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- Virtual reality gaming in rehabilitation after musculoskeletal injur: user experience pilot studyPublication . Gouveia, Élvio Rúbio; Campos, Pedro; França, Cristiano S.; Rodrigues, Louis M.; Martins, Francisco; França, Cíntia; Gonçalves, Frederica; Teixeira, Fernando; Ihle, Andreas; Gouveia, Bruna R.The purposes of this study were twofold: (1) to describe a new technological solution for the rehabilitation of musculoskeletal injuries based on virtual reality (VR) gaming, and (2) to analyze the variation in rated perceived exertion (RPE) and heart rate (HR) of the participants when undergoing a rehabilitation session based on different VR games. Thirty-seven participants aged 23.7 ± 7.0 years tested during five customized VR games to provide a complete rehabilitation session after a musculoskeletal injury. The results of the Friedman test indicated a statistically significant difference in RPE scale and HR across the five VR games throughout a complete rehabilitation session (χ2 (4, n = 35) = 75.59; p < 0.001 and χ2 (4, n = 35) = 27.75, p < 0.001, respectively). RPE and HR increased significantly from Game 1 to Game 2 (z = –5.16, p < 0.001), from Game 1 to Game 3 (z = – 5.05, p < 0.001), from Game 1 to Game 4 (z = –4.87, p < 0.001), and from Game 1 to Game 5 (z = –3.61, p < 0.001). Moreover, the results showed a high perceived usability of the system, greater intrinsic motivation to perform the rehabilitation exercises, a high level of immersion, and a good experience in the VR gaming environment. Our study stimulates extended intervention programs following up on this immersive virtual reality rehabilitation system to support soccer players recovering from musculoskeletal injuries.
- Relationship between Objective and Subjective Fatigue Monitoring Tests in Professional SoccerPublication . Lourenço, João; Gouveia, Élvio Rúbio; Sarmento, Hugo; Ihle, Andreas; Ribeiro, Tiago; Henriques, Ricardo; Martins, Francisco; França, Cíntia; Ferreira, Ricardo Maia; Fernandes, Luís; Teques, Pedro; Duarte, DanielStudying fatigue is challenging because it is influenced by physiological, psychological, and sociological states. Fatigue can be assessed objectively or subjectively, but the literature has difficulty understanding how an analytical test relates to a response via a questionnaire. Thus, the purpose of this study was to evaluate the relationships between objective fatigue variables (Squat Jump (SJ) and Countermovement Jump (CMJ)) measured on day-2 to the game and subjective fatigue (Rating Perceived Exertion (RPE) measured on day-3 to the game and Hooper Index (HI) measured on day-2). The sample comprised 32 professional football players from the First Portuguese League aged 25.86 ± 3.15 years. The Spearman correlations and regression analyses were used to study the relationships between the variables. The results showed statistically significant (p < 0.05) but small correlations (0.113–0.172) between several objective metrics and the subjective metrics evaluated. In addition, we found two weak models with statistical significance (p < 0.05) between the dependent objective variables (contact time, height, and elasticity index) and the HI (R 2 = 3.7%) and RPE (R 2 = 1.6%). Also, nine statistically significant (p < 0.05) but weak models were observed between the subjective dependent variables (HI and RPE) and contact time (R 2 = 1.8–2.7%), flight time (R 2 = 1.1–1.9%), height (R 2 = 1.2–2.3%), power (R 2 = 1.4%), pace (R 2 = 1.2–2.1%), and elasticity index (R 2 = 1.6%). In conclusion, objective and subjective fatigue-monitoring tests in professional soccer do not measure identical but rather complementary aspects of fatigue, and therefore, both need to be considered to gain a holistic perspective.
- Associations between Age, Body Composition, Balance, and Other Physical Fitness Parameters in Youth SoccerPublication . França, Cíntia; Martins, Francisco; Marques, Adilson; Nascimento, Marcelo de Maio; Ihle, Andreas; Przednowek, Krzysztof; Gouveia, Élvio RúbioIn sports, balance ability has been related to game performance and injury prevention. This study’s aims were twofold: (1) to analyze the balance performance of adolescent soccer players from different age groups; and (2) to examine the relationship between players’ age, body composi tion, balance, and other physical fitness parameters, such as strength and flexibility. In this study, 112 players from the under 15 (U15), under 16 (U16), and under 17 (U17) age groups participated. A one-way analysis of the variance was conducted to investigate differences between groups. Pearson correlations and hierarchical multiple regression were used to explore the relationship between variables. Regarding balance, the older group performed significantly worse in the stability indexes for both legs but significantly better in dynamic balance tests. Height correlated significantly and negatively with balance indicators. Both jumping tasks showed medium to large correlations with the sway indexes (−0.23 > r < −0.51). Although not significantly, body fat negatively affected balance, underlining the importance of monitoring body composition for players’ development. Overall, no substantial relationship was found between static and dynamic balance variables, and therefore, it is crucial to include both as complementary measures while evaluating youngsters’ postural balance.
- System for Estimation of Human Anthropometric Parameters Based on Data from Kinect v2 Depth CameraPublication . Krzeszowski, Tomasz; Dziadek, Bartosz; França, Cíntia; Martins, Francisco; Gouveia, Élvio Rúbio; Przednowek, KrzysztofAnthropometric measurements of the human body are an important problem that affects many aspects of human life. However, anthropometric measurement often requires the applica tion of an appropriate measurement procedure and the use of specialized, sometimes expensive measurement tools. Sometimes the measurement procedure is complicated, time-consuming, and requires properly trained personnel. This study aimed to develop a system for estimating human anthropometric parameters based on a three-dimensional scan of the complete body made with an inexpensive depth camera in the form of the Kinect v2 sensor. The research included 129 men aged 18 to 28. The developed system consists of a rotating platform, a depth sensor (Kinect v2), and a PC computer that was used to record 3D data, and to estimate individual anthropometric parameters. Experimental studies have shown that the precision of the proposed system for a significant part of the parameters is satisfactory. The largest error was found in the waist circumference parameter. The results obtained confirm that this method can be used in anthropometric measurements.
