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Título
Effects of a six-week period of congested match play on plasma volume variations, hematological parameters, training workload and physical fitness in elite soccer players
Autor
Facultad/Centro
Área de conocimiento
Título de la revista
PLOS ONE
Número de la revista
7
Datos de la obra
Saidi, K.; Zouhal, H.; Rhibi, F.; Tijani, J. M.; Chebbi, A.; Hackney, A. C.; Granacher, U.; Bideau, B.; Ben Abderrahman, A.; Boullosa Álvarez, D. A. (2019). Effects of a six-week period of congested match play on plasma volume variations, hematological parameters, training workload and physical fitness in elite soccer players. PLOS ONE, 14
Editor
Public Library of Science
Fecha
2019
Abstract
[EN] Objectives
The aims of this study were to investigate the effects of a six-week in-season period of soc-
cer training and games (congested period) on plasma volume variations (PV), hematological
parameters, and physical fitness in elite players. In addition, we analyzed relationships
between training load, hematological parameters and players’ physical fitness.
Methods
Eighteen elite players were evaluated before (T1) and after (T2) a six-week in-season period
interspersed with 10 soccer matches. At T1 and T2, players performed the Yo-Yo inter-
mittent recovery test level 1 (YYIR1), the repeated shuttle sprint ability test (RSSA), the
countermovement jump test (CMJ), and the squat jump test (SJ). In addition, PV and hema-
tological parameters (erythrocytes [M/mm3], hematocrit [%], hemoglobin [g/dl], mean cor-
puscular volume [fl], mean corpuscular hemoglobin content [pg], and mean hemoglobin
concentration [%]) were assessed. Daily ratings of perceived exertion (RPE) were moni-
tored in order to quantify the internal training load.
Results
From T1 to T2, significant performance declines were found for the YYIR1 (p<0.001, effect
size [ES] = 0.5), RSSA (p<0.01, ES = 0.6) and SJ tests (p< 0.046, ES = 0.7). However, no
significant changes were found for the CMJ (p = 0.86, ES = 0.1). Post-exercise, RSSA blood
lactate (p<0.012, ES = 0.2) and PV (p<0.01, ES = 0.7) increased significantly from T1 to T2.
A significant decrease was found from T1 to T2 for the erythrocyte value (p<0.002, ES =
0.5) and the hemoglobin concentration (p<0.018, ES = 0.8). The hematocrit percentage rate
was also significantly lower (p<0.001, ES = 0.6) at T2. The mean corpuscular volume, mean
corpuscular hemoglobin content and the mean hemoglobin content values were not statisti-
cally different from T1 to T2. No significant relationships were detected between training
load parameters and percentage changes of hematological parameters. However, a signifi-
cant relationship was observed between training load and changes in RSSA performance
(r = -0.60; p<0.003).
Conclusions
An intensive period of “congested match play” over 6 weeks significantly compromised play-
ers’ physical fitness. These changes were not related to hematological parameters, even
though significant alterations were detected for selected measures.
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