Pre-Participation Health Screening (Overview)

Exercise is overwhelmingly safe, but the absolute risk of a sudden cardiac event rises transiently during vigorous exertion, especially in people with underlying (often undiagnosed) cardiovascular, metabolic, or renal disease and in the habitually inactive. The purpose of pre-participation screening is to identify that higher-risk minority and refer them for medical clearance before they begin or intensify exercise, while keeping barriers low for the apparently healthy majority.

Two complementary tools dominate practice:

• Self-administered questionnaire — the PAR-Q+ is the international standard for self-screening before community fitness participation.
• Professional algorithm — the ACSM pre-exercise screening algorithm (current since the 2015/2018 update) used by fitness professionals, stratifying on current activity level, known disease/signs/symptoms, and desired intensity.

Screening is not the same as a diagnostic medical exam; it is a triage step. A "yes" that triggers referral means get clearance, not do not exercise. The 2015 ACSM revision deliberately moved away from counting cardiovascular risk factors because that approach over-referred people and discouraged activity; modeling estimated the new algorithm cut referrals by roughly 41%. (referral-reduction figure)

• Goal: triage the higher-risk minority to medical clearance; minimize barriers for the rest.
• Cardiac event risk rises transiently during vigorous exercise, mainly in those with occult disease and the sedentary.
• Standard tools: PAR-Q+ (self) and the ACSM algorithm (professional).
• The current ACSM approach is NOT cardiovascular-risk-factor counting (that was pre-2015); it screens on activity status + disease/signs/symptoms + desired intensity.
• "Refer for clearance" ≠ "do not exercise."

• par-q-plus — the self-screen everyone can complete.
• acsm-screening-algorithm — the professional decision logic.
• medical-clearance — what referral means and when to seek it.
• contraindications-to-testing — when testing itself must be deferred.
• hypertension / diabetes-exercise — conditions that frequently trigger referral.