Artigos em revistas internacionais - ESDRM
Permanent URI for this collection
Browse
Recent Submissions
- Editorial: Load and wellness monitoring in sports: the relationship between different metricsPublication . Oliveira, Rafael; Brito, João Paulo; González-Fernández, Francisco Tomás; Morgans, RylandEditorial on the Research Topic Load and wellness monitoring in sports: the relationship between different metrics
- Load monitoring and Its Relationship with Healthcare in SportsPublication . Oliveira, Rafael; Brito, João PauloLoad monitoring consists of training/match demand quantification as well as wellness and readiness to maximize the likelihood of optimal athletic performance [1]. The literature divides load into two dimensions: internal and external. Internal load is associated with psychophysiological demands that can be objectively and subjectively measured (e.g., heart rate and rating of perceived exertion, respectively) [2,3]. External load is associated with mechanical/locomotor demands, usually collected by global positioning systems, global navigation satellite systems, local positioning systems, and inertial measurement units that belong to micro-electro-mechanical systems (which provide a combination of 3D accelerometers, 3D gyroscopes, and 3D magnetometers). Despite different technologies, they provide external load measures, such as distances covered at various running speeds, accelerations, decelerations, player load, and others
- Updating exercise testing strategies and exercise prescription protocolsPublication . Oliveira, Rafael; Brito, João PauloThe current special issue provided and constitutes relevant information for fitness professional and exercise physiologists. At the same time, it showed meaningful findings about the online exercise testing procedures (see contributors 15 and 17). In addition, it was observed that there are still several research that uses only one type of exercise, despite the general guidelines of the ACSM recommend more that one type [1]. Furthermore, there is a recommendation for future research include behavior change theories in exercise intervention as suggested by the protocol of the contributor 2. Finally, the present special issue also reinforces more research on specific populations, with different ways to control intensity, more specialized tests, while including training periodization practices as well as behavior changes.
- Active and sham transcranial direct-current stimulation (tDCS) plus core stability on the knee kinematic and performance of the lower limb of the soccer players with dynamic knee valgus; two armed randomized clinical trialPublication . Samakosh, H.M.N; Maktoubian, M.; Doost, S.P.R.; Oliveira, Rafael; Badicu, G.; Al-Mhanna, S.B.; Hassanzadeh, M.; Amadekhiar, P.; Vaskasi, R.R.; Oliveira, RafaelDynamic knee valgus (DKV) is a prevalent risk factor for anterior cruciate ligament (ACL) injuries in soccer players, particularly during noncontact mechanisms. Transcranial direct-current stimulation (tDCS) and core stability exercises have shown promise in enhancing motor control and biomechanical alignment, but their combined effects on DKV remain unexplored. This study aimed to evaluate the efficacy of active versus sham tDCS combined with core stability exercises on knee kinematic alignment and lower limb performance in young male soccer players with DKV. In this double-blind, randomized controlled trial, 42 male soccer players (aged 18–25 years) with DKV were randomly assigned to either an active tDCS group (n = 21) or a sham tDCS group (n = 21). Both groups underwent 8 weeks of core stability exercises (3 sessions/week, 30 minutes/session) preceded by 15 minutes of active (2 mA) or sham tDCS targeting the primary motor cortex (M1). The primary outcome was the frontal plane projection angle (FPPA) during a single-leg landing task, measured using 2D video analysis. Secondary outcomes included vertical jump height and 8-hop test time. Outcomes were assessed at baseline and post-intervention. A 2 × 2 mixed-model ANOVA with Bonferroni-corrected post hoc tests was used for statistical analysis via SPSS27. The active tDCS group showed significantly greater improvements in FPPA (+5.65% vs. +2.26%, p < 0.001, 𝜂p² = 0.82), vertical jump height (+25.30% vs. +10.45%, p < 0.001, 𝜂p² = 0.75), and 8-hop test time (−21.05% vs. −14.27%, p < 0.001, � �p² = 0.68) compared to the sham group. Both groups improved from baseline, but the active tDCS group exhibited larger effect sizes across all outcomes. Active tDCS combined with core stability exercises significantly enhanced knee kinematic alignment and lower limb performance in soccer players with DKV compared to sham tDCS. These findings suggest that neuromodulation, when paired with targeted exercise, is a promising strategy for injury prevention and performance enhancement in athletes. Further research is needed to explore long-term effects and applicability to diverse populations.
