La influencia de la densidad competitiva en el resultado de los equipos en el fútbol de alto nivel. (The influence of a congested football calendar on the results obtained by teams in professional soccer.) by Joaquín Lago Ballesteros, Ezequiel Rey Eiras, Carlos Lago Peñas

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Comment on: “Indirect Assessment of Skeletal Muscle Glycogen Content in Professional Soccer Players Before and After a Match Through a Non-Invasive Ultrasound Technology <em>Nutrients </em>2020, <em>12</em>(4), 971” by Niels Ørtenblad, Joachim Nielsen, Kasper D. Gejl, Harry E. Routledge, James P. Morton, Graeme L. Close, David C. Niemann, Julia L. Bone, Louise M. Burke

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O que pensam os treinadores portugueses da 1ª liga sobre a importância da intervenção psicológica no futebol profissional? What portuguese premier league coaches think about the importance of psychological intervention in professional soccer? by André Neves Barreiros, Júlio Manuel Garganta da Silva, Simão Pedro Fernandes de Freitas, Daniel Fernando Teixeira da Silva Duarte, António Manuel Leal Ferreira Mendonça da Fonseca

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Reply to Comment On: “Indirect Assessment of Skeletal Muscle Glycogen Content in Professional Soccer Players before and after a Match through a Non-Invasive Ultrasound Technology <em>Nutrients</em> 2020, <em>12</em>(4), 971” by Iñigo San-Millán, John C. Hill, Julio Calleja-González

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Analysis of the winning probability and the scoring actions in the American professional soccer championship. [Análisis de la probabilidad de ganar y de las acciones que conducen al gol en la liga americana de fútbol profesional]. by Albert Altarriba-Bartés, M. Luz Calle, Antonio Susín, Bruno Gonçalves, Marc Vives, Jaime Sampaio, Javier Peña

“…Abstract This study aimed to assess the effect of the scoring moment on the conditional probability of winning or losing a professional soccer match, as well as identified the most influential variables contributing to victory in Major League Soccer (MLS), the men’s professional league in the United States. …”
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Existe diferença nos testes de força da dinamometria isocinética entre jogadores profissionais de futebol de campo e de futebol de salão? Are there differences in strength tests using isokinetic dynamometry between field and indoor professional soccer players? by Adriano Barros de Aguiar Leonardi, Mauro Olivio Martinelli, Aires Duarte Junior

“…<br>OBJECTIVE: The objective of this study was to conduct a comparative analysis on isokinetic strength assessments between field and indoor male professional soccer players and correlate the findings with the higher levels of injury risk described in the literature. …”
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Influência do nível competitivo e da posição tática sobre parâmetros de desempenho aeróbio de atletas profissionais de futebol do Brasil Influence of competitive level and tactical position on parameters of aerobic performance in professional soccer athletes from Brazil by Bruno Manfredini Baroni, Ricardo Bertotti Piccoli, Ernesto Cesar Pinto Leal Junior

“…<br>This study aimed to verify the influence of the competitive level and the tactical position on parameters related to aerobic performance of professional soccer players. 453 ergospirometric evaluations were analyzed from soccer professional athletes (42 goalkeepers, 92 full backs, 61 sideways, 174 midfielders and 84 forwards) that acted in four competitive levels: National Championship Series A; Series B; Series C; and State Championship. …”
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Comparison of the physical and physiological demands of friendly matches and different types of preseason training sessions in professional soccer players. [Comparación de las demandas físicas y fisiológicas entre partidos amistosos y diferentes sesiones de entrenamiento del periodo preparatorio en futbolistas profesionales]. by Miguel Ángel Campos-Vázquez, Julen Castellano, Francisco Javier Toscano-Bendala, Adam Owen

“…The aim of this study was to compare the physical and physiological demands of friendly matches (FM) with different types of standard training sessions (TRs) undertaken by professional soccer players. Maximal velocity (MV), relative distance (m/min), distance covered in different high velocity and acceleration-deceleration zones, player load, repeated high intensity efforts and Edwards’ TRIMP were assessed in 15 professional Spanish soccer players across the preseason period. …”
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Análise da suplementação de carboidratos e solução isotônica sobre parâmetros hematológicos e bioquímicos de jogadores profissionais de futebol em condições reais de treinamento El análisis de los suplementos de hidratos de carbono en solución isotónica y parámetros hematológicos y bioquímicos de jugadores profesionales de fútbol en entrenamiento real Analysis of carbohydrate supplementation and isotonic solution hematological and biochemical parameters on professional soccer players in real training by Luciano de Oliveira Siqueira, Jaíse Bortoluzzi, Fabio Zanin, Suellen Savi, Ana Paula Deliberal, Patrícia Castelli Canal, Hugo Tourinho Filho, José Cláudio Fonseca Moreira

