Table 2.

Current Recommendations from ACSM ³⁰ and ACOG. ²⁸ .

	ACOG moderate	ACSM light	ACSM moderate	ACSM vigorous
% Heart rate maximal	Less than 60-80% of age predicted maximal heart rate usually not exceeding 140 bpm	57-63%	64-76%	77-95%
% heart rate reserve	Not applicable	30-39	40-59%	60-89%
Rating of perceived exertion on the Borg scale	12-14 Fairly light to somewhat hard	9-11 Very light to fairly light	12-13 Fairly light to somewhat hard	14-17 Somewhat hard to very hard

Abbreviations: ACOG, American College of Obstetricians and Gynecologists; ACSM, American College of Sports Medicine.

Note The Borg and Linderholm perceived exertion values above correspond as follows: 9 “very light”, 10, 11 “fairly light”, 12, 13 “somewhat hard”, 14, 15 “hard”, 16, 17 “hard”. ⁶²