the client experiences any of the following:
If any symptoms are marked — the client must seek medical clearance before exercise. They may need a facility with medically qualified staff.
Has the client performed planned, structured physical activity for at least 30 minutes at moderate intensity on at least 3 days per week for at least the past 3 months? Answer Yes or No, then continue to Step 3.
Has the client had or do they currently have any of the following?
Evaluating Steps 2 & 3:
ACE ABC Approach in Action — Nathaniel: Nathaniel has diabetes and hasn't seen his doctor in over a year. Using the ACE ABC Approach (Ask, Break Down Barriers, Collaborate), the trainer gathers health history through open-ended questions, identifies the need for medical clearance without dampening enthusiasm, and collaborates with Nathaniel on a plan: contact his doctor this week, keep walking twice a week, and start training once clearance is received. Medical clearance should be framed as ensuring the best possible experience — never as a barrier to being active.
The PAR-Q+ is the standard self-guided screening tool. It has been redesigned to reduce unnecessary barriers to physical activity while still identifying individuals who need further evaluation.
PAR-Q+ Validity & Key Notes:
Trainers working with clients with known CVD in clinical settings require a more comprehensive screening approach than the standard tools. The standard ACSM preparticipation tools are designed for general fitness settings.
Use AACVPR Risk Stratification: Personal trainers in cardiac rehabilitation and medical fitness facilities should use the risk-stratification criteria from the American Association of Cardiovascular and Pulmonary Rehabilitation (AACVPR) — a more in-depth screening tool than the standard ACSM preparticipation tools.
It is imperative that the client's personal physician be made aware of any signs or symptoms suggestive of coronary artery disease discovered during preparticipation screening or during ongoing exercise sessions.
Beyond preparticipation screening, several essential forms must be reviewed, kept accessible, and utilized appropriately. These protect both the client and the trainer, and must be reviewed by a legal professional in your jurisdiction.
Acknowledges the client's understanding of the nature of the exercise program and their voluntary participation. Fundamental liability document.
Explains the risks associated with exercise participation. The client acknowledges these risks and consents to participate. Must be reviewed by a legal professional for your jurisdiction.
Collects comprehensive information beyond the preparticipation screen:
Sent to the client's physician. Provides the trainer with the client's medical information and specifies physical-activity limitations or guidelines. Any deviation from the physician's guidelines must be physician-approved.
Legal Best Practice: All forms used in a personal training practice should be reviewed by a legal professional in your area. Protecting your clients and yourself from exercise-related risks is a prudent and necessary part of operating as a personal trainer.
Many substances and prescription drugs affect the heart's response to exercise. Trainers must understand these effects when designing programs and monitoring intensity. Drug responses are dose-dependent — the larger the dose, the greater the response. If a trainer has concerns about a client's medications, they must discuss them with the client and their physician.
| Drug Category | Resting HR | Exercise HR | VO₂max / Performance | Key Notes for Trainers |
|---|---|---|---|---|
| Beta Blockers | ↓ | ↓ | ↓ (dose-related) | Do NOT use target HR for intensity. Use RPE or talk test instead. |
| Calcium Channel Blockers | ↓ or → | ↓ or → | → | Effect depends on specific agent. Individual responses vary. |
| ACE Inhibitors | → | → | → | No HR effect; BP decreases at rest and during exercise. |
| ARBs (Angiotensin II Receptor Blockers) | → | → | → | Well tolerated; do not adversely affect blood lipids or cause rebound hypertension. |
| Diuretics | → | → | → | Risk of electrolyte imbalance and cardiac arrhythmias. Monitor hydration — especially in heat. |
| Antihistamines | ↑ or ↓ | ↑ or ↓ | ↑ performance/endurance | May cause drowsiness and drying effect in upper airways. |
| Antidepressants / Antianxiety | ↑ or ↓ | ↑ or ↓ | → | Variable effects — confirm with client/physician. |
| Stimulants | ↑ | ↑ | ↓ endurance/performance | Include ADHD medications, some decongestants. |
| Caffeine | ↑ | ↑ | ↑ endurance | Ergogenic at moderate doses; individual tolerance varies widely. |
| Bronchodilators | → | → | ↑ (in COPD/asthma) | Minimal HR/BP effect in healthy individuals; significantly improve exercise capacity in those with airway obstruction. |
| Alcohol | variable | variable | ↓ VO₂max | Exercise prohibited while under the influence. Impairs coordination and increases injury risk. |
| Nicotine Replacement | ↑ | ↑ | → | Patches/gum — HR elevated at rest; monitor cardiovascular response. |
| NSAIDs | → | → | ↓ performance (possible) | Anti-inflammatories (ibuprofen, naproxen). May mask pain — be cautious with exercise intensity. |
Block adrenergic receptors → limit sympathetic nervous system stimulation → reduce resting, exercise, and max HR. Critical: use RPE or talk test — never target heart rate — to prescribe intensity for clients on beta blockers.
