Incidence and factor analysis for the heat-related illness on the Tokyo 2020 Olympic and Paralympic Games.

Introduction: Among the 43 venues of Tokyo 2020 Olympic Games (OG) and 33 venues of Paralympic Games (PG) were held, the heat island effect was highly expected to cause heat-related illnesses in the outdoor venues with maximum temperatures exceeding 35°C. However, the actual number of heat-related illness cases during the competition was lower than that was initially expected, and it was unclear under what conditions or environment-related heat illnesses occurred among athletes. Object: To clarify the cause and factors contributing to the occurrence of heat-related illness among athletes participating in the Tokyo 2020 Olympic and Paralympic Games. Method: This retrospective descriptive study included 15 820 athletes from 206 countries. From 21 July 2021 to 8 August 2021 for the Olympics, and from 24 August 2021 to 5 September 2021 for the Paralympics. The number of heat-related illness cases at each venue, the incidence rate for each event, gender, home continent, as well as the type of competition, environmental factors (such as venue, time, location and wet-bulb globe temperature (WBGT)), treatment factor and the type of competition were analysed. Results: More number of heat-related illnesses among athletes occurred at the OG (n=110, 76.3%) than at the PG (n=36, 23.7%). A total of 100 cases (100%) at the OG and 31 cases (86.1%) at the PG occurred at the outdoors venues. In the OG, a total of 50 cases (57.9%) occurred during the competition of marathon running and race walking at Sapporo Odori Park. Six of those, were diagnosed with exertional heat illness and treated with cold water immersion (CWI) at OG and one case at PG. Another 20 cases occurred in athletics (track and field) competitions at Tokyo National Olympic Stadium. In total, 10 cases (10.0%) were diagnosed with severe heat illness in the OG and 3 cases (8.3%) in the PG. Ten cases were transferred to outside medical facilities for further treatment, but no case has been hospitalised due to severe condition. In the factor analysis, venue zone, outdoor game, high WBGT (<28°C) and endurance sports have been found to have a higher risk of moderate and severe heat-related illness (p<0.05). The incidence rate and severity could be attenuated by proper heat-related illness treatment (CWI, ice towel, cold IV transfusion and oral hydration) reduced the severity of the illness, providing summer hot environment sports. Conclusion: The Tokyo 2020 Olympic and Paralympic summer games were held. Contrary to expectations, we calculated that about 1 in 100 Olympic athletes suffered heat-related illness. We believe this was due to the risk reduction of heat-related illness, such as adequate prevention and proper treatment. Our experience in avoiding heat-related illness will provide valuable data for future Olympic summer Games.

Lots of luck on thin ice from Tokyo to Paris: Following the track of the preparedness and results of Emergency Medical Services and Disaster Medical Response during 2020 Tokyo Olympic and Paralympic Games from the Perspective of Academic Consortium (AC2020) of Japan and Medical Advisory Board of Tokyo Metropolitan Government

Summary Introduction The 2020 Tokyo Olympic and Paralympic Games (2020 Tokyo Olympics) was held in Japan during the pandemic of new coronavirus infection (COVID-19) in 2021. Preparedness In 2016, the Academic Consortium consisting of 29 major medical associations (AC2020) was launched and undertook medical risk assessment, issuing statements, and disseminating manuals/guidelines, training materials through its website. Administratively, Tokyo Organizing Committee of the Olympic and Paralympic Games (TOC) was responsible for preparations inside the venue, while Tokyo Metropolitan Government (TMG) was responsible for preparations on the last mile and around the venue. In response to the AC2020 recommendation, the TOC and TMG has set up the subcommittee for reviewing emergency and disaster medical systems for the games. Finally, the 2020 Tokyo Olympics gave up accepting spectators from abroad and limited domestic spectators. The multi-organizational training was not systematically performed until just prior to the event due to the delay in deciding on the form of this big event. Results A total of 779,820 people participated during the entire period. The 316 patients were seen at hospitals including 53 COVID- 19 cases, and the patient presentation rate (PPR) was 2.4/1000. The COVID-19 cases in Japan increased as the games approached, and a major wave peak of the epidemic was observed during the games. Conclusion If MCI had occurred during the games, the current medical care system would not have been able to cope with such situation. We were walking on thin ice, but fortunately, we didn’t step out and drown in the water. Résumé Introduction Les Jeux Olympiques et Paralympiques de Tokyo 2020 (Jeux Olympiques de Tokyo 2020) ont eu lieu au Japon pendant la pandémie COVID-19 en 2021. Préparation En 2016, le Consortium Académique composé de 29 grandes associations médicales (AC2020) a été lancé et a entrepris une évaluation des risques médicaux, publié des mises aux points et diffusé des manuels/directives, du matériel de formation via son site Web. Sur le plan administratif, le comité d’organisation des Jeux olympiques et paralympiques de Tokyo (TOC) était responsable des préparatifs à l’intérieur du site, tandis que le gouvernement métropolitain de Tokyo (TMG) était responsable des préparatifs sur le dernier kilomètre et autour du site. En réponse à la recommandation AC2020, le COT et le TMG ont mis en place le sous-comité chargé d’examiner les dispositifs prévisionnels de secours pour les urgences et en cas de catastrophe pour les jeux. Enfin, les Jeux Olympiques de Tokyo 2020 ont renoncé à recevoir des spectateurs étrangers et ont limité les spectateurs nationaux. La formation multi-organisationnelle n’a été systématiquement effectuée que juste avant l’événement en raison du retard dans la décision sur la forme de ce grand événement. Résultats Au total, 779820 personnes ont participé pendant toute la période. Les 316 patients ont été vus dans les hôpitaux dont 53 cas de COVID-19, et le taux de présentation des patients (PPR) était de 2,4/1000. Les cas de COVID-19 au Japon ont augmenté à l’approche des jeux, et un pic de vague majeur de l’épidémie a été observé pendant les jeux. Conclusion Si un afflux de victimes s’était produit pendant les jeux, le système de soins médicaux actuel n’aurait pas été en mesure de faire face à une telle situation. Nous marchions sur de la glace mince, mais heureusement, nous n’avons pas dérapé et ne nous sommes pas noyés dans l’eau.

