Artigos em revistas internacionais - ESDRM
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- Abordagem para a previsão do abandono num ginásioPublication . Sobreiro, Pedro; Santos, AbelEste estudo pretende apresentar um modelo para prever o abandono dos clientes num ginásio, baseado em dados existentes no software de gestão Health Center. As variáveis selecionadas, identificadas de acordo com a sua relevância em estudos realizados e disponibilidade de dados, foram: idade, género, tempo de inscrição, média de visitas mensais, faturação realizada ao cliente, número de aulas frequentadas e distância a percorrer para chegar ao clube. O número de clientes utilizados para a previsão de abandono foram de 810, através da utilização de um algoritmo de Machine Learning Two-class logistic regression para a classificação. A aproximação realizada permitiu prever com uma exatidão de 83% se o cliente abandonava ou ficava no ginásio. Os resultados obtidos sugerem que pode ser vantajoso a utilização da aproximação realizada para prever o abandono e explorar medidas adicionais para contrariar o abandono de clientes em risco.
- 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.
- Adesão e desistência de programas de treino personalizadoPublication . Klain, Ingi Petitemberte; Rombaldi, Airton José; Matos, Dihogo Gama de; Leitão, José; Cid, Luis; Moutão, JoãoEste estudo pretendeu analisar as determinantes (demográficas, indicadores/ perceção de saúde, socioeconómicas e motivacionais) da adesão e desistência de programas de treino personalizado. Fizeram parte da amostra de conveniência adultos de ambos os géneros, oriundos de academias da cidade de Pelotas-Brasil, que ofereciam programas de treinos personalizados, sendo100 praticantes e 42 desistentes. Foram medidas as variáveis género, idade, cor da pele, índice de massa corporal, tabagismo, autoperceção de saúde, situação conjugal e nível socioeconómico. Para avaliar a motivação, foi utilizado o Inventário de Motivação à Prática Regular de Atividade Física, constatando-se que a maioria dos praticantes e desistentes de treino personalizado foram mulheres jovens, de nível socioeconómico elevado. As dimensões consideradas como mais motivadoras para a prática do treino personalizado foram: “Controle de Estresse”, “Saúde”, “Estética” e “Prazer”. Por outro lado, os motivos mais prevalentes para desistência foram a “Falta de Tempo” e a “Falta de Motivação” para a prática.
- Affective responses to resistance exercise: toward a consensus on the timing of assessmentsPublication . Andrade, A.J.; Ekkekakis, P.; Evmenenko, A.; Monteiro, D.; Rodrigues, F.; Cid, Luis; Teixeira, D.S.Tailoring exercise prescriptions aimed at improving affective responses to resistance exercise may promote pleasurable experiences and thus exercise adherence. The purpose of this study was to evaluate different timing protocols for administering rating scales for the assessment of affective valence (Feeling Scale, FS) and perceived activation (Felt Arousal Scale, FAS) during resistance exercise. Thirty-three experienced male exercisers (M = 36.42 ± 7.72 years) completed the FS and FAS at different times at three percentages of one-repetition maximum (%1RM) during two exercises (bench press, squat). No differences emerged among different assessment time points and %1RM. These findings suggest that the post-exercise “affective rebound” phenomenon found in aerobic exercise may not be as pronounced in resistance exercise. Therefore, the results support the use of FS and FAS in resistance exercise, administered immediately after a set, over a wide range of %1RM and exercises. Mounting evidence suggests that the use of these scales in resistance exercise could allow researchers and practitioners to evaluate affective responses that may be important for adherence.
- Age and sex differences in physical activity of portuguese adults and older adultsPublication . Bento, Teresa; Mota, Maria P.; Vitorino, Anabela; Monteiro, Diogo; Cid, Luis; Couto, NunoThis study aims to explore data on objectively measured physical activity from a sample of adults and older adults and to investigate the achievement of the minimum physical activity required for health benefits. Participants, 257 women (age 58.99 ± 18.93 years, BMI 26.75 ± 4.57 kg·m−2 ) and 178 men (age 49.22 ± 20.39 years, BMI 26.81 ± 3.51 kg·m−2 ), wore an accelerometer for 4 to 7 days. Approximately 40% of the time was spent daily in sedentary behaviors during waking hours. Our results do not sustain the suggestion that adult men are more physically active than women. The results indicated a decrease in intensity of physical activity with age, in men and women, but not in successive age groups. Around 75% of adults and 30% of older adults accumulated the minimum daily physical activity for health benefits, in periods shorter than 10 min, above moderate intensity. The number of steps taken per day revealed that most men and women (except the oldest) attained or exceeded the lower threshold for deriving health benefits. To obtain relevant health benefits, future physical activity interventions should aim at reversing the amount of sedentary behaviors, emphasizing increments in, at least, the lower levels of PA, and maintaining walking habits.
- Air ventilation effects during the stationary roller bicycle testPublication . Brito, João; Costa, Aldo; Bento, Pedro; Garrido, Nuno; Reis, Vitor; Conceição, Ana; Louro, HugoProblem Statement: The aim of our study was to analyse the influence of body cooling through fan airflow, in acute physiological responses of elite cyclists during a maximal progressive exercise with four stages. Approach: Nine male cyclists, from the sub-23 and elite category (average age, 26.11 ± 5.11 years-old; average weight, 68.69 ± 7.28 kg; average height, 172.87 ± 3.53 cm) performed, in random order, two discontinued maximum cycling tests with progressive increments: one with fan airflow ~10km/h-1 (~3m.s-1), and the other without it, with an initial load of 150 Watts (W), and an increase of 50 Wevery 6-minute long stage, until exhaustion. In both test conditions, the heart rate (HR), oxygen consumption (VO2), blood lactate concentration [La], tympanic temperature (TT), and rating of perceived exertion (RPE), were measured. Results: When the test conditions were compared, no significant differences were found between the stages for HR and RPE. Significant differences were noted for La, only at the 4th stage of the test (p=0.008). The VO2max was significantly different between the protocols (p=0.004), with significant variations at stage 2 (p=0.033), and 3 (p=0.028). TT was significantly lower (p<0.05) during all the four stages of the protocol. With the exception of HR, all the registered maximum values were significantly different (p>0.05) between the two test conditions and were achieved in the stage in which each subject reached VO2max. Conclusions: The speed of airflow at ~10 km.h-1 does seem to induce significant variations in the acute physiological responses of elite cyclists, as seen during a discontinued maximal progressive cycling test.
- 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.
- An Exploratory Behavioral Study in Children of Four Years of Age on the Hypothesis of a Two Streams System in Touch Perception and Language DevelopmentPublication . Catela, David; Silva, Catarina; Reis, Joana; Seabra, Ana PaulaA two streams system seems to exist for tactile perception. We asked kindergarten children to identify (semantic) and describe the function of grasped unseen instruments of their daily life (fork, knife, spoon, brush, toothbrush, pencil, and scissor), and then, to simulate its use (pragmatic). The capacity to describe the function of the set of instruments was significantly superior to that of identifying them by name, although there was a significant direct association between identification and description of the function in the responses to the set of instruments. The simulation of the instrument function was of two types: (i) use―the child simulated how the instrument is grasped and used; and (ii) incorporation―the child simulated the function of the instrument with her/his own hand. The results support the hypothesis of a two streams tactile system (semantic and pragmatic), and that kindergarten children have the ability to incorporate functional properties of instruments of their daily life, probably as a support for language development.