Institute for Integrated Sports Medicine, Keio University School of Medicine, Tokyo, Japan.
Department of Cardiology, Keio University School of Medicine, Tokyo, Japan.
PLoS One. 2021 Nov 10;16(11):e0257549. doi: 10.1371/journal.pone.0257549. eCollection 2021.
Particulate generation occurs during exercise-induced exhalation, and research on this topic is scarce. Moreover, infection-control measures are inadequately implemented to avoid particulate generation. A laminar airflow ventilation system (LFVS) was developed to remove respiratory droplets released during treadmill exercise. This study aimed to investigate the relationship between the number of aerosols during training on a treadmill and exercise intensity and to elucidate the effect of the LFVS on aerosol removal during anaerobic exercise. In this single-center observational study, the exercise tests were performed on a treadmill at Running Science Lab in Japan on 20 healthy subjects (age: 29±12 years, men: 80%). The subjects had a broad spectrum of aerobic capacities and fitness levels, including athletes, and had no comorbidities. All of them received no medication. The exercise intensity was increased by 1-km/h increments until the heart rate reached 85% of the expected maximum rate and then maintained for 10 min. The first 10 subjects were analyzed to examine whether exercise increased the concentration of airborne particulates in the exhaled air. For the remaining 10 subjects, the LFVS was activated during constant-load exercise to compare the number of respiratory droplets before and after LFVS use. During exercise, a steady amount of particulates before the lactate threshold (LT) was followed by a significant and gradual increase in respiratory droplets after the LT, particularly during anaerobic exercise. Furthermore, respiratory droplets ≥0.3 μm significantly decreased after using LFVS (2120800±759700 vs. 560 ± 170, p<0.001). The amount of respiratory droplets significantly increased after LT. The LFVS enabled a significant decrease in respiratory droplets during anaerobic exercise in healthy subjects. This study's findings will aid in exercising safely during this pandemic.
颗粒物在运动诱导呼气时产生，而关于这一主题的研究还很匮乏。此外，为避免颗粒物产生，感染控制措施也没有得到充分执行。为此，我们开发了一种层流空气通风系统（LFVS），以去除在跑步机上运动时释放的呼吸飞沫。本研究旨在调查在跑步机上训练时气溶胶数量与运动强度之间的关系，并阐明 LFVS 在无氧运动时去除气溶胶的效果。在这项单中心观察性研究中，在日本跑步科学实验室的跑步机上对 20 名健康受试者（年龄：29±12 岁，男性：80%）进行了运动测试。这些受试者有氧能力和健康水平广泛，包括运动员，且没有合并症。他们均未服用药物。运动强度以 1km/h 的增量增加，直到心率达到预计最大心率的 85%，然后保持 10 分钟。前 10 名受试者用于分析运动是否会增加呼出空气中空气传播颗粒物的浓度。对于其余 10 名受试者，在恒负荷运动期间激活 LFVS，以比较 LFVS 使用前后呼吸飞沫的数量。在运动过程中，在乳酸阈（LT）之前稳定的颗粒物数量后，LT 后呼吸飞沫显著且逐渐增加，特别是在无氧运动期间。此外，使用 LFVS 后≥0.3μm 的呼吸飞沫显著减少（2120800±759700 对 560±170，p<0.001）。LT 后呼吸飞沫的量显著增加。LFVS 可使健康受试者在无氧运动时呼吸飞沫显著减少。本研究的发现将有助于在大流行期间安全运动。
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