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. 2022 Oct 5;10:e14082. doi: 10.7717/peerj.14082

Table 1. Studies included in the quantitative description of seasonal variations in physical fitness.

Study Sample N (Age) Time points Study Sample N (Age) Time points
PPS BCP MCP ECP PPS BCP MCP ECP
(Aziz, Tan & Teh, 2005) Elite Singapore 41 (25.7) X X X X (Krustrup et al., 2006) 1st & 2nd League Denmark 15–20 (adult) X X X
(Bonuccelli et al., 2012) Elite Italy 10 (26.7) X X X X (Lago-Peñas et al., 2013) Professional Spain 42 (25) X X X
(Boullosa et al., 2013) Elite Spain 12 (24) X X (Link & de Lorenzo, 2016) Professional Germany 428 (adult) X X
(Bradley et al., 2011) Elite Denmark 10 (adult) X X X X (Los Arcos et al., 2015) Professional Spain 14 (20.6) X X
Elite England 15 (U19) X X X X (Malliou et al., 2003) Professional Greece 19 (27.2) X X
(Bunc, Hráský & Skalská, 2015) Elite Czech Republic 45 (21.9) X X X (Manzi et al., 2013) Elite Italy 18 (28.4) X X
(Campos-Vazquez et al., 2016) Professional Spain 12 (27.7) X X (Meckel et al., 2018) Professional Israel 18 (22–32) X X X
(Casajus, 2001) Elite Spain 15 (25.8) X X (Metaxas et al., 2006) Elite Greece 10–12 (18.1–18.2) X X X X
(Castagna et al., 2011) Elite Italy 14 (25) X X (Michalczyk et al., 2008) Professional Poland 19 (26.1) X X
(Castagna et al., 2013) Elite Italy 18 (28.6) X X (Mohr, Krustrup & Bangsbo, 2003) Professional Denamark 10 (26.4) X X X
(Clark et al., 2008) Elite England 10–22 (25) X X X (Mohr, Krustrup & Bangsbo, 2002) Elite Denmark 11 (24.0) X X X
(Clemente et al., 2021) Professional Portugal 25 (28.1) X X (Morgans et al., 2014) Professional England 6 (25.7) X X X
(D’Ascenzi et al., 2013) Professional Italy 23 (26.6) X X X X (Ostojic, 2003) Elite Serbia 30 (23.5) X X X X
(Devlin et al., 2017) Elite Australia 18 (25.5) X X X X (Ostojic et al., 2009) Elite Serbia 12 (25.8) X X
(Dunbar, 2002) Professional England 11 (NS-adults) X X X X (Owen et al., 2018) Elite European 22 (24) X X
(Edwards, Macfadyen & Clark, 2003) Professional England 12 (26.2) X X (Padron-Cabo et al., 2018) Professional Spain 519 (adult) X X X
(Eliakim et al., 2018) Professional Israel 31(NS-adults) X X (Papadakis, Patras & Georgouli, 2015) Professional Greece 10 (23.6) X X X X
(Eniseler et al., 2012) Elite Turkey 14 (25.8) X X (Rampinini et al., 2007b) Professional Italy 20 (26.4) X X X
(Fessi et al., 2016) Professional Qatarl 17 (23.7) X X X (Reinke et al., 2009) Professional Germany 10 (20–36) X X X
(Haritodinis et al., 2004) Elite Greece 12 (25) X X X (Requena et al., 2017) Professional Spain 19 (26.2) X X X
(Iaia et al., 2009b) Professional Denmark 12 (22.4) X X X (Silva et al., 2013b) Professional Portugal 13 (25.7) X X X
(Iga et al., 2014) Professional England 35 (20.4) X X X X (Silva et al., 2011) Professional Portugal 18 (25.7) X X X X
(Kalapotharakos, Ziogas & Tokmakidis, 2011) Elite Greece 12 (25) X X (Suda et al., 2012) Professional Japan 21 (24.7) X X X
(Koundourakis et al., 2014) Professional Greece 22–23 (23.8–25.5) X X X (Zoppi et al., 2006) Professional Brazil 10 (18.2) X X
(Krustrup et al., 2003) Elite Denmark 10 (adult) X X X

Note:

N, sample size; PPS, prior pre-season; BCP, beginning competition phase; MCP, middle competition phase; ECP, end competition phase.