TY  - JOUR
A1  - Ramirez-Campillo, Rodrigo
A1  - Alvarez, Cristian
A1  - Garcia-Hermoso, Antonio
A1  - Ramirez-Velez, Robinson
A1  - Gentil, Paulo
A1  - Asadi, Abbas
A1  - Chaabene, Helmi
A1  - Moran, Jason
A1  - Meylan, Cesar
A1  - Garcia-de-Alcaraz, Antonio
A1  - Sanchez-Sanchez, Javier
A1  - Nakamura, Fabio Y.
A1  - Granacher, Urs
A1  - Kraemer, William
A1  - Izquierdo, Mikel
T1  - Methodological characteristics and future directions for plyometric jump training research
BT  - a scoping review
JF  - Sports medicine
N2  - Recently, there has been a proliferation of published articles on the effect of plyometric jump training, including several review articles and meta-analyses. However, these types of research articles are generally of narrow scope. Furthermore, methodological limitations among studies (e.g., a lack of active/passive control groups) prevent the generalization of results, and these factors need to be addressed by researchers. On that basis, the aims of this scoping review were to (1) characterize the main elements of plyometric jump training studies (e.g., training protocols) and (2) provide future directions for research. From 648 potentially relevant articles, 242 were eligible for inclusion in this review. The main issues identified related to an insufficient number of studies conducted in females, youths, and individual sports (~ 24.0, ~ 37.0, and ~ 12.0% of overall studies, respectively); insufficient reporting of effect size values and training prescription (~ 34.0 and ~ 55.0% of overall studies, respectively); and studies missing an active/passive control group and randomization (~ 40.0 and ~ 20.0% of overall studies, respectively). Furthermore, plyometric jump training was often combined with other training methods and added to participants’ daily training routines (~ 47.0 and ~ 39.0% of overall studies, respectively), thus distorting conclusions on its independent effects. Additionally, most studies lasted no longer than 7 weeks. In future, researchers are advised to conduct plyometric training studies of high methodological quality (e.g., randomized controlled trials). More research is needed in females, youth, and individual sports. Finally, the identification of specific dose-response relationships following plyometric training is needed to specifically tailor intervention programs, particularly in the long term.
Y1  - 2018
U6  - https://doi.org/10.1007/s40279-018-0870-z
SN  - 0112-1642
SN  - 1179-2035
VL  - 48
IS  - 5
SP  - 1059
EP  - 1081
PB  - Springer
CY  - Northcote
ER  - 
TY  - GEN
A1  - Arazi, Hamid
A1  - Asadi, Abbas
A1  - Khalkhali, Farhood
A1  - Boullosa, Daniel
A1  - Hackney, Anthony C.
A1  - Granacher, Urs
A1  - Zouhal, Hassane
T1  - Association Between the Acute to Chronic Workload Ratio and Injury Occurrence in Young Male Team Soccer Players
BT  - A Preliminary Study
T2  - Postprints der Universität Potsdam : Humanwissenschaftliche Reihe
N2  - This study aimed to investigate the relationship between the acute to chronic workload ratio (ACWR), based upon participant session rating of perceived exertion (sRPE), using two models [(1) rolling averages (ACWRRA); and (2) exponentially weighted moving averages (ACWREWMA)] and the injury rate in young male team soccer players aged 17.1 ± 0.7 years during a competitive mesocycle. Twenty-two players were enrolled in this study and performed four training sessions per week with 2 days of recovery and 1 match day per week. During each training session and each weekly match, training time and sRPE were recorded. In addition, training impulse (TRIMP), monotony, and strain were subsequently calculated. The rate of injury was recorded for each soccer player over a period of 4 weeks (i.e., 28 days) using a daily questionnaire. The results showed that over the course of the study, the number of non-contact injuries was significantly higher than that for contact injuries (2.5 vs. 0.5, p = 0.01). There were also significant positive correlations between sRPE and training time (r = 0.411, p = 0.039), ACWRRA (r = 0.47, p = 0.049), and ACWREWMA (r = 0.51, p = 0.038). In addition, small-to-medium correlations were detected between ACWR and non-contact injury occurrence (ACWRRA, r = 0.31, p = 0.05; ACWREWMA, r = 0.53, p = 0.03). Explained variance (r 2) for non-contact injury was significantly greater using the ACWREWMA model (ranging between 21 and 52%) compared with ACWRRA (ranging between 17 and 39%). In conclusion, the results of this study showed that the ACWREWMA model is more sensitive than ACWRRA to identify non-contact injury occurrence in male team soccer players during a short period in the competitive season.
