Variations of training load, monotony, and strain and dose-response relationships with maximal aerobic speed, maximal oxygen uptake, and isokinetic strength in professional soccer players

Filipe Clemente, Cain Clark, Daniel Castillo, Hugo Sarmento, Pantelis Theodoros Nikolaidis, Thomas Rosemann, beat Knechtle

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This study aimed to identify variations in weekly training load, training monotony, and training strain across a 10-week period (during both, pre- and in-season phases); and to analyze the dose-response relationships between training markers and maximal aerobic speed (MAS), maximal oxygen uptake, and isokinetic strength. Twenty-seven professional soccer players (24.9±3.5 years old) were monitored across the 10-week period using global positioning system units. Players were also tested for maximal aerobic speed, maximal oxygen uptake, and isokinetic strength before and after 10 weeks of training. Large positive correlations were found between sum of training load and extension peak torque in the right lower limb (r=0.57, 90%CI[0.15;0.82]) and the ratio agonist/antagonist in the right lower limb (r=0.51, [0.06;0.78]). It was observed that loading measures fluctuated across the period of the study and that the load was meaningfully associated with changes in the fitness status of players. However, those magnitudes of correlations were small-to-large, suggesting that variations in fitness level cannot be exclusively explained by the accumulated load and loading profile.

Original languageEnglish
Article numbere0225522
Number of pages14
JournalPLoS ONE
Issue number12
Publication statusPublished - 4 Dec 2019


Bibliographical note

Copyright: © 2019 Clemente et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and
reproduction in any medium, provided the original author and source are credited.


  • Workload
  • load quantification
  • load monitoring
  • team sports
  • association football

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