Influence of the coronavirus disease 2019 (COVID-19) pandemic on the incidence of heat stroke and heat exhaustion in Japan: a nationwide observational study based on the Heatstroke STUDY 2019 (without COVID-19) and 2020 (with COVID-19).

AIM: To assess heat stroke and heat exhaustion occurrence and response during the coronavirus disease 2019 pandemic in Japan. METHODS: This retrospective, multicenter, registry-based study describes and compares the characteristics of patients between the months of July and September in 2019 and 2020. Factors affecting heat stroke and heat exhaustion were statistically analyzed. Cramér's V was calculated to determine the effect size for group comparisons. We also investigated the prevalence of mask wearing and details of different cooling methods. RESULTS: No significant differences were observed between 2019 and 2020. In both years, in-hospital mortality rates just exceeded 8%. Individuals >65 years old comprised 50% of cases and non-exertional onset (office work and everyday life) comprised 60%-70%, respectively. The recommendations from the Working Group on Heat Stroke Medicine given during the coronavirus disease pandemic in 2019 had a significant impact on the choice of cooling methods. The percentage of cases, for which intravascular temperature management was performed and cooling blankets were used increased, whereas the percentage of cases in which evaporative plus convective cooling was performed decreased. A total of 49 cases of heat stroke in mask wearing were reported. CONCLUSION: Epidemiological assessments of heat stroke and heat exhaustion did not reveal significant changes between 2019 and 2020. The findings suggest that awareness campaigns regarding heat stroke prevention among the elderly in daily life should be continued in the coronavirus disease 2019 pandemic. In the future, it is also necessary to validate the recommendations of the Working Group on Heatstroke Medicine.

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

Aim This study aimed to measure the influence of wearing face masks on individuals’ physical status in a hot and humid environment. Methods 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. Results 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. Conclusion Mask wearing is not a risk factor for heatstroke during increased exercise intensity. This study aimed to measure the influence of wearing face masks in hot and humid environments in different physical situations: (i) not wearing a mask (control), (ii) wearing a surgical mask, (iii) wearing a sport mask. In all six participants, significant changes were observed in heart rate and internal core temperature with increased exercise intensity;however, no significant differences were observed between these parameters and urinary liver fatty acid‐binding protein among the three intervention groups. Mask wearing is not a risk factor for heatstroke during increased‐intensity exercise.

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

AIM: This study aimed to measure the influence of wearing face masks on individuals' physical status in a hot and humid environment. METHODS: 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. RESULTS: 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. CONCLUSION: Mask wearing is not a risk factor for heatstroke during increased exercise intensity.

Quantitative analysis of the impact of COVID-19 on the emergency medical services system in Tokyo.

AIM: The coronavirus disease 2019 (COVID-19) pandemic has imposed a heavy burden on emergency medical services (EMS) systems. Therefore, we quantitatively analyzed impacts of COVID-19 on the EMS system in Tokyo. METHODS: In this retrospective observational study, we used publicly available data, including the daily number of newly diagnosed patients with COVID-19, the weekly number of transport difficulties, and the field activity time, from March 2, 2020, to January 25, 2021. Data for the same period in the previous year were used as controls. RESULTS: The total number of EMS calls decreased by 12.7% in 2020 compared with that in 2019. The number of daily transport difficulties significantly increased in 2020 compared with that in 2019 (89 [72-120] vs 57 [49-63]; P < 0.001). Additionally, the field activity time significantly increased in 2020 compared with that in 2019 (22.7 [22.3-23.8] min vs 20.7 [20.6-21.2] min; P < 0.001). Furthermore, the daily number of new patients with COVID-19 was positively correlated with the number of transport difficulties (R = 0.76) and the field activity time on the scene (R = 0.74). With an increase in the number of people infected with COVID-19 by 1,000, the number of daily transport difficulties increased by 86.4. Per 1,000 infected patients per day, the field activity time increased by 3.48 min. CONCLUSION: This study revealed that the increase in the number of patients with COVID-19 indirectly affected the EMS system in Tokyo.