TY  - JOUR
A1  - Saidi, Karim
A1  - Zouhal, Hassane
A1  - Rhibi, Fatma
A1  - Tijani, Jed M.
A1  - Boullosa, Daniel
A1  - Chebbi, Amel
A1  - Hackney, Anthony C.
A1  - Granacher, Urs
A1  - Bideau, Benoit
A1  - Ben Abderrahman, Abderraouf
T1  - 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
JF  - PLOS ONE
N2  - Objectives
The aims of this study were to investigate the effects of a six-week in-season period of soccer 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 intermittent 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 hematological parameters (erythrocytes [M/mm3], hematocrit [%], hemoglobin [g/dl], mean corpuscular volume [fl], mean corpuscular hemoglobin content [pg], and mean hemoglobin concentration [%]) were assessed. Daily ratings of perceived exertion (RPE) were monitored 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 statistically different from T1 to T2. No significant relationships were detected between training load parameters and percentage changes of hematological parameters. However, a significant 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 players’ physical fitness. These changes were not related to hematological parameters, even though significant alterations were detected for selected measures.
KW  - body density
KW  - performance
KW  - exercise
KW  - blood
KW  - hematocrit
KW  - responses
KW  - physiology
KW  - schedule
KW  - recovery
KW  - fatigue
Y1  - 2019
U6  - https://doi.org/10.1371/journal.pone.0219692
SN  - 1932-6203
VL  - 14
IS  - 7
PB  - Public Library of Science
CY  - San Francisco
ER  - 
TY  - JOUR
A1  - Coppalle, Sullivan
A1  - Rave, Guillaume
A1  - Ben Abderrahman, Abderraouf
A1  - Ali, Ajmol
A1  - Salhi, Iyed
A1  - Zouita, Sghaier
A1  - Zouita, Amira
A1  - Brughelli, Matt
A1  - Granacher, Urs
A1  - Zouhal, Hassane
T1  - Relationship of Pre-season Training Load With In-Season Biochemical Markers, Injuries and Performance in Professional Soccer Players
JF  - Frontiers in Physiology
N2  - There is controversy in the literature in regards of the link between training load and injury rate. Thus, the aims of this non-interventional study were to evaluate relationships between pre-season training load with biochemical markers, injury incidence and performance during the first month of the competitive period in professional soccer players.
KW  - elite athletes
KW  - global positioning system
KW  - monitoring
KW  - blood sample
KW  - football
Y1  - 2019
U6  - https://doi.org/10.3389/fphys.2019.00409
SN  - 1664-042X
VL  - 10
PB  - Frontiers Research Foundation
CY  - Lausanne
ER  - 
TY  - GEN
A1  - Coppalle, Sullivan
A1  - Rave, Guillaume
A1  - Ben Abderrahman, Abderraouf
A1  - Ali, Ajmol
A1  - Salhi, Iyed
A1  - Zouita, Sghaier
A1  - Zouita, Amira
A1  - Brughelli, Matt
A1  - Granacher, Urs
A1  - Zouhal, Hassane
T1  - Relationship of Pre-season Training Load With In-Season Biochemical Markers, Injuries and Performance in Professional Soccer Players
T2  - Postprints der Universität Potsdam Humanwissenschaftliche Reihe
N2  - There is controversy in the literature in regards of the link between training load and injury rate. Thus, the aims of this non-interventional study were to evaluate relationships between pre-season training load with biochemical markers, injury incidence and performance during the first month of the competitive period in professional soccer players.
T3  - Zweitveröffentlichungen der Universität Potsdam : Humanwissenschaftliche Reihe - 564 
KW  - football
KW  - global positioning system
KW  - blood sample
KW  - monitoring
KW  - elite athletes
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-436025
IS  - 564
ER  -