. Author manuscript; available in PMC: 2015 Jun 23.

Published in final edited form as: J Occup Environ Med. 2014 Mar;56(3):313–318. doi: 10.1097/JOM.0000000000000095

TABLE 3.

Participants With Signs of Heat Strain^*

ACGIH Heat Strain Criteria	n (%)
Core body temperature greater than recommended maximum^†	17 (29)
Sustained^‡ heart rate greater than (180 − age) BPM	24 (43)
Average heart rate greater than 115 BPM	11 (20)
Number of signs of heat strain
0	26 (46)
1	12 (21)
2	15 (27)
3	3(5)

n = 56–58. Core body temperature data were missing for two participants. Heart rate data were missing for four participants.

^†

T_c greater than 101.3°F for acclimatized employees or greater than 100.4°F for unacclimatized employees.

^‡

Values sustained for greater than or equal to 5 continuous minutes.

ACGIH, American Conference of Governmental Industrial Hygienists; BPM, beats per minute.