- Correlating diurnal variations in peak athleticism with buccalgene expression in youth football playersPublication . Thomas, A.; Wheeler, J.; Bishop, R.; Prato, M.F.G.; Karakuş, O.; Cain, E.; Kana-Ah, A.; Nisbet, D.; Morgans, Ryland; Oliveira, RafaelHourly variations in athletic performance are a well-documentedphysiological phenomenon in individual and team sports includingfootball. Measuring the timing of maximal performance couldpotentially improve performance. Evidence suggests that buccalgene expression correlates with athletic performance, yet this hasnot been studied in sport-specific participants. Therefore, the studyaimed to (A) examine the expression of Per2 and Bmal1 genes in 45youth football players and correlate with countermovement jump(CMJ) performance; (B) investigate the fluctuations in Per2 andBmal1 expression levels and CMJ performance at various timepointsduring a regular training day. CMJ metrics (Reactive Strength Index-Modified, Force at Peak Power, Eccentric Duration, and Peak Power)and gene expression levels were measured in 45 youth footballplayers at 08:30 and 17:30. Exercise timing made a significant dif-ference in each measured performance metric at the individual andsquad level. Thirty-four participants displayed increases in RSI-mod(p < 0.001) over the morning measurements. This contributed to an8% increase in overall squad performance (p = 0.0009), which sig-nificantly correlated to buccal gene expression (R2 = 0.94). Profilingplayer buccal gene expression could inform the timing of trainingand rehabilitation protocols to coincide with maximal athletic per-formance in football, other team sports, and individual sports.
- Treinador-Adjunto e analista na 1ª Divisão Nacional Sub-15. A influência do número e posicionamento das balizas em jogos reduzidos condicionadosPublication . Freitas, Rafael Lanceiro Bernardes; Miguel, MauroO presente relatório descreve o estágio realizado no âmbito do Mestrado em Treino Desportivo – Especialização em Futebol, desenvolvido na Associação Académica de Santarém. A prática dividiu-se entre a função de treinador-adjunto e analista da equipa Sub-15 (1ª Divisão Nacional de Iniciados) e a de treinador principal da equipa Sub-9 (Traquinas). O estágio teve como objetivos principais aplicar conhecimentos teórico-práticos, desenvolver competências técnico-profissionais e realizar investigação científica. A componente prática do estágio permitiu a integração plena na dinâmica dos treinos e competições, com responsabilidades que incluíram o planeamento, operacionalização e análise do treino, elaboração de relatórios de jogo, observação de adversários e aplicação de princípios de treino ajustados aos diferentes escalões etários. Paralelamente, foi conduzido um estudo centrado na influência do número e do posicionamento das balizas em Jogos Reduzidos Condicionados (JRC), com o objetivo de perceber de que forma esses elementos condicionam as ações técnico-táticas dos jogadores, havendo também resultados comparativos entre dois grupos distintos (mais e menos utilizados). Os resultados revelaram que menos balizas potenciam maior número de dribles, enquanto mais balizas favorecem maior frequência de passes progressivos. Verificou-se também uma superioridade quantitativa do grupo 1 em relação ao grupo 2, na maioria das várias tipologias de passe. Conclui-se que a manipulação das balizas influencia o comportamento técnico-tático dos jogadores, destacando a importância do design dos JRC na formação desportiva. O relatório aborda ainda os principais desafios, aprendizagens e reflexões do percurso desenvolvido ao longo da época.
- Comparison of external load during differing microcycle structures across two competitive seasons in elite female portuguese soccer playersPublication . Espada, Mário C.; Santos, Fernando J.; Nalha, Matilde; Zmijewski, Piotr; Morgans, Ryland; Oliveira, Rafael; Brito, João Paulo; FERNANDES, RENATOThis study aimed to: (i) compare the accumulated load between three and four training sessions per week plus a match across two consecutive seasons in elite female soccer players, and (ii) compare the training/match ratio (TMr) of external load. Data from 10 players in each season were analysed during the study period. The microcycle structure of the first season included three training sessions (3dW) and a match per week, while the second season included four training sessions (4dW) plus a match per week. The following measures were used for analysis: duration, total distance, high-speed running distance (HSR,>15 km/h), number of accelerations (ACC,>1–2 m.s−2 [ACC1];>2–3 m.s−2 [ACC2];>3 4 m.s−2 [ACC3];>4m.s−2 [ACC4]) and decelerations (DEC,<1–2m.s−2 [DEC1]; <2–3 m.s−2 [DEC2];< 3–4 m.s−2 [DEC3];< 4m.s−2 [DEC4]). The accumulated load was calculated by summing key metrics for all training sessions and matches, while TMr was calculated by dividing the accumulated load by match data. The main results showed that all variables showed meaningful differences (p<0.05) except for ACC4 and DEC4. Specifically, total distance was higher in 3dW than 4dW (p=0.007), while the remaining variables were higher during 4dW. Moreover, all TMr were higher in 4dW than 3dW (p<0.001 for all variables except for ACC4 and DEC4). As expected, this study showed that adding one training session per week increased accumulated load and TMr for several key variables.
