Browsing by Author "Portella, Daniel Leite"
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- Classification of recovery states in U15, U17, and U19 sub-elite football players: a machine learning approachPublication . Teixeira, José Eduardo; Encarnação, Samuel; Branquinho, Luís; Ferraz, Ricardo; Portella, Daniel Leite; Monteiro, Diogo; Morgans, Ryland; Barbosa, Tiago M.; Monteiro, A.M.; Forte, PedroA promising approach to optimizing recovery in youth football has been the use of machine learning (ML) models to predict recovery states and prevent mental fatigue. This research investigates the application of ML models in classifying male young football players aged under (U)15, U17, and U19 according to their recovery state. Weekly training load data were systematically monitored across three age groups throughout the initial month of the 2019–2020 competitive season, covering 18 training sessions and 120 observation instances. Outfield players were tracked using portable 18-Hz global positioning system (GPS) devices, while heart rate (HR) was measured using 1 Hz telemetry HR bands. The rating of perceived exertion (RPE 6–20) and total quality recovery (TQR 6–20) scores were employed to evaluate perceived exertion, internal training load, and recovery state, respectively. Data preprocessing involved handling missing values, normalization, and feature selection using correlation coefficients and a random forest (RF) classifier. Five ML algorithms [K-nearest neighbors (KNN), extreme gradient boosting (XGBoost), support vector machine (SVM), RF, and decision tree (DT)] were assessed for classification performance. The K-fold method was employed to cross-validate the ML outputs. Results: A high accuracy for this ML classification model (73–100%) was verified. The feature selection highlighted critical variables, and we implemented the ML algorithms considering a panel of 9 variables (U15, U19, body mass, accelerations, decelerations, training weeks, sprint distance, and RPE). These features were included according to their percentage of importance (3–18%). The results were cross-validated with good accuracy across 5-fold (79%). Conclusion: The five ML models, in combination with weekly data, demonstrated the efficacy of wearable device-collected features as an efficient combination in predicting football players’ recovery states.
- Comparison of force variables and dynamic strength index between age groups in elite young Brazilian football goalkeepersPublication . Portella, Daniel Leite; Jatene, Pedro; Silva, Alex O.; Santos, Gustavo S.; Monteiro, Diogo; Teixeira, José Eduardo; Branquinho, Luís; Ferraz, Ricardo; Forte, PedroThe application of muscle force is a determinant of football success as it is inherent to the motor control and sport. The aims of this study are: (1) to describe force variables Isometric Maximal Force (IMF), Concentric Peak Force (CPPF), and Dynamic Strength Index (DSI) in football goalkeepers from different age groups; (2) to compare these variables' behavior between those groups. Methods The sample was formed by 19 youth players (15.97 +/- 1.55 years old) from a first-division Brazilian football team. The CPPF and IMF variables were obtained through the Countermovement jump and isometric squat tests, respectively. For data collection, a force plate (Cefise, Brazil) was used with an acquisition frequency of 600 Hz and mono-axial. The DSI was calculated using the ratio between CPPF and IMF. For data analysis, the sample was separated into clusters by age. After the grouping, a descriptive analysis of the data and a comparison between the groups with p < 0.05. Results The sample was grouped into three groups (GA, GB, and GC) and one of the individuals did not enter the group, totaling 18 individuals in the analyzed sample. The comparison between the ages of the groups showed a significant difference and small and moderate effect size (ES), validating the cluster strategy. The CPPF and IMF variables showed increased values according to chronological age. CPPF showed a significant difference between GA-GB, (ES = very large) GA-GC (ES = very large), and GB-GC (ES = moderate). The IMF variable had significant differences between GA-GB (ES = moderate) and GA-GC (ES = very large). However, DSI showed significant differences only between GA GB (ES = small) and GB-GC (ES = very large). Conclusions The CPPF and IMF variables had constant increases and distinct values with an increase according to age, and this did not occur for DSI. The difference between CPPF and IMF compared to DSI bring to light the variability in dynamics and proportionality between muscular force in the concentric phase and maximal force in the isometric regime during the developmental process over chronological age in soccer goalkeepers.
- Editorial: towards a psychophysiological approach in physical activity, exercise, and sportsPublication . Forte, Pedro; Teixeira, José Eduardo; Portella, Daniel Leite; Monteiro, DiogoIn recent years, a psychophysiological perspective on physical activity, exercise, and sports research has become more popular. Given the strong connections between psychological and physiological aspects, as well as mental fatigue and diseases, psychophysiological and psychological explanations are required. Moreover, human movement and sports performance can also be affected by psychological factors, whereby the regulation of physical capabilities is significantly influenced by the psychophysiological system. It is possible to explain how physical activity and exercise insights are controlled and managed by pacing behavior, decision-making, self-regulation, and effort perception. This Research Topic’s goal was to discuss the theoretical and methodological assumptions of the psychophysiological perspective on physical activity, exercise, and sports. In this research area, technical, tactical, physiological, cognitive, and psychological topics were explored in relation to other aspects that affect sports and exercise performance, while the effects of psychological factors on training and performance needs were evaluated. Training interventions assessing acute and chronic adaptations using evaluation and testing procedures make them one of the most important topics in this Research Topic. Research on sports coaching and its relations with mental health and performance were also welcome and considered, intending to provide recent developments within sports sciences research.
- Editorial: Towards a psychophysiological approach in physical activity, exercise, and sports, volume IIPublication . Forte, Pedro; Teixeira, José Eduardo; Portella, Daniel Leite; Monteiro, DiogoThe critical role of physical activity in fostering physical and mental health and wellbeing has been well-documented across diverse populations and contexts. Recent studies published in leading journals provide compelling evidence of the multifaceted benefits of exercise, from improving physical metrics such as body mass index (BMI) and waist circumference to enhancing mental health and subjective wellbeing. These insights underscore the importance of promoting physical activity as a cornerstone of public health. Health related physical activity was a very important discussed topic during COVID-19 pandemic, and for that reason, it is cleared illuminated the critical intersection between physical activity and mental health. That's in line with the published study in this Research Topic by Tomezzoli et al. on young Italian athletes. The authors revealed the detrimental effects of sports activity limitations on mental health. The enforced inactivity during lockdowns led to increased anxiety, depression, and a sense of loss among children, adolescents, and young adults. This allows to remind the psychological benefits of regular physical activity and the need for robust policies to ensure continued access to sports and recreational activities. However, where and when to do is a critical aspect and environment may play an important role on wellbeing.
- Editorial: Towards a psychophysiological approach in physical activity, exercise, and sports, volume IIIPublication . Forte, Pedro; Teixeira, José Eduardo; Portella, Daniel Leite; Monteiro, Diogo“Towards a psychophysiological approach in physical activity, exercise, and sports-volume III” explores the complex interactions between physical activity, exercise, and psychological factors in various populations and analytical contexts. A recurring theme across studies is the emphasis on how psychological factors, such as anxiety, self-confidence, and attentional control, interact with physiological outcomes like heart rate variability (HRV) and perceived exertion. Key findings include the enhancement of performance through strategic psychological interventions (e.g., mindfulness, positive thinking) and the understanding that physical activity can alleviate mental health symptoms, especially in populations with chronic conditions such as long COVID. The studies also collectively underscore the importance of a holistic approach to optimizing performance in individual and team sports, where psychological wellbeing plays a crucial role in optimizing physical outcomes.