FSI Selected Publications of the Week

1. Dose-Response Relationships between Training Load Measures and Physical Fitness in Professional Soccer Players.
Younesi S, Rabbani A, Clemente FM, Silva R, Sarmento H, Figueiredo AJ.

University of Coimbra, Research Unit for Sport and Physical Activity, Faculty of Sport Sciences and Physical Education, 3004-531 Coimbra, Portugal.

This study in 22 professional soccer players found very large relationships between final velocity in a 30-15 intermittent fitness test (VIFT) and final velocity in a Vameval test (Vvameval), but Vvameval showed less sensitivity than VIFT. ∆VIFT had moderate correlations with objective internal and external load measures, while ∆Vvameval showed only unclear relationships with them, although had between large and very large relationships with subjective RPE.

Int J Environ Res Public Health. 2021 Apr 19;18(8):4321. doi: 10.3390/ijerph18084321.


2. Monitoring Accumulated Training and Match Load in Football: A Systematic Review.
Teixeira JE, Forte P, Ferraz R, Leal M, Ribeiro J, Silva AJ, Barbosa TM, Monteiro AM.

Research Centre in Sports Sciences, Health and Human Development, 5001-801 Vila Real, Portugal.

This review on training load monitoring in team sports of 36 full-text articles after screening, concluded that the weekly microcycle presents a high loading variation, that seems to be influenced by the type of week, player’s starting status, playing positions, age group, training mode and contextual variables. However, this weekly microcycle shows a limited variation across a competitive season.

Int J Environ Res Public Health. 2021 Apr 8;18(8):3906. doi: 10.3390/ijerph18083906.


3. Home-Advantage during COVID-19: An Analysis in Portuguese Football League.
Matos R(1)(2), Monteiro D(2)(3), Antunes R(1)(2)(4), Mendes D(1)(2), Botas J(2), Clemente J(2), Amaro N(1)(2).

Life Quality Research Centre (CIEQV), IPSantarém/IPLeiria, 2040-413 Rio Maior, Portugal.

Comparison analysis of the last ten rounds of the Portuguese Football League 2019-2020 season, played without audience due to the Covid-19 pandemic, with the first 24 rounds in same season and across the 3 previous seasons showed no differences in the home advantage influence in the results.

Int J Environ Res Public Health. 2021 Apr 4;18(7):3761. doi: 10.3390/ijerph18073761.


4. Comparative Analysis of Soccer Performance Intensity of the Pre-Post-Lockdown COVID-19 in LaLiga™.
García-Aliaga A, Marquina M, Cordón-Carmona A, Sillero-Quintana M, de la Rubia A, Refoyo-Román I.

Facultad de Ciencias de la Actividad Física y del Deporte (INEF-Sports Department), Universidad Politécnica de Madrid, 28040 Madrid, Spain.

Comparison of the first 11 matches of the 2019-20 LaLiga season (pre-lockdown) with the 11 post-lockdown matches showed higher performance in the pre-lockdown period, including medium-speed running (14.1-21 km/h), high-speed running (21.1-24 km/h), and sprinting speed running distances (>24 km/h). However, the number of accelerations/min and decelerations/min were significantly higher during the post-lockdown period.

Int J Environ Res Public Health. 2021 Apr 1;18(7):3685. doi: 10.3390/ijerph18073685.


5. Is Pre-season Eccentric Strength Testing During the Nordic Hamstring Exercise Associated with Future Hamstring Strain Injury? A Systematic Review and Meta-analysis.
Opar DA, Timmins RG, Behan FP, Hickey JT, van Dyk N, Price K, Maniar N.

School of Behavioural and Health Sciences, Australian Catholic University, Fitzroy, VIC, Australia. David.opar@acu.edu.au.

This systematic review of 6 articles after screening, encompassing 1100 athletes, revealed no significant differences in the performance of the Nordic Hamstrings Exercise NHE in 156 injured participants and the 944 uninjured participants, thus concluding that eccentric knee flexor strength quantified during performance of the NHE during pre-season provides limited information about the occurrence of a future HSI.

Sports Med. 2021 Apr 29. doi: 10.1007/s40279-021-01474-1. Online ahead of print..


6. A 2D video-analysis scoring system of 90° change of direction technique identifies football players with high knee abduction moment.
Della Villa F, Di Paolo S, Santagati D, Della Croce E, Lopomo NF, Grassi A, Zaffagnini S.

