RT info:eu-repo/semantics/article T1 Effects of including endurance and speed sessions within small-sided soccer games periodization on physical fitness A1 Castillo Alvira, Daniel A1 Raya-González, Javier A1 Sarmento, Hugo A1 Clemente, Filipe Manuel A1 Yanci, Javier A1 Castillo, Daniel A1 Clemente, Filipe K1 Association football K1 Performance K1 Drill-based exercises K1 Conditioned games K1 Fitness AB The main aim of this study was to analyse the effects of including additional speed and endurance sessions during small-sided games (SSG) training periodization on physical fitness in professional soccer players. Sixteen outfield players (age = 25.6 ± 7.6 years) who competed in the First Division of a European League participated in this study. Players were randomly assigned to perform only the SSG periodization (G-SSG group) or to add endurance and speed training contents to the SSG (ES-SSG group). Before and after the 6-week experimental period, a Yo-Yo Intermittent Recovery Test level 1 (YYIR1) and a 40 m sprinting test were performed. Rating of perceived exertion (RPE) was also measured after each training session. The G-SSG group showed a large improvement in the YYIR1 performance (p = 0.018–0.028; ES = 0.521–0.576) after the training programme, whereas no significant changes were observed for the ES-SSG group (p = 0.763–1.000; ES = 0.000–0.014). In addition, no significant differences (p > 0.05, ES = 0.005–361, trivial to small) in sprint performance at 5 and 10 m intervals up to 40 m were observed at post-training in comparison to pre-training evaluation in G-SSG and ES-SSG groups. No significant differences (p > 0.05) between groups were observed at baseline in the YYIR1 test. The 6-week SSG training supported with only six endurance and speed training sessions was no more effective than well-organized SSG alone for improving running endurance in professional soccer players. PB Termedia Publishing SN 0860-021X YR 2021 FD 2021 LK https://uvadoc.uva.es/handle/10324/80775 UL https://uvadoc.uva.es/handle/10324/80775 LA eng NO Biology of Sport, 2021, 38, 2, 291-299 NO Producción Científica DS UVaDOC RD 12-ene-2026