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Ricardo Franco Lima, José M. Palao and Filipe Manuel Clemente

Introduction Volleyball is a non-invasive net sport. Teams perform alternative high-intensity actions of passing a ball and trying to send it to the opponent’s court ( Sheppard et al., 2007 ). The actions that involve jumps and are done near the net (e.g., spike and block) have a higher impact on performance ( Voigt and Vetter, 2003 ). Player’s anthropometry, technique, and vertical jump height are critical for the execution of such actions. For this reason, part of training of volleyball players focuses on the development of one’s jumping ability ( Freitas

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Julen Castellano, David Casamichana and Carlos Lago

. Eds: Reilly T, Lees A, Davis K. and Murphy WJ. London: E. and F. N. Spon, 1988, pp 309-315. Rampinini E, Impellizzeri FM, Castagna C, Coutts AJ, Wisloff U. Technical performance during soccer matches of the Italian Serie A league: effect to fatigue and competitive level. J Sports Sci Med Sport, 2009; 12: 227-233. Rowlinson M, O'Donoghue P. Performance profiles of soccer players in the 2006 UEFA Champions League and the 2006 FIFA World Cup tournaments. In: Science and Football VI. Eds: Reilly T. and Korkusuz AF

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Jorge Vargas, Manuel Loureiro, Pantelis T. Nikolaidis, Beat Knechtle, Lorenzo Laporta, Rui Marcelino and Jose Afonso

et al., 2014 ) or alternative approaches to expertise ( Kulasegaram et al., 2013 ), TIDS programs aim at the early signalling of features suggesting potential for achieving expert performance levels ( Leite et al., 2009 ). The reasoning is that early identification of talent may assist sport systems in providing them with greater support and training conditions from an early stage, hopefully translating into optimal performance later on ( Pankhurst et al., 2013 ). TIDS programs therefore follow a backwards logic: first, they identify the factors behind success at

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Mohsen Shafizadeh, Marc Taylor and Carlos Lago Peñas

References Armatas V, Yiannakos A, Sileloglou P. Relationship between time and goal scoring in soccer games: Analysis of three world cups. Int J Perform Anal Sport , 2007; 7: 48-58 Carling C, Williams MA, Reilly T. Handbook of soccer match analysis: A systematic approach to improving performance , London: Routledge; 2005 Castellano J, Casamichana D, Lago-Penas C. The use of match statistics that discriminate between successful and unsuccessful soccer teams. Journal of Human Kinetics , 2012; 31: 139

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Daniel Castillo, Javier Yanci and Jesús Cámara

., 2007 ). ARs, however, have been shown to run 5–6 km during soccer matches with almost 20% of this distance being covered during high-intensity running ( Krustrup et al., 2009 ) and a HRmean of 77% of their HRmax ( Mallo et al., 2009b ). A number of studies have shown that match officials perform a considerable amount of high-intensity running ( Weston, 2014 ) and it is possible that they may experience fatigue during matches as a consequence. Fatigue has been shown to have a detrimental effect on physical performance ( Weston, 2014 ): distance covered at high

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Jose M. Saavedra, Sveinn Þorgeirsson, Milan Chang, Hafrún Kristjánsdóttir and Antonio García-Hermoso

and the final goal differences. The predictor variables were goals from wing and pivot players ( Gruić et al., 2005 ). Another study by the same authors ( Ohnjec et al., 2008 ) analysed 120 matches in the same championship and found that the predictor variables of performance in each preliminary group (four groups with six teams in each) were different. Only wing shots missed variable was relevant in three out of four studied groups as a predictor variable. Subsequently, in the 2009 World Championship the efficiency (goals per shot) was analysed among all

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Ian Varley, Ryan Lewin, Robert Needham, Robin T. Thorpe and Ross Burbeary

is thought to be due to the high magnitude eccentric muscle loading derived from training and matches (Mohr et al., 2016). It has been shown that various potential fatigue measures do not return to baseline levels up to 72 h following a match ( Ascensão et al., 2008 ). This has led to various recovery strategies being implemented in attempt to hasten player recovery and thus regain optimum performance and reduce susceptibility to fatigue related injuries ( Nédélec et al., 2013 ). Although challenging due to the multi-factorial nature of fatigue ( Thorpe et al

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Marcin Andrzejewski, Beata Pluta and Dariusz Posiadała

short sprints of soccer players. Sportonomics , 1996. 2: 55-58 Kuzora P., Erdmann W.S., Program komputerowy badania gier zespołowych. Materiały Ogólnopolskiej Konferencji, Gdańsk, 5-6 czerwca 1998. Red Erdmann W.S., Centrum Badań Lokomocji AWF-AM, Gdańsk: 163-168 Krustrup P., Mohr M., Ellingsgaard H., Physical demands during an elite female soccer game: importance of training status. Med Sci Sports Exerc , 2005. 37: 1242-1248 Mohr M, Krustrup P, Bangsbo J. Match performance of high

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Petros G. Botonis, Argyris G. Toubekis and Theodoros I. Platanou

the overall performance of a player. In this case a high swimming speed at the lactate threshold or a high speed at a velocity corresponding to blood lactate concentration of 4.0 mmol·l -1 (V4) could be beneficial for the player. Within the men’s match, the high-intensity actions are very common (range between 10-60 times) and each one lasts between 2 to 15 s ( Platanou, 2004 ). These actions are interspersed with lower intensity movements each one lasting less than 20 s ( Platanou, 2004 ). As such, the ability to recover and subsequently reproduce effectively

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Paulo E. Redkva, Mauro R. Paes, Ricardo Fernandez and Sergio G. da-Silva

competitive season ( Chamari et al., 2005 ). Additionally, the strategy of evaluating physical performance in friendly matches with a global positioning system (GPS) is currently a common procedure employed by sports scientists and performance analysts in elite soccer ( Mallo et al., 2015 ). The physical demands imposed on elite players have been extensively documented in recent years ( Bradley et al., 2009 ; Dellal et al., 2011 ; Di Salvo et al., 2007 ; Rampinini et al., 2007 ). The short time that teams have to carry out physiological assessments, as well as the high