Publications by authors named "Styliani Ziaka"

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Effects of Weather Parameters on Endurance Running Performance: Discipline Specific Analysis of 1258 Races.

Med Sci Sports Exerc 2021 Oct 14. Epub 2021 Oct 14.

FAME Laboratory, Department of Physical Education and Sport Science, University of Thessaly, Trikala, Greece University of Canberra, Research Institute for Sport and Exercise, Canberra, Australia Aspetar Orthopaedic and Sports Medicine Hospital, Research and Scientific Support Department, Doha, Qatar Department of Nutrition, Exercise and Sports, Section for Integrative Physiology, University of Copenhagen, Denmark.

Introduction: This study evaluated how single or combinations of weather parameters (temperature, humidity, wind speed, solar load) affect peak performance during endurance running events and identify which events are most vulnerable to varying weather conditions.

Methods: Results for the marathon, 50 km race-walk, 20 km race-walk, 10,000 m, 5,000 m and 3,000 m-steeplechase were obtained from the official websites of large competitions. We identified meteorological data from nearby (8.9 ± 9.3 km) weather stations for 1258 races held between 1936 and 2019 across 42 countries, enabling analysis of 7867 athletes.

Results: The Wet-Bulb Globe Temperature (WBGT) across races ranged from -7 to 33 °C, with 27% of races taking place in cold/cool, 47% in neutral, 18% in moderate heat, 7% in high heat, and 1% in extreme heat conditions, according to the World Athletics classification. Machine learning decision trees (R2 values: 0.21-0.58) showed that air temperature (importance score: 40%) was the most important weather parameter. But, when used alone, air temperature had lower predictive power (R2 values: 0.04-0.34) than WBGT (R2 values: 0.11-0.47). Conditions of 7.5-15 °C WBGT (or 10-17.5 °C air temperature) increase the likelihood for peak performance. For every degree WBGT outside these optimum conditions, performance declined by 0.3-0.4%.

Conclusion: More than one-quarter of endurance running events were held in moderate, high, or extreme heat and this number reaches one-half for events other than the marathon. All four weather parameters must be evaluated to mitigate the health and performance implications of exercising at maximal intensities in a hot environment with athletes adopting heat mitigation strategies when possible.
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http://dx.doi.org/10.1249/MSS.0000000000002769DOI Listing
October 2021
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