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Laminar flow ventilation system to prevent airborne infection during exercise in the COVID-19 crisis: A single-center observational study.
Katsumata, Yoshinori; Sano, Motoaki; Okawara, Hiroki; Sawada, Tomonori; Nakashima, Daisuke; Ichihara, Genki; Fukuda, Keiichi; Sato, Kazuki; Kobayashi, Eiji.
  • Katsumata Y; Institute for Integrated Sports Medicine, Keio University School of Medicine, Tokyo, Japan.
  • Sano M; Department of Cardiology, Keio University School of Medicine, Tokyo, Japan.
  • Okawara H; Department of Cardiology, Keio University School of Medicine, Tokyo, Japan.
  • Sawada T; Department of Orthopaedic Surgery, Keio University School of Medicine, Tokyo, Japan.
  • Nakashima D; Department of Orthopaedic Surgery, Keio University School of Medicine, Tokyo, Japan.
  • Ichihara G; Department of Orthopaedic Surgery, Keio University School of Medicine, Tokyo, Japan.
  • Fukuda K; Department of Cardiology, Keio University School of Medicine, Tokyo, Japan.
  • Sato K; Department of Cardiology, Keio University School of Medicine, Tokyo, Japan.
  • Kobayashi E; Institute for Integrated Sports Medicine, Keio University School of Medicine, Tokyo, Japan.
PLoS One ; 16(11): e0257549, 2021.
Article in English | MEDLINE | ID: covidwho-1793615
ABSTRACT
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.
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Full text: Available Collection: International databases Database: MEDLINE Main subject: Exercise / Air Conditioning / Particulate Matter / COVID-19 Type of study: Experimental Studies / Observational study / Prognostic study Limits: Adult / Female / Humans / Male Country/Region as subject: Asia Language: English Journal: PLoS One Journal subject: Science / Medicine Year: 2021 Document Type: Article Affiliation country: Journal.pone.0257549

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Full text: Available Collection: International databases Database: MEDLINE Main subject: Exercise / Air Conditioning / Particulate Matter / COVID-19 Type of study: Experimental Studies / Observational study / Prognostic study Limits: Adult / Female / Humans / Male Country/Region as subject: Asia Language: English Journal: PLoS One Journal subject: Science / Medicine Year: 2021 Document Type: Article Affiliation country: Journal.pone.0257549