Table 3.

Temperatures of subjects over the course of 1 hour of treadmill exercise at ambient conditions of 35°C and relative humidity 50%

Parameters	Control	N95 FFR	P100 FFR
Rectal temperature (°C)
0 min	37.16 ± 0.39	37.15 ± 0.34	37.10 ± 0.30
20 min	37.42 ± 0.34	37.29 ± 0.35	37.34 ± 0.34
40 min	37.63 ± 0.38	37.50 ± 0.30	37.55 ± 0.33
60 min	37.76 ± 0.39	37.64 ± 0.31	37.70 ± 0.33
Mean skin temperature (°C)
0 min	26.3 ± 1.7	26.6 ± 1.5	26.7 ± 2.5
20 min	30.9 ± 0.8	31.2 ± 0.9	31.1 ± 1.5
40 min	33.3 ± 0.5	33.5 ± 0.4	33.3 ± 0.8
60 min	34.3 ± 0.3	34.4 ± 0.3	34.3 ± 0.4
Facial skin temperature under a respirator (°C)
0 min	32.9 ± 1.2	33.7 ± 1.0	33.8 ± 0.8∗
20 min	34.7 ± 0.9	35.3 ± 0.4∗	35.3 ± 0.4∗
40 min	34.6 ± 0.9	35.3 ± 0.5∗	35.4 ± 0.6∗
60 min	34.8 ± 0.7	35.0 ± 0.7	35.1 ± 0.8

NOTE. Values are mean ± SD.

FFR, filtering facepiece respirator.

^∗Significantly different from controls (P < .05).