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Effects of HarmoKnee Injury Prevention Training Program on Knee Isometric Strength of Young Professional Male Soccer Players by Mostafa Shojaei, Abdolhamid Daneshjoo, Nader Rahnama

“…Keywords: Professional soccer player, Hamstrings, Quadriceps, Isometric…”
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Acute effects of training load on contractile properties during a competitive microcycle in elite soccer players by Ezequiel Rey, Francisco Corredoira, Pablo B. Costa, Alexandra Pérez-Ferreirós, María Fernández-Villarino

“…The aim of this study was to examine changes in muscle contractile properties across a microcycle of training in professional soccer players during the in-season period. …”
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Physiological parameters of professional football players in teams of various levels by Dragutin Stojmenović, Tamara Stojmenović

“…The aim of this study: 1) To analyze the disparities in physiological parameters among professional soccer players in teams of varying levels. 2) To explore potential connections between team ranking positions and the physiological attributes of professional soccer players. …”
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The Moral Gatekeeper: Soccer and Technology, the Case of Video Assistant Referee (VAR) by Ilan Tamir, Michael Bar-eli

“…This paper argues that, despite fierce objections and extensive criticism, VAR represents an important revision in modern professional soccer, and moreover, it completes a moral revolution in the evolution of the sport as a whole. …”
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PPAR&alpha; gene variants as predicted performance-enhancing polymorphisms in professional Italian soccer players by Proia P, Bianco A, Schiera G, Saladino P, Contr&ograve; V, Caramazza G, Traina M, Grimaldi KA, Palma A, Paoli A

“…Methods: Sixty professional soccer players and 30 sedentary volunteers were enrolled in the study. …”
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Influence of warm-up duration on perceived exertion and subsequent physical performance of soccer players by Javier Yanci, Julen Iturri, Daniel Castillo, Marcos Pardeiro, Fabio Y. Nakamura

“…The aim of this study was to analyse the effects of three warm-up protocols with different durations in semi-professional soccer players. Fifteen semi-professional soccer players performed three warmup protocols (Wup 25min : 25 min, Wup 15min : 15 min and Wup 8min : 8 min duration) on three different days. …”
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Estudo comparativo por ressonância magnética de púbis entre atletas e sedentários assintomáticos Comparative study between the pubis of asymptomatic athletes and non-athletes with... by Rodrigo Castelo Branco, César Rubens da Costa Fontenelle, Leandro Marques Miranda, Yonder Archanjo Ching San Junior, Evandro Miguelote Vianna

“…METHODS: Nineteen professional soccer players without complaints of groin pain and seventeen non-athletes, also asymptomatic, underwent pubic magnetic resonance images. …”
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Professional and Elite Young Soccer Players: Differences in Functional Movement ScreenTM Values by Italo Sannicandro, Giacomo Cofano, Rosario D'Onofrio, Andrea Piccinno

“…The sample was subdivided according to their category, resulting in the following subgroups: a) professional soccer players (PSP, n=56,), Under 19 - Primavera (U19, n=29), Under 17 (U17, n=27). …”
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Effects of chronic betaine supplementation on performance in professional young soccer players during a competitive season: a double blind, randomized, placebo-controlled trial by Hadi Nobari, Jason M Cholewa, Alfonso Castillo-Rodríguez, Mehdi Kargarfard, Jorge Pérez-Gómez

“…The aim of this study was to investigate the effect of betaine supplementation on the bio-motor abilities in young professional soccer players. Methods Twenty-nine young professional soccer players (age, 15.5±0.3 years) were matched by position and randomly assigned to one of two groups for 14 weeks: betaine (BG, 2 g/day; n=14) or placebo (PG n=15). …”
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The relationships between relative age effect, personality constructs and achievement level in soccer by Sofie Bolckmans, Kris Perquy, Janet L. Starkes, Daniel Memmert, Werner F. Helsen, Werner F. Helsen

“…Due to RAEs, a significant decrease in the overall quality of professional soccer teams might be observed because of the loss of talent of physically smaller, but psychologically stronger and more versatile relatively young players who possess proper technical and tactical attributes at an early age. …”
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Workload is associated with the occurrence of non-contact injuries in professional male soccer players: A pilot study by Hadi Nobari, Hadi Nobari, Hadi Nobari, Hadi Nobari, Hadi Nobari, Sara Mahmoudzadeh Khalili, Angel Denche Zamorano, Thomas G. Bowman, Urs Granacher

“…Injuries in professional soccer are a significant concern for teams, and they are caused amongst others by high training load. …”
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