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Clinical Trial
. 2019 Dec 4;14(12):e0225522.
doi: 10.1371/journal.pone.0225522. eCollection 2019.

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 Manuel Clemente  1   2 , Cain Clark  3 , Daniel Castillo  4 , Hugo Sarmento  5 , Pantelis Theodoros Nikolaidis  6 , Thomas Rosemann  7 , Beat Knechtle  7   8
Affiliations
Clinical Trial

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 Manuel Clemente et al. PLoS One. .

Abstract

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.

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Conflict of interest statement

The authors have declared that no competing interests exist.

Figures

Fig 1
Fig 1
(a) Mean (SD) and weekly changes (%) in weekly training load over 10 weeks and (b) within-week load variations (CV%) and between weekly load variations (CV%).
Fig 2
Fig 2
(a) Mean (SD) and weekly changes (%) in weekly training monotony during the 10-week period and (b) within-week monotony variations (CV%) and between-weekly monotony variations (CV%).
Fig 3
Fig 3
(a) Mean (SD) and weekly changes (%) in weekly training strain during the 10-week study period and (b) within-weekly training strain variations (CV%) and between-weekly training strain variations (CV%).
Fig 4
Fig 4. Correlation coefficients (90%CI) of sum of training load (TL), sum of training monotony (TM) and sum of training strain (TS) with % of differences (pre-post) of fitness variables.
See this image and copyright information in PMC

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Grants and funding

The authors received no specific funding for this work.
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