Medical Emergencies During a Half Marathon Race – The Influence of Weather

Abstract

The aim was to analyze the influence of weather conditions on medical emergencies in a half-marathon, specifically by evaluating its relation to the number of non-finishers, ambulance-required assistances, and collapses in need of ambulance as well as looking at the location of such emergencies on the race course. Seven years of data from the world’s largest half marathon were used. Meteorological data were obtained from a nearby weather station, and the Physiological Equivalent Temperature (PET) index was used as a measure of general weather conditions. Of the 315,919 race starters, 104 runners out of the 140 ambulance-required assistances needed ambulance services due to collapses. Maximum air temperature and PET significantly co-variated with ambulance-required assistances, collapses, and non-finishers (R²=0.65–0.92; p=0.001–0.03). When air temperatures vary between 15–29°C, an increase of 1°C results in an increase of 2.5 (0.008/1000) ambulance-required assistances, 2.5 (0.008/1000) collapses (needing ambulance services), and 107 (0.34/1000) non-finishers. The results also indicate that when the daily maximum PET varies between 18–35°C, an increase of 1°C PET results in an increase of 1.8 collapses (0.006/1000) needing ambulance services and 66 non-finishers (0.21/1000).

Key words

city run - non-finishers - medical emergencies - ambulance transports - collapses

• References

• 1 Budd G. Wet-bulb globe temperature (WBGT) – its history and its limitations. J Sci Med Sport 2008; 11: 20-32
• 2 Chang WL, Shih YF, Chen WY. Running injuries and associated factors in participants of ING Taipei Marathon. Phys Ther Sport 2012; 13: 170-174
• 3 dAmbrosio Alfano FR, Malchaire J, Palella BI, Riccio G. WBGT index revisited after 60 years of use. Ann Occup Hyg 2012; 58: 955-970
• 4 Dehghan H, Mortazavi SB, Jafari MJ, Maracy MR. Evaluation of wet bulb globe temperature index for estimation of heat strain in hot/humid conditions in the Persian Gulf. J Res Med Sci 2012; 17: 1108-1113
• 5 Ely MR, Cheuvront SN, Roberts WO, Montain SJ. Impact of weather on marathon-running performance. Med Sci Sports Exerc 2007; 39: 487-493
• 6 Farahmand B, Hållmarker U, Brobert GP, Ahlbom A. Acute mortality during long-distance ski races (Vasaloppet). Scand J Med Sci Sports 2007; 17: 356-361
• 7 Hue O, Henri S, Baillot M, Sinnapah S, Uzel AP. Thermoregulation, hydration and performance over 6 days of trail running in the tropics. Int J Sports Med 2014; 35: 906-911
• 8 Höppe P. The physiological equivalent temperature - a universal index for the biometeorological assessment of the thermal environment. Int J Biometeorol 1999; 43: 71-75
• 9 International Standards Organization . Hot environments—estimation of the heat stress on working man, based on the WBGT-index (wet bulb globe temperature). ISO Standard 7243. Geneva, Switzerland: Int Stand Org; 1989: 1-3
• 10 Kristensen E, Skille EÅ, Hanstad DV. From community based identities to individual benefits for volunteers. a comparison of three sporting events. Scandinavian Sport Studies Forum 2014; 5: 47-68
• 11 Lane AM, Devonport TJ, Friesen AP, Beedie CJ, Fullerton CL, Stanley DM. How should I regulate my emotions if I want to run faster?. Eur J Sport Sci 2015; 16: 465-472
• 12 Lehto N. Effects of age on marathon finishing time along male amateur runners in Stockholm Marathon. J Sport Health Sci 2016; 5: 349-354
• 13 Mayer H, Höppe P. (1987) Thermal comfort of man in different urban environments. Theor Appl Climatol 1987; 38: 43-49
• 14 Milsten AM, Maguire BJ, Bissell RA, Seamen KG. Mass-gathering medical care: A review of the literature. Prehosp Disaster Med 2002; 17: 151-162
• 15 Rasmussen CH, Nielsen RO, Juul MS, Rasmussen S. Weekly running volume and risk of running-related injuries among marathon runners. Int J Sports Phys Ther 2013; 8: 111-120
• 16 Reid SA, Speedy DB, Thompson JM, Noakes TD, Mulligan G, Page T, Milne C. Study of hematological and biochemical parameters in runners completing a standard marathon. Clin J Sports Med 2004; 14: 344-353
• 17 Schwabe K, Schwellnus MP, Derman W, Swanevelder S, Jordaan E. Medical complications and deaths in 21 and 56 km road race runners: A 4-year prospective study in 65 865 runners—SAFER study I. Br J Sports Med 2014; 48: 912-918
• 18 Schwabe K, Schwellnus MP, Derman W, Swanevelder S, Jordaan E. Older females are at higher risk for medical complications during 21 km road race running: a prospective study in 39 511 race starters—SAFER study III. Br J Sports Med 2014; 48: 891-897
• 19 Taylor BA, Thompson PD. How to train for a marathon. Circulation 2014; 130: 98-99
• 20 Vihma T. Effects of weather on the performance of marathon runners. Int J Biometeorol 2010; 54: 297-306