Table 5.

Respirator microclimate (dead space) parameters over 1 hour of treadmill exercise at ambient conditions of 35°C and relative humidity 50%

Parameters	N95 FFR	P100 FFR
Microclimate temperature (°C)
0 min	31.8 ± 2.1	31.2 ± 1.9
20 min	35.0 ± 0.4	34.7 ± 0.8
40 min	35.0 ± 0.6	34.9 ± 0.5
60 min	35.0 ± 1.0	35.1 ± 0.8
Microclimate relative humidity (%)
0 min	56.0 ± 12.8	62.5 ± 9.6
20 min	76.0 ± 14.7	81.2 ± 8.4
40 min	79.2 ± 15.2	86.3 ± 7.5
60 min	82.8 ± 16.6	89.9 ± 5.6

NOTE. Values are mean ± SD. There was no significant difference in FFR moisture retention after 1 hour of treadmill exercise (N95 FFR = 4.13 ± 3.05 g, P100 FFR = 5.45 ± 4.31; P = .44).

FFR, filtering facepiece respirator.