Physiological, Perceptual and Performance Responses Associated With Self-Selected Versus Standardized Recovery Periods During a Repeated Sprint Protocol in Elite Youth Football Players: A Preliminary Study

摘要

Purpose: To examine the physiological and perceptual responses of youth footballers to a repeated sprint protocol employing standardized and self-selected recovery. Methods: Eleven male participants (13.7 +/- 1.1 years) performed a repeated sprint assessment comprising 10 x 30 m efforts. Employing a randomized crossover design, repeated sprints were perfoinied using 30 s and self-selected recovery periods. Heart rate was monitored continuously with ratings of perceived exertion (RPE) and lower body muscle power measured 2 min after the final sprint. The concentration of blood lactate was measured at 2, 5 and 7 min post sprinting. Magnitude of effects were reported using effect size (ES) statistics +/- 90% confidence interval and percentage differences. Differences between trials were examined using paired student t tests (p < .05). Results: Self-selected recovery resulted in most likely shorter recovery times (57.7%; ES 1.55 +/- 0.5; p < .01), a most likely increase in percentage decrement (65%; ES 0.36 +/- 0.21; p = .12), very likely lower heart rate recovery (-58.9%; ES-1.10 +/- 0.72; p = .05), and likely higher blood lactate concentration (p = .08-0.02). Differences in lower body power and RPE were unclear (p > .05). Conclusion: Self-selected recovery periods compromise repeated sprint performance.