- The professional careers of former portuguese football players: a sociodemographic and professional approachPublication . António Vicente; Teixeira, Eduardo Filipe; de Lima e Cunha Hopffer Romero, Félix Luís; da Conceição Miguel, Mauro; Silva, Carlos; FerreiraIntroduction: The study is aimed to identify sociodemographic and professional characteristics related to the careers of former Portuguese football players. Methodology: The sample consisted of 84 Portuguese former players (48.8 ± 8.2 years old) with at least 8 years of professional experience, who finished their careers between 1988 and 2018. Quantitative data was collected from a validated semi-structure interview guide. Results and Discussion: Former Portuguese players had a career of 15.2 ± 3.1 years with more 6.4 ± 2.2 years of youth federated formation. Significant statistical differences were seen between former players with different competitive levels (t(71)=3.843; p=0.001) and international status (t(82)=-2.740; p=0.008). During their careers, 36% accomplish academic formation and 61.9% pursued technical education. Academic habilitation was statistically significant relationships with competitive level (χ2(1)=9.655; ρ=0.002) and international status (χ2(1)=6.930; ρ=0.008), unlike what happened with technical qualification (p>0.05). The majority of former players marry (83.3%) and have children during the career (82.2%). The divorce rate is 15%. Residential mobility is high (8.1 ± 5.55 years). The professional incomes were considered high or very high and 16.7% of former players developed addictions during their career. Conclusion: Former players with higher competitive levels and international status tend to have longer careers. Conversely, they tend to invest less in academic formation. The results reveals that the football career is brief and presents stress and risk factors, mainly at higher competitive levels. The findings contribute to a better understanding and discussion of the professional careers of former Portuguese football players.
- Contextualized acceleration and deceleration profiles of elite soccer players during English Premier League match-play. The effect of possession, positional demands and opponent rankingPublication . Morgans, Ryland; Mandorino, Mauro; Ryan, Ben; Zmijewski, Piotr; Moreira, Alexandre; Oliveira, RafaelThis study aimed to compare accelerations (ACC) and decelerations (DEC) when in- (IP) and out of-possession (OP) during official English Premier League (EPL) match-play over three consecutive seasons considering playing position, match location and opponent ranking. Match data from 31 male professional soccer players was obtained via an optical tracking system. Playing position significantly influenced ACCIP, DECIP, and DECOP. Ranking difference and match location were significant predictors for DECIP, ACCOP, and DECOP. An increase in ranking difference was associated with higher DECIP. Conversely, in the out-of-possession phase (ACCOP and DECOP), a decrease in these parameters with increasing ranking difference was observed. Regarding match location, positive β coefficients suggested that DECIP, ACCOP, and DECOP values were significantly higher during away matches compared to home matches. A significant interaction (playing position × ranking difference) was reported for DECOP (𝛽 = 0.035, p = 0.013). Interestingly, DECOP actions decreased with increasing ranking difference across all playing positions except for wingers. In conclusion, these findings highlight that distinct contextual factors influence ACC and DEC performance during in- and out-of-possession phases of EPL match-play.
- Does running performance relate to the market value of elite male soccer players? A case study from the FIFA world cupPublication . Kılcı, Abdullah; Koç, Muhammed Emin; Binokay, Hülya; Erdoğan, Ali; Kamiş, Okan; Oliveira, RafaelThe study main aim was to investigate: the relationship between running performances and market values of soccer players playing in the 2022 FIFA World Cup, by playing position and all players; the comparisons by playing position; to analyse the relationship between running metrics and market values of the highest and lowest players ranked players. The relationship between running metrics and market values of 306 soccer players who participated in the tournament and played full time, as well as the 40 players with the highest (n = 20) and lowest (n = 20) market values was analysed. Overall, there was a very weak correlation between market values and total distance (r = 0.149), zone 3 (r = 0.153), zone 4 (r = 0.139), zone 5 (r = 0.160), high-speed runs (r = 0.132), sprints (r = 0.147), and top speed (r = 0.194) for all players (p < 0.05). Defenders showed very weak positive correlation between market values and top speed (r = 0.155, p < 0.05). Midfielders showed weak positive correlations between market values and zone 4 (r = 0.302, p < 0.05) and zone 5 (r = 0.369, p < 0.001), sprints (r = 0.367, p < 0.001), and top speed (r = 0.304, p < 0.05). Forwards showed no correlations (p > 0.05). While there is no significant correlation between running metrics and market value for players with the lowest market value (p > 0.05), there was a moderate negative correlation between total distance (r=-0.577) and zone 2 (r=-0.612) for the 20 players with the highest market value (p < 0.05). Moreover, there was a weak correlation with zone 5 (r = 0.450) and a moderate correlation with the top speed values (r = 0.596) (p < 0.05). Weak correlations between soccer players’ running performance and market values suggest that different running thresholds are important metrics, although other factors (e.g., technical skill, age, national and team club) may influence this relationship. In conclusion, since coaches and scouts aim to recruit relatively talented players within the limits of their budgets, selecting athletes with high aerobic and anaerobic performance, particularly those with a strong high-intensity running profile, can contribute to team success and potentially generate high transfer revenues in the future.