17th Annual ECSS-Congress, Bruges 2012

Abstract details

Abstract-ID: 263
Session: [EP-UD01] E-poster undebated
Lecture room: On screens
Date & time: 02.07.2014 / -
Title of the paper: Influence of oxygen kinetics on physical performance in youth soccer
Authors: Doncaster, G.1, Marwood, S.2, Drust, B.3, Iga, J.3,4, Unnithan, V.1
Institution: 1Staffordshire University (UK), 2Liverpool Hope University (UK), 3Liverpool John Moores University (UK), 4The FA (UK)
Department: Faculty of Health Sciences
Country: United Kingdom
Abstract text Introduction The ability to perform, maintain and repeat high intensity actions, as well as the capacity to transition from low to high intensity activity frequently and efficiently, to minimise fatigue is essential in elite youth soccer. Quantifying these transitions could provide valuable information for coaches. Measurements of oxygen uptake kinetics (VO2 kinetics) may provide a useful insight into the relationships between the efficacy of transitions between workloads and physical performance in youth soccer. The aim of the study was to examine the relationship between VO2 kinetics, during work-to-work transitions, and physical measures associated with soccer match-play, within a group of highly trained youth soccer players. Methods Seventeen highly trained youth soccer players (age:13.3±0.4y, Tanner:3±1) volunteered for the study. Players initially completed an incremental treadmill protocol to exhaustion, to establish ventilatory threshold (VT) and VO2max (59.1±5.4 mL.kg-1.min-1). On the two subsequent visits, players completed a work-to-work protocol for the assessment of VO2 kinetics (moderate: 95%VT, severe: 60%D). Physical soccer-based performance was measured by a maximal Yo-Yo Intermittent Recovery Test Level 1 (YoYo-IR1) and the monitoring of total distance covered (TDC), relative high speed running (HSR) and very high speed running (VHSR), high speed efforts (HSReff), and very high speed efforts (VHSReff) during three 2x20min, 10v10 matches, using 10Hz GPS (Catapult, Australia). Partial correlations between VO2 kinetics and physical soccer-based measures were performed on the whole sample. Following this, an intra-group comparison was conducted, with performance in the maximal YoYo-IR1 being used as the criterion variable (Below Average (BA) n=9, Above Average (AA) n=8). Results Partial correlations revealed significant inverse relationships for the unloaded to moderate transition time constants (tau): YoYo-IR1 performance (r = -0.58, P=0.02) and GPS variables (TDC: r = -0.64, P=0.007, HSR :r = -0.64, P=0.008, HSReff: r = -0.66, P=0.005). Intra-group analysis found no significant difference between tau. However, differences in unloaded to moderate tau revealed a large effect size (Cohen’s d=0.86) (AA:18.4±4.4 vs.BA:24.1±8.7s). Conclusion The present study demonstrates that measures of VO2 kinetics maybe an indicator of physical measures associated with soccer match-play and subsequently used as a measure to distinguish between those of superior physical performance, within a group of youth soccer players. Based on these findings, the physiological capacity to transition rapidly between workloads is a potential determinant of superior physical performance in highly trained youth soccer players. d031348b@student.staffs.ac.uk
Topic: Physiology
Keyword I: oxygen kinetics
Keyword II: youth soccer
Keyword III: physical performance