Browsing by Author "Oliveira, Rafael"
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- Acute and chronic workload ratios of perceived exertion, global positioning system, and running-based variables between starters and non-starters: a male professional team studyPublication . Nobari, Hadi; Alijanpour, Nader; Martins, Alexandre Duarte; Oliveira, RafaelThe study aim was 2-fold (i) to describe and compare the in-season variations of acute: chronic workload ratio (ACWR) coupled, ACWR uncoupled, and exponentially weighted moving average (EWMA) through session-rated perceived exertion (s-RPE), total distance (TD), high-speed running distance (HSRD), and sprint distance across different periods of a professional soccer season (early, mid, and end-season) between starters and non-starters; (ii) to analyze the relationship the aforementioned measures across different periods of the season for starters and non-starters. Twenty elite soccer players (mean±SD age, 29.4±4.4 y; height, 1.8±0.1m; and body mass, 74.8±2.3kg). They were divided into starter and non-starter groups and were evaluated for 20weeks. ACWR had general changes throughout the season. At the beginning and end of the mid-season, the highest ACWR was observed in three parameters: s-RPE, TD, and HSRD. ACWR and EWMA through sprint distance were higher at the beginning of the early-season than at any other time of the season. The ACWR coupled of s-RPE shows a significant higher value for non-starters than starters (p=0.015; g=−1.01 [−1.98, −0.09]) and the ACWR coupled of TD shows a significant higher value for starters than non-starters in early-season (p<0.01; g=3.01 [1.78, 4.46]) and shows a significant higher value for non-starters than starters in mid-season (p<0.01; g=−2.52 [−3.83, −1.39]), and end-season (p<0.01; g=−2.57 [−3.89, −1.43]). While the EWMA of TD shows a significant higher value for starters than non-starters in early season (p<0.01; g=2.25 [1.17, 3.49]) and mid-season (p<0.01; g=2.42 [1.31, 3.71]), and shows a significant higher value for non-starters than starters in end-season (p<0.01; g=−2.23 [−3.47, −1.16]). Additionally, we found some correlations between external and internal load measures during three periods of the in-season. The study’s main finding was that the indexes of ACWR and EWMA were useful to detect differences between period and between playing status with the exception for the sprint variable. In addition, the necessary work for non-starter players’ improvement is not done during training, and these players lose their readiness as the season progresses. Consequently, these players perform poorly during the match. Therefore, coaches and their staff should consider devising new activities to keep non-starter players physically fit. This deficit must be accounted for in training because they compete in fewer matches and have less burden than starters.
- Acute: chronic workload ratio and training monotony variations over the season in professional soccer: a systematic reviewPublication . Rico-González, Markel; González Fernández, Francisco Tomás; Oliveira, Rafael; Clemente, Filipe ManuelAcute: chronic workload ratio (ACWR) and training monotony have been criticized as injury risk predictors. Therefore, the use of intensity measures should be oriented to understand the variations of intensity across the season. The aim of this systematic review is to summarize the main evidence about the ACWR and training monotony variations over the season in professional soccer players. The search was made in PubMed, SPORTDiscus, and FECYT according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. From the 225 studies initially identified, 27 were fully reviewed, and their outcome measures were extracted and analyzed. Existing literature revealed a variety of designs, ACWR and training monotony ranges, variables assessed and durations of the studies. Overall, the range values for ACWR were 0.4–3.39 AU, while those focused on monotony were 0.49–5.7 AU. Regarding ACWR, the ratios located around 0.85–1.25 could predict lower risk values and ratios around ≥1.50 could predict higher risk values. On the contrary, with respect to training monotony, the ratios are approximately between 0.5 and 2.00 (low values in the preseason and low competition weeks and high values when soccer players are in highly scheduled competition weeks). Nevertheless, ACWR and training monotony methods should be addressed and considered based on their real value before using this indicator to reduce injury risk. In fact, the data did not conclusively define injured and non-injured players. For this reason, utilizing standardized approaches will allow for more precise conclusions about professional soccer players.