Education and Research Department, Isokinetic Medical Group, FIFA Medical Centre of Excellence, Bologna, Italy.

This study in 18 male and 11 female competitive football (soccer) players with a 2D evaluation of a 90° change of direction (COD) consisting in five scoring criteria for limb stability, pelvis stability, trunk stability, shock absorption, and movement strategy, each rated as 0/2 (non-adequate), 1/2 (partially adequate), or 2/2 (adequate), showed a excellent intra-rater and inter-rater reliability. In addition, the Knee Abduction Moment (KAM) measured with gold standard 3D motion analysis was significantly higher for athletes obtaining a 0/2 score compared to those obtaining a 2/2 score in all the sub-criteria and the total score. So, the 2D video-analysis scoring system could be a potential method to identify athletes at high risk of non-contact ACL injury.

Knee Surg Sports Traumatol Arthrosc. 2021 Apr 29. doi: 10.1007/s00167-021-06571-2. Online ahead of print.


7. Kiss goodbye to the ‘kissing knees’: no association between frontal plane inward knee motion and risk of future non-contact ACL injury in elite female athletes.
Nilstad A, Petushek E, Mok KM, Bahr R, Krosshaug T.

Oslo Sports Trauma Research Center, Department of Sports Medicine, Norwegian School of Sport Sciences, Oslo, Norway.

This analysis of frontal plane knee and hip control from 2D videos in single-leg squats and vertical drop jumps with an overhead target in 429 handball and 451 football elite female players at baseline, revealed that none of the variables: lateral pelvic tilt, frontal plane knee projection angle, medial knee position, and side-to-side asymmetry, could discriminate between eventually injured (56) and non-injured (722) athletes, showing that this type of screening is not useful for identifying female individuals at increased risk of non-contact ACL injury.

Sports Biomech. 2021 Apr 28:1-15. doi: 10.1080/14763141.2021.1903541. Online ahead of print.


8. Effect of Early Residual Laxity After Anterior Cruciate Ligament Reconstruction on Long-term Laxity, Graft Failure, Return to Sports, and Subjective Outcome at 25 Years.
Lindanger L, Strand T, Mølster AO, Solheim E, Inderhaug E.

Department of Orthopedics, Haraldsplass Deaconess Hospital, Bergen, Norway.

151 soccer, handball, and basketball players undergoing ACLR using bone-patellar tendon-bone graft, underwent a 6-month, 2 years and 25 years follow-ups that included KT-1000 arthrometer measures. A tight graft TG was defined as <3-mm side-to-side difference between knees (n = 129), and a slightly loose graft SLG as 3 to 5 mm (n = 20). Graft failure was defined as ACL revision surgery, >5-mm side-to-side difference, or anterolateral rotational instability 2+ or 3+. The rate of return to pivoting sports at preinjury level was similar between TG and SLG (40% vs 48%, respectively), but median duration of the sports career (2 vs 6 years), surgical revision (30% vs 6%) and Lysholm knee score ≥84 at 2 and 25 years (78% and 33%, vs 94% and 58%) were significantly worse in SLG, showing that a slightly loose graft at 6 months after ACLR increased the risk of later ACL revision surgery and/or graft failure, reduced the length of the athlete’s sports career, and led to an inferior function.

Am J Sports Med. 2021 Apr;49(5):1227-1235. doi: 10.1177/0363546521990801. Epub 2021 Mar 3.


9. Muscle Damage-Based Recovery Strategies Can Be Supported by Predictive Capacity of Specific Global Positioning System Accelerometry Parameters Immediately a Post-Soccer Match-Load.
Da Silva, CD, Machado, G, Fernandes, AA, Teoldo, I, Pimenta, EM, Marins, JCB, and Garcia, ES

Department of Physical Education, Institute of Life Sciences, Federal University of Juiz de Fora, Governador Valadares, Minas Gerais, Brazil.

This study analyzes a 90-minute match-simulation in 20 university players. Several global positioning system accelerometry (GPS-A) parameters showed moderate to very large correlations with Creatine Kinase CK changes in blood at all time points 0, 2, 4 min, and 24 hours after match, but it was the Average Speed the parameter showing more correlation (r = 0.75 to r = 0.84). Thus, Average Speed can be used practically for predicting CK changes reflecting muscle damage after a football game.

J Strength Cond Res. 2021 May 1;35(5):1410-1418. doi: 10.1519/JSC.0000000000002922.