T3  - Zweitveröffentlichungen der Universität Potsdam : Humanwissenschaftliche Reihe - 666 
KW  - training load
KW  - rate of perceived exertion
KW  - rolling averages
KW  - weighted moving averages
KW  - football
Y1  - 2020
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-482330
SN  - 1866-8364
IS  - 666
ER  - 
TY  - JOUR
A1  - Arazi, Hamid
A1  - Asadi, Abbas
A1  - Khalkhali, Farhood
A1  - Boullosa, Daniel
A1  - Hackney, Anthony C.
A1  - Granacher, Urs
A1  - Zouhal, Hassane
T1  - Association Between the Acute to Chronic Workload Ratio and Injury Occurrence in Young Male Team Soccer Players
BT  - A Preliminary Study
N2  - This study aimed to investigate the relationship between the acute to chronic workload ratio (ACWR), based upon participant session rating of perceived exertion (sRPE), using two models [(1) rolling averages (ACWRRA); and (2) exponentially weighted moving averages (ACWREWMA)] and the injury rate in young male team soccer players aged 17.1 ± 0.7 years during a competitive mesocycle. Twenty-two players were enrolled in this study and performed four training sessions per week with 2 days of recovery and 1 match day per week. During each training session and each weekly match, training time and sRPE were recorded. In addition, training impulse (TRIMP), monotony, and strain were subsequently calculated. The rate of injury was recorded for each soccer player over a period of 4 weeks (i.e., 28 days) using a daily questionnaire. The results showed that over the course of the study, the number of non-contact injuries was significantly higher than that for contact injuries (2.5 vs. 0.5, p = 0.01). There were also significant positive correlations between sRPE and training time (r = 0.411, p = 0.039), ACWRRA (r = 0.47, p = 0.049), and ACWREWMA (r = 0.51, p = 0.038). In addition, small-to-medium correlations were detected between ACWR and non-contact injury occurrence (ACWRRA, r = 0.31, p = 0.05; ACWREWMA, r = 0.53, p = 0.03). Explained variance (r²) for non-contact injury was significantly greater using the ACWREWMA model (ranging between 21 and 52%) compared with ACWRRA (ranging between 17 and 39%). In conclusion, the results of this study showed that the ACWREWMA model is more sensitive than ACWRRA to identify non-contact injury occurrence in male team soccer players during a short period in the competitive season.
KW  - training load
KW  - rate of perceived exertion
KW  - rolling averages
KW  - weighted moving averages
KW  - football
Y1  - 2020
U6  - https://doi.org/10.3389/fphys.2020.00608
SN  - 1664-042X
VL  - 11
PB  - Frontiers Research Foundation
CY  - Lausanne
ER  - 
TY  - GEN
A1  - Arazi, Hamid
A1  - Asadi, Abbas
A1  - Khalkhali, Farhood
A1  - Boullosa, Daniel
A1  - Hackney, Anthony C.
