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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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Jason Simmons, Nels Popp and Greg Greenhalgh

The outdoor athletic fields of Sunshine State University are in poor condition. Overuse, insufficient drainage, and a lack of human and financial resources have contributed to the fields’ deterioration. Sunshine State University’s director of athletics, Emily Rodriguez, has decided to replace the existing fields, but that decision is just the tip of the iceberg. Rodriguez now must decide on a natural or synthetic surface for the new fields. This decision is complex because cost, maintenance, durability, player safety, and player preference must all be considered. Both surfaces have their advantages and disadvantages. In the end, Rodriguez must decide which surface is right for Sunshine State University.

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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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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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João Ribeiro, Luís Teixeira, Rui Lemos, Anderson S. Teixeira, Vitor Moreira, Pedro Silva and Fábio Y. Nakamura

the right cone (10 m), turn and run back to center cone (5 m), and then run straight back (backpedaling) through the start/finish gate. Both the 30-m sprint and t test were performed on an outdoor field with natural grass, and single-beam infrared timing gates (Wireless TC Timing System; Brower

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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

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Mário A.M. Simim, Gustavo R. da Mota, Moacir Marocolo, Bruno V.C. da Silva, Marco Túlio de Mello and Paul S. Bradley

was quantified immediately after testing using the rating of perceived exertion (RPE) with values ranging from 0 to 10. Figure 1 —Experimental design. GPS = global positioning system. All matches consisted of two 25-min halves with a 10-min rest interval between the halves and were played on a natural

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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