Tracking performance changes with running-stride variability when athletes are functionally overreached

Joel T. Fuller, Clint R. Bellenger, Dominic Thewlis, John Arnold, Rebecca L. Thomson, Margarita D. Tsiros, Eileen Y. Robertson, Jonathan D. Buckley

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Purpose: Stride-to-stride fluctuations in running-stride interval display long-range correlations that break down in the presence of fatigue accumulated during an exhaustive run. The purpose of the study was to investigate whether long-range correlations in running-stride interval were reduced by fatigue accumulated during prolonged exposure to a high training load (functional overreaching) and were associated with decrements in performance caused by functional overreaching. Methods: Ten trained male runners completed 7 d of light training (LT7), 14 d of heavy training (HT14) designed to induce a state of functional overreaching, and 10 d of light training (LT10) in a fixed order. Running-stride intervals and 5-km time-trial (5TT) performance were assessed after each training phase. The strength of long-range correlations in running-stride interval was assessed at 3 speeds (8, 10.5, and 13 km/h) using detrended fluctuation analysis. Results: Relative to performance post-LT7, time to complete the 5TT was increased after HT14 (+18 s; P <.05) and decreased after LT10 (-20 s; P = .03), but stride-interval long-range correlations remained unchanged at HT14 and LT10 > .50). Changes in stride-interval long-range correlations measured at a 10.5-km/h running speed were negatively associated with changes in 5TT performance (r-.46; P = .03). Conclusions: Runners who were most affected by the prolonged exposure to high training load (as evidenced by greater reductions in 5TT performance) experienced the greatest reductions in stride-interval long-range correlations. Measurement of stride-interval long-range correlations may be useful for monitoring the effect of high training loads on athlete performance.

Original languageEnglish
Pages (from-to)357-363
Number of pages7
JournalInternational Journal of Sports Physiology and Performance
Volume12
Issue number3
DOIs
Publication statusPublished - Mar 2017
Externally publishedYes

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Keywords

  • overreaching
  • overtraining syndrome
  • fatigue
  • nonlinear dynamics
  • long-range correlation

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