Percorrer por autor "Radnor, John"
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- Can different scores in first and second halves influence running and explosive-based measures?Publication . Morgans, Ryland; Radnor, John; Oliver, Jon; Scholten, Jule; Zmijewski, Piotr; Kavanagh, Ronan; Ryan, Ben; Haslam, Chris; King, Matthew; Oliveira, RafaelThis study aimed to examine the influence of different scores in the first and second half on running and explosive-based performance of elite male soccer players. Thirty-three professional players from one English Premier League team participated in the study across two consecutive seasons, 2021/22 and 2022/23. Matches were divided into half (first versus second) and nine phases; WIN-WIN; WIN-DRAW; WIN-LOSS; DRAW-WIN; DRAW-DRAW; DRAW-LOSS; LOSS-WIN; LOSS-DRAW; and LOSS-LOSS. Match physical data were monitored using an 18 Hz Global Positioning System. There was a main effect for half for all variables (p < 0.001–0.008; η2 = 0.004–0.028), with distances covered per minute and number of explosive actions per minute greater in the first-half than second-half (d = 0.144–0.374). There was an interaction effect between half and phase for m/min, high-speed running per min, high metabolic load distance (HMLD) per min, HML efforts/min, and accelerations/min (p < 0.001–0.012; η2 = 0.010–0.015). There was a reduction between first-half and second-half performance during WIN-WIN, WIN-DRAW, DRAW-WIN, DRAW-DRAW, LOSE-WIN, and LOSE-LOSE for m/min (p < 0.001; d = 0.435–0.714), HMLD/min (p < 0.001–0.004; d = 0.334–0.605), and HML efforts/min (p < 0.001; d = 0.408–0.611). In conclusion, our findings emphasise the importance of considering both match half and phase when analysing players’ physical performance to support the prescription of tailored training programs and tactical strategies to optimise performance across different match situations.
- Comparison of running and accelerometry variables based onmatch outcome, match location and quality of opponent in eliteprofessional soccer players. A five-season studyPublication . Morgans, Ryland; Radnor, John; Fonseca, Jose; Rhodes, Dave; Ryan, Ben; King, Matthew; Zmijewski, Piotr; Oliveira, RafaelThe aim of this study was to compare external match load, according to match outcome, match location, and opponent quality across five competitive seasons. Forty-six professional outfield soccer players from the same English Premier League club across the complete 2018/19 to 2022/23 seasons were involved in the study. For each match, the outcome (win, draw, loss), match location (home, away) and quality of opponent (top or bottom six teams, remaining mid-table teams) were recorded. Players covered significantly more m/min and performed more decelerations when playing against the top six compared to mid-table or bottom six teams (p < 0.001; d = 0.213–0.322). There were no differences in external match load depending on match outcome. There were significant opponent×outcome×match location interactions for each position across most of the external match load measures, but these differed in magnitude forspecific metrics and positions(p = 0.001–0.048; d = 0.300–1.741). The present study provided novel information on external match load and the influence of match outcome, match location and opponent quality. This may support and contribute to understanding how to improve training methods to physically prepare players to cope with varying contexts.
- Match running performance is influenced by possession and teamformation in an English Premier League teamPublication . Morgans, Ryland; Radnor, John; Fonseca, Jose; Haslam, Chris; King, Matthew; Rhodes, Dave; Żmijewski, Piotr; Oliveira, RafaelThe aim of this study was to examine the possession (very low, low, high, and very high), team formation (3-5-2 and 4-3-3) and position (centre-backs, full-backs, centre midfielders, attacking midfielders, and centre forwards) on match load across two consecutive seasons in elite soccer. Twenty-seven English Premier League outfield players were recruited. Data was monitored through an 18 Hz Global Positioning System and a 25 Hz semi-automated camera tracking system, respectively, and all variables were analysed per minute. Main effects for formation on total distance (TD) (p = 0.006; η2 = 0.010), high-speed running (HSR) (p = 0.009; η2 = 0.009), number of high metabolic load (HML) efforts (p = 0.004; η2 = 0.011) were observed. In addition, there were significant interaction effects with formation×possession on TD (p < 0.001; η2 = 0.043), HSR (p = 0.006; η2 = 0.018), sprinting (p < 0.001; η2 = 0.030), HML efforts (p < 0.001; η2 = 0.035), accelerations (p < 0.001; η2 = 0.025). From the position-specific analysis, only the running performance of centre-backs was affected by formation or positional factors. These results indicate that formation and possession can have a significant impact on TD, HSR, and HML distance. Furthermore, players performed more high-intensity efforts in 3-5-2 than 4-3-3 formation. These findings suggest that coaches can evaluate running performance in the context of formation and possession and tailor tactical strategies to optimise physical performance.