- Acute:chronic workload ratio and training monotony variations over the season in youth soccer players: A systematic reviewPublication . Rico-González, Markel; Oliveira, Rafael; González Fernández, Francisco Tomás; Clemente, Filipe ManuelSince acute:chronic workload ratio and training monotony have been criticized as injury risk predictors, the use of inten sity measures should be more oriented to understand the variations of intensity across the season. The aim of this sys tematic review is to summarize the main evidence about the acute:chronic workload ratio and training monotony variations over the season in youth soccer players. The search was made in PubMed, SPORTDiscus, and FECYT (Web of Sciences, CCC, DIIDW, KJD, MEDLINE, RSCI, and SCIELO) according to Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. From the 225 studies initially identified, 13 were fully reviewed, and their outcome measures were extracted and analyzed. Nine analyzed acute:chronic workload ratio, seven analyzed mon otony, and four studies analyzed both acute:chronic workload ratio and monotony. Overall, the range values for acute: chronic workload ratio were 0.58–17.5 AU, while for monotony were 0.83–23.0 AU which showed a higher variability. Few studies showed an association between higher values of acute:chronic workload ratio and/monotony with injury risk or to prevent health problems. These measures could be used to understand the variations of the data through the in season periods. However, caution is necessary due to the scarce studies performed in young soccer players.
- Adaptações fisiológicas ao esforço na gravidez e pós-partoPublication . Brito, João; Oliveira, RafaelA gravidez (gestação) é vista como um fenómeno fisiológico, embora tivesse existido um processo histórico baseado nos sinais e sintomas da gestação que pudesse indicar alguma doença. Apesar disso considera-se a condição fisiológica normal do período gestacional (Ferreira & Nakano, 2001). As adaptações sofridas pela gestante destinam-se a fornecer necessidades de homeostasia e crescimento fetal, sem um comprometimento do bem-estar materno. Sendo assim, todas as transformações que ocorrem na grávida são fisiológicas e não patológicas, produzindo na gestante a capacidade de nutrição e proteção aumentadas para o bebé, aumentando a eficácia das funções corporais (Barron & Lindheimer 1996; Hacker & Moore, 1994). Durante a gestação, o corpo da grávida passa por uma série de adaptações que envolvem vários aparelhos e sistemas, tais como, respiratório, cardíaco, hormonal, ósseo e muscular. Essas alterações são de nível fisiológico e também mecânico. Desse modo, torna-se importante compreender essas alterações para que os profissionais de saúde e do desporto possam intervir proporcionando uma melhoria, bem-estar e qualidade de vida às gestantes (Almeida et al. 2005).
- An analysis of positional generic and individualized speed thresholds within the most demanding phases of match play in the english premier leaguePublication . Kavanagh, Ronan; McDaid, Kevin; Rhodes, David; McDonnell, Jack; Oliveira, Rafael; Morgans, RylandTo analyze the positional distances covered above generic and individualized speed thresholds within the most demanding phases of match play. Categorized by position, 17 English Premier League players’ match data were analyzed over 2 consecutive seasons (2019–20 and 2020–21). The most demanding phases of play were determined using a rolling average across 4 periods of 1, 3, 5, and 10 minutes. Distance covered in the time above the standard speed of 5.5 m/s was analyzed, with individualized metrics based on the maximal aerobic speed (MAS) test data. Results: Central defenders displayed lower values for high-intensity periods when compared with fullbacks, midfielders, and wide midfielders for both generic and individualized metrics. MAS during 1-minute periods was significantly higher for forwards when compared with central defenders (82.9 [18.9] vs 67.5 [14.8] for maximum high-speed running [HSR] and 96.0 [15.9] vs 75.7 [13.8] HSR for maximum MAS activity). The maximum effect size differences between the central midfielders, wide midfielders, and fullbacks for HSR and MAS measures under the maximum HSR criterion was 0.28 and 0.18 for the 1-minute period, 0.36 and 0.19 for the 3-minute period, 0.46 and 0.31 for the 5-minute period, and 0.49 and 0.315 for the 10-minute period. Conclusions: Individualized speed metrics may provide a more precise and comparable measure than generic values. Data appear to be consistent across playing positions except for central defenders. This information may allow practitioners to directly compare individualized physical outputs of non–central defenders during the most demanding phases of play regardless of the players’ positional group. This may provide coaches with important information regarding session design, training load, and fatigue monitoring.
