Browsing by Author "Reis, Victor"
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- Can the curriculum be used to estimate critical velocity in young competitive swimmers?Publication . Costa, Aldo; Silva, António; Louro, Hugo; Reis, Victor; Garrido, Nuno; Marques, Mário; Marinho, DanielThe aims of the present study were to assess critical velocity using the swimmer curriculum in front crawl events and to compare critical velocity to the velocity corresponding to a 4 mmol·l-1 of blood lactate concentration and to the velocity of a 30 min test. The sample included 24 high level male swimmers ranged between 14 and 16 years old. For each subject the critical velocity, the velocity corresponding to a 4 mmol·l-1 of blood lactate concentration and the mean velocity of a 30 min test were determined. The critical velocity was also estimated by considering the best performance of a swimmer over several distances based on the swimmer curriculum. Critical velocity including 100, 200 and 400 m events was not different from the velocity of 4 mmol·l-1 of blood lactate concentration. Critical velocity including all the swimmer events was not different from the velocity of a 30 min test. The assessment of critical velocity based upon the swimmer curriculum would therefore seem to be a good approach to determine the aerobic ability of a swimmer. The selection of the events to be included in critical velocity assessment must be a main concern in the evaluation of the swimmer.
- Effects of Backpack Load and Trekking Poles on Energy Expenditure During Field Track WalkingPublication . Brito, João; Garrido, Nuno Domingos; Hopffer Romero, Félix Luís; de Araújo Junior, Adenilson; Reis, VictorThis study evaluates the effects of the use of backpack load and trekking poles on feld track walking energy expenditure. Twenty male volunteer pole walkers (age: 22.70 ± 2.89 years; body mass: 77.90 ± 11.19 kg; height: 1.77 ± 0.06 m; percentage of body fat: 14.6 ± 6.0 %) walked at a self-selected pace on a pedestrian feld track over a period of more than six months. Each subject was examined at random based on four walking conditions: non-poles and non-load, with poles and non-load, nonpoles and with load, with poles and with load. Heart rate, oxygen uptake and energy expenditure were continuously recorded by a portable telemetric system. Non-load walking speed was lower during walking with poles when compared with no poles (p ≤ 0.05). Oxygen uptake, energy expenditure and heart rate varied signifcantly across different conditions. Our results suggest that the use of trekking poles does not influence energy expenditure when walking without an additional load, but it can have an effect during backpack load walking. Moreover, our results indicate that the use of trekking poles may not be helpful to lower the exertion perceived by the subjects when walking with an additional load.
- In-season internal load and wellness variations in professional women soccer players: comparisons between playing positions and statusPublication . Fernandes, Renato; Brito, João; Vieira, Luiz; Martins, Alexandre; Clemente, Filipe; Nobari, Hadi; Reis, Victor; Oliveira, RafaelThe internal intensity monitoring in soccer has been used more in recent years in men's football, however, in women's soccer, the existing literature is still scarce. The aims of this study were threefold: (a) to describe the weekly variations of training monotony (Foster, 1998), training strain and acute:chronic workload ratio (Murray et al., 2017) through session Rated Perceived Exertion (s-RPE); (b) to describe weekly variations of Hooper Index [stress, fatigue, Delayed Onset Muscle Soreness (DOMS) and sleep] (Hooper & Mackinnon, 1995); and (c) to compare those variations between playing positions and player status. Nineteen players (24.1±2.7 years) from a Portuguese BPI League professional team participated in this study. All variables were collected in a 10-week in-season period with 3 training sessions and 1 match per week during the 2019/20 season. Considering the overall team, the results showed that there were some associations between Hooper Index categories and s-RPE like stress or fatigue (0.693, p<0.01), stress or DOMS (0.593, p<0.01), stress or s-RPE (-0.516, p<0.05) and fatigue or DOMS (0.688, p<0.01). There were no differences between all parameters in playing positions or player status. In conclusion, the study revealed that higher levels of fatigue and DOMS occurs concurrently with better nights of sleep. Moreover, any in-season variations concerning internal load and perceived wellness seems independent of position or status in outfield players. Also, the data showed that the higher the players’ reported stress, the lower the observed s-RPE, thus possible indicating a mutual interference of experienced stress levels on the assimilation of training intensity by women elite soccer players.
- In-season internal load and wellness variations in professional women soccer players: comparisons between playing positions and statusPublication . Fernandes, Renato; Brito, João; Vieira, H.L.P; Martins, Alexandre; Clemente, Filipe; Nobari, Hadi; Reis, Victor; Oliveira, RafaelThe internal intensity monitoring in soccer has been used more in recent years in men's football, however, in women's soccer, the existing literature is still scarce. The aims of this study were threefold: (a) to describe the weekly variations of training monotony (Foster, 1998), training strain and acute:chronic workload ratio (Murray et al., 2017) through session Rated Perceived Exertion (s-RPE); (b) to describe weekly variations of Hooper Index [stress, fatigue, Delayed Onset Muscle Soreness (DOMS) and sleep] (Hooper & Mackinnon, 1995); and (c) to compare those variations between playing positions and player status. Nineteen players (24.1±2.7 years) from a Portuguese BPI League professional team participated in this study. All variables were collected in a 10-week in-season period with 3 training sessions and 1 match per week during the 2019/20 season. Considering the overall team, the results showed that there were some associations between Hooper Index categories and s-RPE like stress or fatigue (0.693, p<0.01), stress or DOMS (0.593, p<0.01), stress or s-RPE (-0.516, p<0.05) and fatigue or DOMS (0.688, p<0.01). There were no differences between all parameters in playing positions or player status. In conclusion, the study revealed that higher levels of fatigue and DOMS occurs concurrently with better nights of sleep. Moreover, any in-season variations concerning internal load and perceived wellness seems independent of position or status in outfield players. Also, the data showed that the higher the players’ reported stress, the lower the observed s-RPE, thus possible indicating a mutual interference of experienced stress levels on the assimilation of training intensity by women elite soccer players.
