The Effects of 120 Minutes of Simulated Match Play on Indices of Acid-Base Balance in Professional Academy Soccer Players

Liam Harper, Tom Clifford, Marc Briggs, Ged McNamee, Dan West, Emma Stevenson, Mark Russell

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

This study investigated the changes in indices of acid-base balance during 120 minutes of simulated soccer match play that included a 30 minute extra-time (ET) period. Eight English Premier League academy soccer players participated in a simulated soccer match that required varying intensities of intermittent exercise including 15-m sprints and soccer dribbling throughout. Blood samples were obtained before (i.e., baseline and pre-exercise) and throughout exercise (i.e., 15, 30, 45, 60, 75, 90, 105, and 120 minutes), and at half time. Sprint speeds over 15 m reduced in ET compared to the first half (-0.39 ± 0.37 m·s-1, -7 ± 6%, p = 0.021) but not the second half (-0.18 ± 0.25 m·s-1, -3 ± 4%, p = 0.086). At 105 minutes, blood lactate concentrations reduced compared with that in the opening 30 minutes (-0.9 to -1.2 mmol·L-1, p 0.05). Although the perturbations in acid-base balance during ET were statistically significant, the decreases in blood pH, lactate, base excess, and bicarbonate concentrations may not represent metabolic acidosis or impairments in buffering capacity that are likely to explain reduced physical performance. Further research is warranted to investigate mechanisms of fatigue during ET and to develop interventions that attenuate decrements in performance.
Original languageEnglish
Pages (from-to)1517-1524
JournalJournal of Strength and Conditioning Research
Volume30
Issue number6
DOIs
Publication statusPublished - Jun 2016

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