Wearing a face mask during controlled‐intensity exercise is not a risk factor for exertional heatstroke: A pilot study

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  • Taigo Sakamoto
    Department of Emergency and Critical Care Medicine Nippon Medical School Tokyo Japan
  • Hiroyuki Narita
    Graduate School of Medical and Health Science Nippon Sport Science University Tokyo Japan
  • Kensuke Suzuki
    Graduate School of Medical and Health Science Nippon Sport Science University Tokyo Japan
  • Hirofumi Obinata
    Department of Emergency and Critical Care Medicine Nippon Medical School Tokyo Japan
  • Kei Ogawa
    Department of Industrial Administration Tokyo University of Science Tokyo Japan
  • Ryotaro Suga
    Department of Emergency and Critical Care Medicine Nippon Medical School Tokyo Japan
  • Haruka Takahashi
    Graduate School of Medical and Health Science Nippon Sport Science University Tokyo Japan
  • Mayumi Nakazawa
    Graduate School of Medical and Health Science Nippon Sport Science University Tokyo Japan
  • Marina Yamada
    Graduate School of Medical and Health Science Nippon Sport Science University Tokyo Japan
  • Satoo Ogawa
    Graduate School of Medical and Health Science Nippon Sport Science University Tokyo Japan
  • Hiroyuki Yokota
    Graduate School of Medical and Health Science Nippon Sport Science University Tokyo Japan
  • Shoji Yokobori
    Department of Emergency and Critical Care Medicine Nippon Medical School Tokyo Japan

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<jats:sec><jats:title>Aim</jats:title><jats:p>This study aimed to measure the influence of wearing face masks on individuals’ physical status in a hot and humid environment.</jats:p></jats:sec><jats:sec><jats:title>Methods</jats:title><jats:p>Each participant experienced different physical situations: (i) not wearing a mask (control), (ii) wearing a surgical mask, (iii) wearing a sport mask. An ingestible capsule thermometer was used to measure internal core body temperature during different exercises (standing, walking, and running, each for 20 min) in an artificial weather room with the internal wet‐bulb globe temperature set at 28°C. The change in the participants’ physical status and urinary liver fatty acid‐binding protein (L‐FABP) were measured.</jats:p></jats:sec><jats:sec><jats:title>Results</jats:title><jats:p>Six healthy male volunteers were enrolled in the study. In each participant, significant changes were observed in the heart rate and internal core temperatures after increased exercise intensity; however, no significant differences were observed between these parameters and urinary L‐FABP among the three intervention groups.</jats:p></jats:sec><jats:sec><jats:title>Conclusion</jats:title><jats:p>Mask wearing is not a risk factor for heatstroke during increased exercise intensity.</jats:p></jats:sec>

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