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Achraf Ammar, Stephen J. Bailey, Omar Hammouda, Khaled Trabelsi, Nabil Merzigui, Kais El Abed, Tarak Driss, Anita Hökelmann, Fatma Ayadi, Hamdi Chtourou, Adnen Gharbi and Mouna Turki

natural grass (NG) surfaces in official football tournaments. 5 Since this official approval, use of AT has increased exponentially for both training and competition. 6 – 8 Accordingly, an increasing number of research studies have been conducted to assess the influence of playing surface on various

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Jorge López-Fernández, Javier Sánchez-Sánchez, Jorge García-Unanue, José Luis Felipe, Enrique Colino and Leonor Gallardo

In recent years, the third generation artificial turf (AT) systems have become an alternative to natural grass (NG) surfaces, mainly due to the standardization of AT systems under the aegis of international bodies such as the Fédération Internationale de Football Association (FIFA) and the European

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Enrique Colino, Jorge Garcia-Unanue, Leonor Gallardo, Carl Foster, Alejandro Lucia and Jose Luis Felipe

few reporting the SA and VD of running surfaces. When comparing natural grass, artificial turf, and asphalt, they reported that the cost of running on both natural grass and artificial turf was ∼5% higher than on asphalt. As SA and VD values for the 2 grass surfaces were similar and both significantly

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Michael E. Hales and John D. Johnson II

( 2 ): 469 – 478 . PubMed ID: 11796653 doi:10.1152/japplphysiol.01164.2000 10.1152/japplphysiol.01164.2000 11796653 8. Sassi A , Stefanescu A , Menaspa P , Bosio A , Riggo M , Rampinini E . The cost of running on natural grass and artificial turf surfaces . J Strength Cond Res

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Yusuf Köklü, Utku Alemdaroğlu, Hamit Cihan and Del P. Wong

higher internal and external loads. 15 The SSGs were performed on artificial grass soccer pitches in this study. Previous studies have found similar energy expenditures and internal and external loads when playing soccer on artificial grass versus natural grass. 28 – 30 Table 1 Characteristics of Small

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Blake D. McLean, Cloe Cummins, Greta Conlan, Grant Duthie and Aaron J. Coutts

thereby increasing the nonrunning-based activity. All drills were completed on a natural grass rugby league field with players wearing playing footwear. Between each team sport activity, players rested for approximately 5 minutes (always >4 min) before beginning the next activity. • Running: players

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Mohamed S. Fessi, Fayçal Farhat, Alexandre Dellal, James J. Malone and Wassim Moalla

exercises in their standard training. Intermittent exercises were randomly performed in 2 sets at the same time of the day to avoid any effect of circadian rhythms and separated by at least 72 hours to avoid the effects of fatigue. All exercises were performed on the same natural-grass soccer field, and

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Lasse Ishøi, Per Aagaard, Mathias F. Nielsen, Kasper B. Thornton, Kasper K. Krommes, Per Hölmich and Kristian Thorborg

club (Danish Premier League) located in the Greater Copenhagen area during February to March. Sprint performance data were obtained at the club’s enclosed football stadium on heated artificial turf, which showed similar properties as natural grass in relation to sprint performance. 19 Sprint and

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Javier Yanci, Daniel Castillo, Aitor Iturricastillo, Tomás Urbán and Raúl Reina

speeds, accelerations, decelerations, PL, PMP, and COD) was collected for both halves during every official match (N = 42 players with CP, 8 matches, and 62 individual observations). All official matches analyzed were played in the same sports facilities (70 × 50 m, natural grass). Footballers’ external

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Enzo Hollville, Vincent Le Croller, Yoshihiro Hirasawa, Rémi Husson, Giuseppe Rabita and Franck Brocherie

S , Kelly L , Millet GP , Brocherie F . Repeated sprinting on natural grass impairs vertical stiffness but does not alter plantar loading in soccer players . Eur J Appl Physiol . 2011 ; 111 ( 10 ): 2547 – 2555 . PubMed ID: 21369733 doi:10.1007/s00421-011-1884-5 10.1007/s00421