Alsaad Hayder, Schälte Gereon, Schneeweiß Mario, Becher Lia, Pollack Moritz, Gena Amayu Wakoya, Schweiker Marcel, Hartmann Maria, Voelker Conrad, Rossaint Rolf, Irrgang Matthias
Department of Building Physics, Faculty of Civil Engineering, Bauhaus-University Weimar, 99423 Weimar, Germany.
Department of Anesthesiology, Medical Faculty, University Hospital RWTH Aachen, 52074 Aachen, Germany.
J Clin Med. 2023 Feb 6;12(4):1300. doi: 10.3390/jcm12041300.
Physical exercise demonstrates a special case of aerosol emission due to its associated elevated breathing rate. This can lead to a faster spread of airborne viruses and respiratory diseases. Therefore, this study investigates cross-infection risk during training. Twelve human subjects exercised on a cycle ergometer under three mask scenarios: no mask, surgical mask, and FFP2 mask. The emitted aerosols were measured in a grey room with a measurement setup equipped with an optical particle sensor. The spread of expired air was qualitatively and quantitatively assessed using schlieren imaging. Moreover, user satisfaction surveys were conducted to evaluate the comfort of wearing face masks during training. The results indicated that both surgical and FFP2 masks significantly reduced particles emission with a reduction efficiency of 87.1% and 91.3% of all particle sizes, respectively. However, compared to surgical masks, FFP2 masks provided a nearly tenfold greater reduction of the particle size range with long residence time in the air (0.3-0.5 μm). Furthermore, the investigated masks reduced exhalation spreading distances to less than 0.15 m and 0.1 m in the case of the surgical mask and FFP2 mask, respectively. User satisfaction solely differed with respect to perceived dyspnea between no mask and FFP2 mask conditions.
由于体育锻炼会使呼吸频率升高，所以它是气溶胶排放的一种特殊情况。这可能会导致空气传播病毒和呼吸道疾病传播得更快。因此，本研究调查了训练期间的交叉感染风险。12名受试者在三种口罩佩戴情况下，即在不戴口罩、佩戴外科口罩和佩戴FFP2口罩的情况下，在自行车测力计上进行锻炼。在一个配备了光学粒子传感器测量装置的灰色房间里测量所排放的气溶胶。使用纹影成像对呼出空气的扩散进行了定性和定量评估。此外，还进行了用户满意度调查，以评估训练期间佩戴口罩的舒适度。结果表明，外科口罩和FFP2口罩均显著减少了颗粒物排放，所有粒径的减少效率分别为87.1%和91.3%。然而，与外科口罩相比，FFP2口罩对空气中停留时间长的粒径范围（0.3 - 0.5μm）的减少幅度几乎大了十倍。此外，对于所研究的口罩，外科口罩和FFP2口罩分别将呼气扩散距离减少到小于0.15米和0.1米。用户满意度仅在不戴口罩和佩戴FFP2口罩两种情况下的呼吸困难感受方面存在差异。