- Analytical and Ecological Approaches to Aerobic and Anaerobic Conditioning in FootballPublication . Morgans, Ryland; Oliveira, Rafael; Oliveira, Rafael; Silva, Rui; Beato, Marco; Bishop, Chris; Turner, AnthonyResearch in professional football has shown that the physical demands of competitive match-play have substantially increased over the last few decades (Carling et al., 2016) as well as the training demands (Oliveira et al., 2022). As such, the role of support staff has developed to provide theoretical, scientific, and practical support to the manager in a variety of areas. These include performance analysis, strength and conditioning, and the integration of technical and tactical elements. The role of fitness and conditioning staff is to have knowledge of scientific literature and analyze performance data to condition and recover players appropriately to deal with the ever-evolving demands of elite football competition.
- Aptidão física e qualidade de vida em indivíduos com deficiência intelectual e de desenvolvimentoPublication . Jacinto, Miguel; Brito, João; Oliveira, Rafael; Martins, Alexandre; Francisco, Ruben; Vitorino, AnabelaA maioria dos indivíduos com Deficiência Intelectual e de Desenvolvimento (DID) adota um estilo de vida sedentária e inativa, tendo consequentemente fraca capacidade funcional e de composição corporal, apresentando uma relação com o seu estado de saúde. Avaliar a composição corporal e averiguar a sua influência com a capacidade funcional/aptidão física, numa população com DID. 16 indivíduos com DID avaliados na composição corporal por bio impedância multifrequência, capacidade funcional e força dos membros inferiores, com recurso a dinamómetro isocinético. Não se verificaram diferenças, na capacidade funcional e nas variáveis da composição corporal, entre grupos com diferentes gras de deficiência. Verificou-se correlações entre o género diferenças significativas, na capacidade funcional e nas variáveis da composição corporal, entre grupos com diferentes graus de deficiência. Verificaram-se correlações entre o género e as variáveis da composição corporal, apresentando o género masculino valores mais favoráveis nas variáveis percentagem de massa gorda (%MG) (r= -0,758; p=0,001), gordura visceral (GV) (r= -0,589; p=0,016), massa celular corporal (MCC) (r= 0,625; p=0,010), água extra celular (AEC) / água corporal total (ACT) (r= -0,607; p=0,013) e no ângulo de fase (AF) a 50khz (r= 0,529; p=0,035). O rácio ACT/massa isenta de gordura (MIG) e o rácio AEC/ACT apresentam valores de indivíduo saudável, respetivamente, 73,26±0,36% e 0.36-0.39%. O AF foi menor no género feminino e nas idades mais avançadas, bem como com o aumento da %MG. O grau de deficiência parece não influenciar a capacidade funcional e as variáveis da composição corporal, nesta amostra. De salientar, o AF que reflete a boa integridade celular relacionado à proporção de AEC e de água intracelular, apresenta valores dentro dos parâmetros normais, ainda que baixos.
- Aptidão Funcional, Equilíbrio e Ocorrência de Quedas em IdososPublication . Brito, João; Bicho, Isabel; Ramos, Liliana; Oliveira, RafaelObjetivo – O objetivo é estudar a relação entre a aptidão física funcional e a ocorrência de quedas em idosos nos últimos 12 meses, controlando para a idade, o índice de massa corporal e a actividade física. Métodos - Participaram 86 indivíduos (♂ n=69, idade, dp, 76,6 ± 7,87 anos; ♀ n=61, idade, dp, idade, 78 ± 9,26 anos). Foram realizadas avaliações: antropométricas, da aptidão física funcional e do equilíbrio. Resultados - A actividade física tem impacto na melhoria da aptidão física funcional e na redução do indíce de massa corporal. Os idosos que praticaram actividade física apresentam valores mais elevados de equilíbrio, o que reduz a probabilidade de ocorrência de quedas. No grupo de idosos sedentários verificou-se uma associação inversa entre o número de quedas e o score alcançado na bateria de testes de equilíbrio. Quanto maior é o valor de score menor é o número de quedas. Uma melhor capacidade funcional relaciona-se com uma menor ocorrência de quedas. Conclusões - A atividade física parece ter efeito na redução do número de quedas, do índice de massa corporal, na melhoria da aptidão física funcional e no equilíbrio.
