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

Liam D. Harper, Tom Clifford, Marc A. Briggs, Ged McNamee, Daniel J. West, Emma Stevenson, Mark Russell

Research output: Contribution to journalArticle

5 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). Blood pH (−0.03 to −0.04 units), base excess (−0.95 to −1.48 mmol·L−1), and bicarbonate concentrations (−0.9 ± 0.8 mmol·L−1) were depressed at 120 minutes compared with those at 105 minutes, baseline and half time (all p ≤ 0.05). There were no significant correlations between changes in acid-base balance and sprint speed (all 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
Number of pages8
JournalJournal of Strength and Conditioning Research
Volume30
Issue number6
DOIs
Publication statusPublished - Jun 2016
Externally publishedYes

Fingerprint

Soccer
Acid-Base Equilibrium
Bicarbonates
Lactic Acid
Acidosis
Fatigue
Research

Cite this

Harper, Liam D. ; Clifford, Tom ; Briggs, Marc A. ; McNamee, Ged ; West, Daniel J. ; Stevenson, Emma ; Russell, Mark. / The Effects of 120 Minutes of Simulated Match Play on Indices of Acid-Base Balance in Professional Academy Soccer Players. In: Journal of Strength and Conditioning Research. 2016 ; Vol. 30, No. 6. pp. 1517-1524.
@article{a0ce77e0031347689b7dacf64889a48d,
title = "The Effects of 120 Minutes of Simulated Match Play on Indices of Acid-Base Balance in Professional Academy Soccer Players",
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). Blood pH (−0.03 to −0.04 units), base excess (−0.95 to −1.48 mmol·L−1), and bicarbonate concentrations (−0.9 ± 0.8 mmol·L−1) were depressed at 120 minutes compared with those at 105 minutes, baseline and half time (all p ≤ 0.05). There were no significant correlations between changes in acid-base balance and sprint speed (all 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.",
keywords = "Extra-time, Fatigue, Football, Intermittent, Buffer, Skill",
author = "Harper, {Liam D.} and Tom Clifford and Briggs, {Marc A.} and Ged McNamee and West, {Daniel J.} and Emma Stevenson and Mark Russell",
year = "2016",
month = "6",
doi = "10.1519/JSC.0000000000001271",
language = "English",
volume = "30",
pages = "1517--1524",
journal = "Journal of Strength and Conditioning Research",
issn = "1064-8011",
publisher = "NSCA National Strength and Conditioning Association",
number = "6",

}

The Effects of 120 Minutes of Simulated Match Play on Indices of Acid-Base Balance in Professional Academy Soccer Players. / Harper, Liam D.; Clifford, Tom; Briggs, Marc A.; McNamee, Ged; West, Daniel J.; Stevenson, Emma; Russell, Mark.

In: Journal of Strength and Conditioning Research, Vol. 30, No. 6, 06.2016, p. 1517-1524.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The Effects of 120 Minutes of Simulated Match Play on Indices of Acid-Base Balance in Professional Academy Soccer Players

AU - Harper, Liam D.

AU - Clifford, Tom

AU - Briggs, Marc A.

AU - McNamee, Ged

AU - West, Daniel J.

AU - Stevenson, Emma

AU - Russell, Mark

PY - 2016/6

Y1 - 2016/6

N2 - 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). Blood pH (−0.03 to −0.04 units), base excess (−0.95 to −1.48 mmol·L−1), and bicarbonate concentrations (−0.9 ± 0.8 mmol·L−1) were depressed at 120 minutes compared with those at 105 minutes, baseline and half time (all p ≤ 0.05). There were no significant correlations between changes in acid-base balance and sprint speed (all 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.

AB - 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). Blood pH (−0.03 to −0.04 units), base excess (−0.95 to −1.48 mmol·L−1), and bicarbonate concentrations (−0.9 ± 0.8 mmol·L−1) were depressed at 120 minutes compared with those at 105 minutes, baseline and half time (all p ≤ 0.05). There were no significant correlations between changes in acid-base balance and sprint speed (all 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.

KW - Extra-time

KW - Fatigue

KW - Football

KW - Intermittent

KW - Buffer

KW - Skill

UR - http://journals.lww.com/nsca-jscr/pages/default.aspx

U2 - 10.1519/JSC.0000000000001271

DO - 10.1519/JSC.0000000000001271

M3 - Article

VL - 30

SP - 1517

EP - 1524

JO - Journal of Strength and Conditioning Research

JF - Journal of Strength and Conditioning Research

SN - 1064-8011

IS - 6

ER -