Short-Term Speed Variability as an Index of Pacing Stochasticity in Athletic Running Events

Boullosa, D, Patrocinio, E, Renfree, Andrew ORCID: https://orcid.org/0000-0001-9039-8574, Casado, A, Hanley, B and Foster, C (2023) Short-Term Speed Variability as an Index of Pacing Stochasticity in Athletic Running Events. Journal of Functional Morphology and Kinesiology, 8 (2). p. 86. ISSN 2411-5142

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Abstract

We aimed to compare differences in performance and pacing variability indices between 5000 m heats and finals during major championships in men and women. Data with 100 m time resolution were used to compare overall pacing variability (standard deviation of 100 m section times, SD; and coefficient of variation, CV%) and short-term pacing variability (root mean square of successive differences between 100 m section times, RMSSD). The changes in performance and pacing indices differed between races and competitions. For instance, the men’s final in Beijing 2008 was quicker than the heat (p < 0.01) while the CV% was reduced (p = 0.03) and RMSSD increased (p < 0.01). For women, the heats and the final exhibited a similar mean time in London 2017 (p = 0.33) but with CV% (p < 0.001) and RMSSD (p < 0.001) showing opposite trends. Individual analyses of men’s and women’s champions revealed highly individual variability metrics. The use of RMSSD can complement overall variability indices for better characterization of pacing stochasticity.

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