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- W4387054448 abstract "The American College of Sports Medicine proposes that competitive running events should be postponed or cancelled when the wet bulb globe temperature (WBGT) exceeds 28 °C to mitigate the risk of exertional heat illness (EHI) among participants. While these guidelines protect runners during competition, the prevalence of individuals who run under conditions which could increase their risk of EHI remains largely unknown. PURPOSE: To describe the prevalence of running in ambient conditions which exceed a WBGT of 28 °C, and heat-related symptoms during training between April and September 2022, inclusively. METHODS: A total of 274 participants (30.8 ± 5.2 y, 234 males) across the Northern Hemisphere provided over 1.7 million minutes of outdoor running data. Additionally, 210 participants (77%) responded to a survey about their experience with heat-related symptoms. Environmental conditions for each run were aggregated from National Oceanic and Atmospheric Administration datasets at a 0.5° × 0.5° resolution. RESULTS: 62 participants (22%) engaged in at least one run where WBGT was >28 °C (Range: 1 - 35 runs). Of the 29,031 runs, 344 (1.2%) were conducted with a peak WBGT >28 °C, and WBGT was >28 °C at the start of 285 runs (82.8%). Of the runs where average pace was ≥3 m/s (n = 173), 149 runs (86.6%) were ≥ 5 km in distance. Runs where peak WBGT exceeded 28 °C were commenced later in the day (WBGT ≤28 °C: 12 h14 ± 20 mins, >28 °C: 13 h55 ± 55 mins, p < 0.001). Of those who completed the survey, 42.8% reported experiencing at least one heat-related symptom during training (fatigue: 85%, muscle cramps: 34%, serious discomfort: 23%, nausea: 22%, gastrointestinal distress: 21%, headache: 14%, and/or vomiting: 6%), with elevated symptom frequency per month associated with increases in monthly mean peak WBGT in training (No symptoms: 15.3 ± 5.4 °C, 1 symptom: 18.4 ± 5.5 °C, 2 symptoms: 18.6 ± 4.7 °C, 3 symptoms: 18.8 ± 3.4 °C, 4 symptoms: 18.3 ± 5.4 °C, +5 symptoms: 20.7 ± 3.6 °C, p < 0.001). CONCLUSIONS: Approximately 1.2% of all runs between April and September 2022 were conducted where peak WBGT exceeded 28 °C, and over 22% of all participants completed at least one run when WBGT was >28 °C. An elevated frequency of heat-related symptoms per month may be associated with the mean peak WBGT experienced during training. Support by NSERC (RGPIN-2022-05096)" @default.
- W4387054448 created "2023-09-27" @default.
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- W4387054448 date "2023-09-01" @default.
- W4387054448 modified "2023-09-27" @default.
- W4387054448 title "Prevalence Of Running In Extreme Heat Across The Northern Hemisphere" @default.
- W4387054448 doi "https://doi.org/10.1249/01.mss.0000980828.60662.d1" @default.
- W4387054448 hasPublicationYear "2023" @default.
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