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. 2021 Mar 23;10(3):23. doi: 10.1167/tvst.10.3.23

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Figure 4. — Trends of heart rate and oxygen saturation changes in volunteers during ICRT without a mask, with a surgical mask, and with an N95 mask. The mean heart rates at 3 minutes in groups A′, B′, and C′ were 130.0 ± 7.67, 146.9 ± 10.00, and 153.1 ± 8.05 beats per minute, respectively (all P < 0.05). The mean heart rates at 6 minutes in groups A′, B′, and C′ were 157.2 ± 7.24, 173.3 ± 10.07, and 181.4 ± 6.89 beats per minute, respectively (all P < 0.05). The mean oxygen saturation levels at 3 minutes in groups A′, B′, and C′ were 97.1% ± 0.90%, 96.1% ± 1.04%, and 95.8% ± 1.27%, respectively (groups A′ and B′ vs C′, P < 0.05). The mean oxygen saturation levels at 6 minutes in groups A′, B′, and C′ were 96.8% ± 0.83%, 95.7% ± 0.86%, and 95.0% ± 1.21%, respectively (all P < 0.05).