Prevent calcium-dependent smooth muscle contraction in arteries → dilation → lower BP. Also used for angina and dysrhythmias. HR effect varies by specific agent (may decrease or have no effect).
Block the enzyme that produces angiotensin II (a potent vasoconstrictor) → vessels dilate → BP decreases. No significant effect on HR. BP will be lower both at rest and during exercise.
Newer class — selective for angiotensin II type 1 receptor. Well tolerated. Do not adversely affect blood lipid profiles or cause rebound hypertension after discontinuation.
Increase water excretion via kidneys. Used for hypertension and congestive heart failure. No direct HR effect, but electrolyte imbalances can cause dangerous arrhythmias. Dehydration risk is significant — especially in warm/humid environments.
Relax and open air passages in the lungs. Primarily stimulate the sympathetic nervous system. Increase exercise capacity in persons with bronchoconstriction but have minimal effect on resting and exercise HR/BP in healthy individuals.
Mimic sympathetic nervous system activity → increase BP and HR at rest and during exercise. Decongestants cause vasoconstriction in upper airways, reducing tissue volume and increasing air space.
Block histamine receptors — no direct HR/BP effect, but cause drying in upper airways and may cause drowsiness. Most cold medications combine decongestants and antihistamines; at low doses, minimal effect on exercise capacity.
Risk is real but manageable. Exercise-related AMI and SCD occur primarily in those with underlying CVD doing unaccustomed vigorous activity. Moderate exercise is safe for the vast majority of people.
Three ACSM risk modulators guide the entire screening framework: current activity level, presence of diagnosed disease or symptoms, and desired exercise intensity.
The ACSM algorithm has two pathways (exercising vs. not) × three conditions (no disease/no symptoms, known disease asymptomatic, any symptoms). Symptoms always require stopping and referring — regardless of disease status or current activity level.
The 3-step checklist for exercise professionals screens symptoms first (Step 1 — any yes = STOP), then activity level (Step 2), then medical conditions (Step 3). The combination of Steps 2 & 3 determines clearance needs.
PAR-Q+ is the standard self-guided screening tool. Valid for 12 months; becomes invalid if health status changes. Any yes on the general health questions triggers follow-up pages; any yes on follow-ups triggers ePARmed-X+ at eparmedx.com.
Medical clearance is not a barrier — it is client advocacy. Frame it as ensuring the safest, most effective exercise experience possible. Use the ACE ABC Approach (Ask, Break Down Barriers, Collaborate) to maintain client enthusiasm throughout the process.
Comprehensive forms — lifestyle questionnaire, medical release, agreement to participate, informed consent — protect both client and trainer. All forms should be reviewed by a local legal professional.
Beta blockers blunt heart rate response — never use target heart rate to prescribe exercise intensity for clients on these medications. Use RPE (Rating of Perceived Exertion) or the talk test instead.
Diuretics and electrolytes: clients on diuretics are at risk of dehydration and dangerous cardiac arrhythmias from electrolyte imbalances. Ensure adequate hydration before, during, and after every session.
Drug effects are dose-dependent and time-sensitive. The larger the dose and the more recently it was taken, the greater the pharmacological effect on exercise response. Always ask when a client last took their medication.