A1  - Granacher, Urs
A1  - Zouhal, Hassane
T1  - Association Between the Acute to Chronic Workload Ratio and Injury Occurrence in Young Male Team Soccer Players
BT  - A Preliminary Study
T2  - Postprints der Universität Potsdam : Humanwissenschaftliche Reihe
N2  - This study aimed to investigate the relationship between the acute to chronic workload ratio (ACWR), based upon participant session rating of perceived exertion (sRPE), using two models [(1) rolling averages (ACWRRA); and (2) exponentially weighted moving averages (ACWREWMA)] and the injury rate in young male team soccer players aged 17.1 ± 0.7 years during a competitive mesocycle. Twenty-two players were enrolled in this study and performed four training sessions per week with 2 days of recovery and 1 match day per week. During each training session and each weekly match, training time and sRPE were recorded. In addition, training impulse (TRIMP), monotony, and strain were subsequently calculated. The rate of injury was recorded for each soccer player over a period of 4 weeks (i.e., 28 days) using a daily questionnaire. The results showed that over the course of the study, the number of non-contact injuries was significantly higher than that for contact injuries (2.5 vs. 0.5, p = 0.01). There were also significant positive correlations between sRPE and training time (r = 0.411, p = 0.039), ACWRRA (r = 0.47, p = 0.049), and ACWREWMA (r = 0.51, p = 0.038). In addition, small-to-medium correlations were detected between ACWR and non-contact injury occurrence (ACWRRA, r = 0.31, p = 0.05; ACWREWMA, r = 0.53, p = 0.03). Explained variance (r²) for non-contact injury was significantly greater using the ACWREWMA model (ranging between 21 and 52%) compared with ACWRRA (ranging between 17 and 39%). In conclusion, the results of this study showed that the ACWREWMA model is more sensitive than ACWRRA to identify non-contact injury occurrence in male team soccer players during a short period in the competitive season.
T3  - Zweitveröffentlichungen der Universität Potsdam : Humanwissenschaftliche Reihe - 644 
KW  - training load
KW  - rate of perceived exertion
KW  - rolling averages
KW  - weighted moving averages
KW  - football
Y1  - 2020
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-472961
SN  - 1866-8364
IS  - 644
ER  - 
TY  - JOUR
A1  - Arazi, Hamid
A1  - Asadi, Abbas
A1  - Khalkhali, Farhood
A1  - Boullosa, Daniel
A1  - Hackney, Anthony C.
A1  - Granacher, Urs
A1  - Zouhal, Hassane
T1  - Association Between the Acute to Chronic Workload Ratio and Injury Occurrence in Young Male Team Soccer Players
BT  - A Preliminary Study
JF  - Frontiers in Physiology
N2  - This study aimed to investigate the relationship between the acute to chronic workload ratio (ACWR), based upon participant session rating of perceived exertion (sRPE), using two models [(1) rolling averages (ACWRRA); and (2) exponentially weighted moving averages (ACWREWMA)] and the injury rate in young male team soccer players aged 17.1 ± 0.7 years during a competitive mesocycle. Twenty-two players were enrolled in this study and performed four training sessions per week with 2 days of recovery and 1 match day per week. During each training session and each weekly match, training time and sRPE were recorded. In addition, training impulse (TRIMP), monotony, and strain were subsequently calculated. The rate of injury was recorded for each soccer player over a period of 4 weeks (i.e., 28 days) using a daily questionnaire. The results showed that over the course of the study, the number of non-contact injuries was significantly higher than that for contact injuries (2.5 vs. 0.5, p = 0.01). There were also significant positive correlations between sRPE and training time (r = 0.411, p = 0.039), ACWRRA (r = 0.47, p = 0.049), and ACWREWMA (r = 0.51, p = 0.038). In addition, small-to-medium correlations were detected between ACWR and non-contact injury occurrence (ACWRRA, r = 0.31, p = 0.05; ACWREWMA, r = 0.53, p = 0.03). Explained variance (r 2) for non-contact injury was significantly greater using the ACWREWMA model (ranging between 21 and 52%) compared with ACWRRA (ranging between 17 and 39%). In conclusion, the results of this study showed that the ACWREWMA model is more sensitive than ACWRRA to identify non-contact injury occurrence in male team soccer players during a short period in the competitive season.
KW  - training load
KW  - rate of perceived exertion
KW  - rolling averages
KW  - weighted moving averages
KW  - football
Y1  - 2020
U6  - https://doi.org/10.3389/fphys.2020.00995
SN  - 1664-042X
VL  - 11
PB  - Frontiers Research Foundation
CY  - Lausanne
ER  -