- Are acute:chronic workload ratios of perceived exertion and running based variables sensible to detect variations between player positions over the season? A soccer team studyPublication . Nobari, Hadi; Arslan, Ersan; Martins, Alexandre Duarte; Oliveira, RafaelBackground: The aim of this study was to describe and compare the in-season variations of acute: chronic workload ratio (ACWR) coupled, uncoupled, and exponentially weighted moving average (EWMA) through session rating of perceived exertion (s-RPE), total distance (TD), high-speed running distance (HSRD) and sprint distance (SPRINT) in three diferent periods of an elite soccer season according to player positions. Methods: Twenty male elite players (age: 29.4±4.4) from an Asian First League team were daily monitored for twenty consecutive weeks during the 2017–2018 in-season. Forty-seven trainings and twenty matches were moni tored using global positioning system units (GPS) to collect TD, HSRD and SPRINT. Through the collection of s-RPE, TD, HSRD, and SPRINT by ACWR and EWMA were calculated for each training session. Results: The results revealed that according to diferent periods of the season, workload measures observed in mid season were meaningfully higher compared with early-season (g=ranging from 0.53 to 4.98) except for EWMASPRINT. In general, wingers and strikers tended to have greater scores in workload measures compared to the defenders and midfelders (g=ranging from 0.41 to 5.42). Conclusions: These fndings may provide detailed information for coaches and sports scientists regarding the vari ations of acute and chronic workload ratio and external loading in-season and between player positions in an elite soccer team
- Are male soccer players accumulating sufficient load across varying microcycle structures? Examining the load, wellness and training/match ratios of a professional teamPublication . Oliveira, Rafael; Canário-Lemos, Rui; Morgans, Ryland; Peixoto, Rafael; Vilaça-Alves, José; BRITO, JOÃO PAULOProfessional soccer involves varying numbers of training sessions and matches each week, which can influence load distribution. Understanding the exact distribution may allow appropriate load periodisation and planning for players. Thus, this study aimed to (i) compare accumulated load and wellness between weeks with different numbers of training sessions and (ii) compare training/match ratio (TMr) of external and internal load between weeks with different numbers of training sessions. Ten players with a minimum of 45 minutes of weekly match-play were analysed over 16 weeks. The microcycle structures consisted of three (3dW), four (4dW), five (5dW) and six (6dW) training sessions plus match-day per week. The following measures were used for analysis: duration, fatigue, quality of sleep, muscle soreness, stress, mood, rating of perceived exertion (RPE), session-RPE (s-RPE), high-speed running distance (HSR), sprint distance (SPD), number of accelerations (ACC) and decelerations (DEC). Accumulated wellness/load were calculated by adding all training and match sessions, while TMr was calculated by dividing accumulated load by match data. The main results showed that accumulated wellness and load were significantly different, with moderate to very large effect sizes, except regarding mood, duration, s-RPE, SPD during 5dW vs. 6dW and s-RPE, HSR, SPD, ACC and DEC during 3dW vs. 4dW (all p > 0.05). Moreover, 6dW was significantly higher than 4dW regarding TMr of duration (p < 0.05, moderate effect size), RPE, HSR and SPD (all p < 0.05 with very large effect sizes) and for 3dW of HSR and ACC (p < 0.05 with very large effect sizes). This study showed that 5dW and 6dW had higher training measures than 3dW or 4dW. Additionally, higher wellness was presented in the microcycles with higher training frequencies. These findings suggest that physical load and wellness were not adjusted according to the number of training sessions within a microcycle.