1. Whisker plot of expiratory pressure-time product: Direct comparison of expiratory pressure-time product (PTPEXP) in face mask versus helmet in all tested situations.
Whisker plot of expiratory pressure-time product: Direct comparison of expiratory pressure-time product (PTPEXP) in face mask versus helmet in all tested situations. A very low cycling of 10% shows a large additional expiratory pressure load. Raising cycling criteria slightly already shows a large effect; this effect of diminishing expiratory pressure load continues until 40% (helmet) or 50% (face mask), respectively, where the least additional pressure load can be seen. The lowest values correlate closely with expiratory cycle latency (see Fig. 2).
Onnen Moerer et al. Respir Care 2016;61:15-22
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