- In-season Microcycle Quantification of Professional Women Soccer Players – External, Internal and Wellness Measures.Publication . Fernandes, Renato; Ceylan, Halil; Clemente, Filipe Manuel; Brito, João Paulo; Martins, Alexandre; Nobari, Hadi; Reis, Victor; Oliveira, RafaelAlthough there is already some knowledge about the intensity in the women's football match, the knowledge about training is still scarce. Therefore, the aim of this study was to quantify external (locomotor activity) and internal (psychophysiological) intensities, as well as the wellness profile of the typical microcycle from professional female soccer players during the 2019/20 in-season. Ten players (24.6 ± 2.3 years) from an elite Portuguese women soccer team participated in this study. All variables were collected in 87 training session and 15 matches for analysis from the 2019-20 in-season. Global positioning variables such total distance, high-speed running, acceleration, deceleration and player load were recorded as intensity while Rated Perceived Exertion (RPE) and session-RPE were recorded as internal measures. The Hooper Index (HI) was collected as a wellness parameter. The results showed that internal and external intensity measures were greater in matches compared to trainings during the week (match day minus [MD-], MD-5, MD-4, MD-2), p<0.05 with very large effect size (ES). In the same line, higher internal and external intensity values were found in the beginning of the week while the lowest values were found in MD-2 (p0.05). This study confirmed the highest intensity values during MD and the lowest on the training session before the MD (MD-2). Moreover, higher training intensities were found in the beginning of the training week sessions which were then reduced when the MD came close. Wellness parameters showed no variation when compared to intensity measures. This study confirmed the hypothesis regarding internal and external intensity but not regarding wellness.
- Predição do desempenho a partir das características antropométricas, fisiológicas e de força no remoPublication . Silva, Fábio; Brito, João; Reis, VictorIntrodução: O desempenho de remadores no remoergômetro é motivo de curiosidade entre os cientistas. Os modelos de predição podem medir o desempenho no remoergômetro. Neste sentido, as variáveis estudadas foram analisadas como possíveis preditores de desempenho. Objetivo: Desenvolver diferentes modelos de regressão a fim de predizer o desempenho com o uso das variáveis antropométricas composição corporal, consumo máximo de oxigênio e força. Métodos: Vinte remadores participaram do estudo (21,35 ± 0,98 anos). Foram aplicados os testes de consumo máximo de oxigênio, força, 500 m e o exame de absorciometria radiológica de dupla energia. A regressão linear múltipla foi realizada no SPSS 16 para os quatro diferentes modelos de regressão. A confiabilidade dos modelos foi indicada pelo coeficiente de determinação R2 e pelo erro padrão da estimativa (SEE). Resultados: Os modelos de antropometria-potência (R2 = 0,92; SEE = 0,06), VO2 Pico (R2 = 0,88; SEE = 0,07), força-potência (R2 = 0,93; SEE = 0,06) apresentaram predição confiável para o desempenho nos 500 m em remoergômetro, assim como a combinação de todas as variáveis (R2 = 0,94; SEE = 0,08). Conclusão: Feitas essas análises, pode-se assegurar a necessidade desses modelos com o objetivo de complementar a identificação, seleção de talentos e, sobretudo, melhora no desempenho
- Variações das métricas de corrida, acelerações, desacelerações e a sua influência na composição corporal de atletas de futebol feminino profissionalPublication . Fernandes, Renato; Martins, Alexandre; Clemente, Filipe Manuel; Brito, João Paulo; Nobari, Hadi; Reis, Victor; Oliveira, Rafael
- Variations of distance and accelerometry-based GPS measures and their influence on body composition in professional women soccer playersPublication . Fernandes, Renato; Martins, Alexandre Duarte; Clemente, Filipe Manuel; Brito, João; Nobari, Hadi; Reis, Victor; Oliveira, RafaelExternal intensity quantification and body composition assessments across the season allow soccer coaches to adjust the intensity during training sessions, thereby avoiding excessive fatigue and helping players maximize their physical fitness status during matches. Thus, the aims of this study were (1) to describe variations in external intensity periods of distance and accelerometry-based measures across the early and mid-competitive phases and (2) to analyze whether the intensity variations influenced body composition across the 2019/20 competitive season. Ten players from a Portuguese BPI Ligue team (professional league) participated in this study. The participants completed ≥80% of 57 training sessions and 13 matches. The athletes were assessed in three phases (before the start of the season, after 2 months, and after 4 months) for the following variables: body fat mass, soft lean mass, fat-free mass, intracellular water, extracellular water, total body water, and phase angle (50 kHz) through bioelectrical impedance analysis (InBody S10). A 10-Hz GPS device (PlayerTek) was used to collect distance and accelerometry-based measures, which included total distance, high-speed running distance, sprint distance, acceleration, deceleration, and player load. Repeated-measures analysis of covariance (ANCOVA) with GPS-derived measures as covariates or repeated-measures analysis of variance (ANOVA) was used to compare the three moments of assessment. Although the patterns of variables’ responses were not the same as the season progressed, the values of body fat mass, fat-free mass, intracellular water, extracellular water, total body water, ratios of ECW/TBW, ECW/ICW, and phase angle improved. Variations in external intensity measures seem to influence the body composition variables across the season. These results may indicate good adaptations to the training and conditioning strategies managed by the coach and technical staff.