RPE

RPE is an acronym used in several fields. The two most common meanings are Rating of Perceived Exertion, a subjective measure of exercise intensity, and Respiratory Protective Equipment, devices worn to reduce inhalation hazards. Context determines which meaning applies.

Rating of Perceived Exertion (RPE), developed by Gunnar Borg in the 1960s, uses numerical scales such as the 6–20 Borg scale or the 0–10 scale for breathlessness. On the 6–20 scale, roughly, multiplying the number by 10 gives an approximate heart-rate level during steady exercise. Categories run from light (about 9–11) to maximum effort (around 19–20). RPE is commonly used to prescribe and regulate exercise intensity, track progress, and guide training in healthy individuals and clinical populations. As a subjective measure, RPE can be influenced by mood, environment, motivation, and experience; it is most reliable when used alongside objective measures like heart rate or power output.

Respiratory Protective Equipment (RPE) includes filtering facepiece respirators (for example disposable N95s), elastomeric respirators, powered air-purifying respirators (PAPRs), supplied-air respirators, and self-contained breathing apparatus. RPE protects against particulate matter, gases, vapors, or infectious agents. Selection depends on the hazard, concentration, exposure duration, and fit. Programs typically require fit testing, medical clearance, training, and regular maintenance. Standards and approvals come from bodies such as NIOSH and OSHA in the United States, with equivalent bodies in other regions. Even with proper equipment, RPE has limitations and must be used with engineering controls and administrative measures; user seal checks, proper donning and doffing, storage, and replacement of filters are essential.

Other uses of the acronym exist in specialized fields, but the two meanings above are the most widely recognized.