- Positional training demands in the English Premier League and EnglishChampionship. A longitudinal study across consecutive seasonsPublication . Morgans, Ryland; Ceylan, Ibrahim H.; Radnor, John; Ryan, Ben; King, Matthew; Zmijewski, Piotr; Oliveira, RafaelThe aims of this study were to: compare training loads between the English Premier League (EPL) and English Championship League (ECL) and examine differences between playing positions. Forty-six 1st team players from the same club participated in the study. GPS metrics were obtained during all EPL and ECL training sessions across four consecutive seasons, 2019–20 to 2022–23. The study team was promoted from the ECL at the end of season 2020–21. There was a significant interaction effect between position and league for all GPS metrics (p < 0.001; η2 = 0.001–0.003), except for relative high-speed running (HSR) distance, sprint distance, and sprint efforts (p > 0.05). A significant main effect for league for all GPS metrics (p < 0.001; η2 = 0.001–0.009) was found, with EPL training sessions resulting in greater total distance per minute, HSR distance per minute, high metabolic load distance (HMLD) per minute, number of HML efforts, accelerations, and decelerations per minute compared to training in the ECL (p < 0.001; d = 0.061–0.224). For position, a significant main effect for all GPS metrics (p < 0.001; η2 = 0.001–0.005) was observed. Centre midfielders covered more distance per minute than all other positions (p < 0.001, d = 0.040–0.167). In conclusion, higher training values in the EPL were evident, except for centre forwards, providing some guidance on the differing positional physical demands that may support coaches and practitioners to design position-specific drills incorporating physical and technical/tactical strategies
- “Strength and power are no longer optional”: Contemporary strength and conditioning practice in an English Premier League first teamPublication . Kweon, Daeeun; Morgans, Ryland; Thomas, O.; Oliver, John; Oliveira, Rafael; Ryan, Ben; Radnor, John; Morgans, RylandPurpose: Strength and Conditioning (S&C) coaches play a central role in optimising performance and mitigating injury risk in elite football. Despite this key responsibility, limited research has examined the practical application of S&C within the daily realities of top-tier professional environments. This study explored applied S&C practices within a first-team department of an English Premier League (EPL) football club to generate context-specific insights relevant to practitioners and researchers. Methods: A qualitative research design was employed using semi-structured interviews with five first-team performance and medical staff members. Interviews explored S&C training philosophy and delivery, testing and monitoring approaches, and operational and contextual constraints. All interviews were recorded, transcribed verbatim, and analysed using reflexive thematic analysis. Results: Three overarching themes were identified: (1) Player profiling, (2) Injury prevention, and (3) Challenges in programme S&C delivery. Individualised S&C programming was primarily informed by player profiling and the positional demands. Strength and power were monitored regularly during the season, whereas comprehensive speed profiling was not consistently conducted during the season. Injury prevention strategies were systematic and individualised, integrating screening processes, targeted exercise selection, and load management. Enhancing player education and modifying exercises were key to improving player compliance, but staffing limitations and time pressures restricted the extent of individualised S&C. Conclusion: This study provides novel insights into the applied realities of S&C practice within an EPL first-team environment. While practitioners adopted evidence-informed approaches, practical constraints necessitated ongoing compromise and flexibility. These findings highlight the importance of adaptable, context driven decision-making and demonstrate the value of qualitative inquiry for capturing the complexity of elite football performance settings.
- The positional demands of explosive actions in elite soccer: comparison of English Premier League and French Ligue 1Publication . Morgans, Ryland; Ju, Wonwoo; Radnor, John; Zmijewski, Piotr; Ryan, Ben; Haslam, Chris; King, Matthew; Kavanagh, Ronan; Oliveira, RafaelThe aims of the present study were to: (i) quantify accelerations and decelerations of soccer players during match-play acrosstwo consecutive seasonsfrom the English PremierLeague (EPL) and Ligue 1 (L1); and (ii) compare any positional differences between the two leagues. Fifty-eight male professional soccer players were monitored during all league matches (n = 144) across seasons 2020/21 and 2021/22. The absolute number of accelerations (> +3 m/s−2) and decelerations (< -3 m/s−2) and accelerations and decelerations per minute were examined. The relative number of accelerations and decelerations across all positions was higher with moderate effect sizes in the EPL when compared to L1 (p < 0.001, for both). Significant differences were observed in accelerations and decelerations across all playing positions (p < 0.001 and p = 0.001 respectively, with moderate to very large effect sizes), except for centre forwards (CF) (accelerations p = 0.40; ES = 0.16; decelerations p = 0.97; ES = 0.01). This study provides valuable insights into the positional acceleration and deceleration differences in the EPL and L1, which should be considered in match running performance evaluations. While confirming higher accelerations and decelerations in the EPL, the unique case of CF challenges current evidence, emphasising the need for a more granular understanding of the positional demands of explosive actions incorporating accelerations and decelerations in elite soccer.
- The positional demands of explosive actions in elite soccer: comparison of English Premier League and French Ligue 1Publication . Morgans, Ryland; Ju, Wonwoo; Radnor, John; Zmijewski, Piotr; Ryan, Ben; Haslam, Chris; King, Matthew; Kavanagh, Ronan; Oliveira, RafaelThe aims of the present study were to: (i) quantify accelerations and decelerations of soccer players during match-play acrosstwo consecutive seasonsfrom the English PremierLeague (EPL) and Ligue 1 (L1); and (ii) compare any positional differences between the two leagues. Fifty-eight male professional soccer players were monitored during all league matches (n = 144) across seasons 2020/21 and 2021/22. The absolute number of accelerations (> +3 m/s−2) and decelerations (< -3 m/s−2) and accelerations and decelerations per minute were examined. The relative number of accelerations and decelerations across all positions was higher with moderate effect sizes in the EPL when compared to L1 (p < 0.001, for both). Significant differences were observed in accelerations and decelerations across all playing positions (p < 0.001 and p = 0.001 respectively, with moderate to very large effect sizes), except for centre forwards (CF) (accelerations p = 0.40; ES = 0.16; decelerations p = 0.97; ES = 0.01). This study provides valuable insights into the positional acceleration and deceleration differences in the EPL and L1, which should be considered in match running performance evaluations. While confirming higher accelerations and decelerations in the EPL, the unique case of CF challenges current evidence, emphasising the need for a more granular understanding of the positional demands of explosive actions incorporating accelerations and decelerations in elite soccer.
- The Relative Age Effect across an International Soccer Programme in Male and Female Players Aged 12 Years Old to SeniorsPublication . Morgans, Ryland; Radnor, John; Nisbet, Daniel; Teixeira, Jose; Modric, Toni; Bezuglov, Eduard; Ceylan, Halil İbrahim; Kavanagh, Ronan; Zmijewski, Piotr; Oliveira, RafaelThe purpose of the study was to examine the prevalence of the Relative Age Effect (RAE) across an international soccer programme in male and female players aged 12 years old to seniors. One hundred forty-five male (age: 18.8 ± 4.6 years; body mass: 68.1 ± 10.2 kg; body height: 177.3 ± 10.5 cm) and 218 female (age: 15.9 ± 4.6 years; body mass: 66.2 ± 10.5 kg; body height: 170.6 ± 8.3 cm) players from a National Association were assessed. All participants were divided into four quartiles: January to March (BQ1), April to June (BQ2), July to September (BQ3), and October to December (BQ4). The results showed that the distributions for all male squads were significantly skewed, with more players than expected from BQ1 in the U-21, U-19, and U-17 and less players than expected from BQ4 in the U-19 squad. The distributions for all female squads showed significantly more players than expected from BQ1 in the U-16 and less players than expected from BQ4 in the U-14 squad. The distributions across the different positions for the male squads combined were significantly skewed with more forward players than expected from BQ1 and less forward and midfielder players than expected from BQ4. For the female squads, there were significantly more BQ1 defenders from the U-16 squad than expected. In conclusion, this study unveils significant disparities in quartile distributions among male and female squads. Moreover, the data emphasize the potential impact of heightened physical demands in certain positions on the RAE.