- Body composition variations between injured and non-injured professional soccer playersPublication . Martins, Francisco; França, Cíntia; Henriques, Ricardo; Ihle, Andreas; Przednowek, Krzysztof; Marques, Adilson; Lopes, Helder; Sarmento, Hugo; Gouveia, Élvio RúbioProfessional soccer is characterized by its physical demands, making players’ exposure to high injury risks a growing problem. It is crucial to study the factors associated with injuries in professional soccer. This study aimed to investigate the relationship between age, body composition, and others variables related with the injury profle of professional soccer players of a specifc Portuguese team. Also, it analyzed the impact of the injury profle on soccer’s variations in body fat (BF%), skeletal muscle mass (SMM) and total body water (TBW) throughout the season. The sample comprised 31 male professional soccer players competing in the First Portuguese Soccer League. Older players had a higher prevalence of muscular injuries. Midfelders and forwards showed the highest number of muscular injuries during the season being quadriceps the most afected zone. Considering players’ BF% [Wilks’ Lambda = 0.42, F (7, 23) = 4.61, p= 0.002, r = 0.58], SMM [Wilks’ Lambda = 0.59, F (6, 23) = 2.70, p= 0.039, r = 0.41] and TBW [Wilks’ Lambda = 0.54, F (7, 23) = 2.80, p= 0.029, r = 0.46] there was a substantial main efect for the assessments performed throughout the season and the injury status. Age assumes relevance in explaining the injury profle. The impact of the injury profle on soccer’s variations in BF%, SMM and TBW throughout the season must be analyzed considering the clinical relevance.
- Predictive Modeling of Injury Risk Based on Body Composition and Selected Physical Fitness Tests for Elite Football PlayersPublication . Martins, Francisco; Przednowek, Krzysztof; França, Cíntia; Lopes, Helder; Nascimento, Marcelo de Maio; Sarmento, Hugo; Marques, Adilson; Ihle, Andreas; Henriques, Ricardo; Gouveia, Élvio Rúbio: Injuries are one of the most significant issues for elite football players. Consequently, elite football clubs have been consistently interested in having practical, interpretable, and usable models as decision-making support for technical staff. This study aimed to analyze predictive modeling of injury risk based on body composition variables and selected physical fitness tests for elite football players through a sports season. The sample comprised 36 male elite football players who competed in the First Portuguese Soccer League in the 2020/2021 season. The models were calculated based on 22 independent variables that included players’ information, body composition, physical fitness, and one dependent variable, the number of injuries per season. In the net elastic analysis, the variables that best predicted injury risk were sectorial positions (defensive and forward), body height, sit-and reach performance, 1 min number of push-ups, handgrip strength, and 35 m linear speed. This study considered multiple-input single-output regression-type models. The analysis showed that the most accurate model presented in this work generates an error of RMSE = 0.591. Our approach opens a novel perspective for injury prevention and training monitorization. Nevertheless, more studies are needed to identify risk factors associated with injury prediction in elite soccer players, as this is a rising topic that requires several analyses performed in different contexts.
- Digital health in schools: a systematic reviewPublication . França, Cíntia; Santos, Francisco; Martins, Francisco; Lopes, Helder; Gouveia, Bruna; Gonçalves, Frederica; Campos, Pedro; Marques, Adilson; Ihle, Andreas; Gonçalves, Tatiana; Gouveia, Élvio RúbioWorldwide, the growing digitalization process and increase in smartphone usage have contributed to promoting mobile health (mHealth) services. This study provides an overview of the research targeting the effectiveness of mHealth interventions among children and adolescents in the school environment. A systematic literature review was performed following Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) in the PubMed, Web of Science, and Scopus databases. The results show that physical activity and nutrition are the main intervention topics. Health literacy, mental health, productive health, vaccination rates, and social interaction were also considered in mHealth interventions. Of the 13 studies that remained for analysis, 12 described positive outcomes in at least one health variable after using an mHealth tool. Overall, interventions ranged between four and 24 weeks. Only seven studies managed to have at least 80% of the participants from the baseline until completion. Adding personal information, user interaction, and self-reference comparisons of performance seems crucial for designing successful health digital tools for school-aged children and adolescents.
- Characterization of Static Strength, Vertical Jumping, and Isokinetic Strength in Soccer Players According to Age, Competitive Level, and Field PositionPublication . Gouveia, João Nuno; França, Cíntia; Martins, Francisco; Henriques, Ricardo; Nascimento, Marcelo de Maio; Ihle, Andreas; Sarmento, Hugo; Przednowek, Krzysztof; Martinho, Diogo V.; Gouveia, Élvio Rúbio: Muscular strength is strongly related to speed and agility tasks, which have been described as the most decisive actions preceding goals in the soccer game. This study aimed to characterize the players’ strength indicators and to analyze the variation associated with age, competition level, and positional role. Eighty-three male soccer players from A team (n = 22), B team (n = 17), U-23 (n = 19), and U-19 (n = 25) participated in this study. Handgrip strength was assessed using a hand dynamometer (Jamar Plus+), countermovement jump (CMJ) and the squat jump (SJ) were evaluated using Optojump Next, and a Biodex System 4 Pro Dynamometer was used to assess the isokinetic strength of knee extension/flexion. Team A players showed increased lower-body strength compared to their peers, mainly through their increased vertical jumping capacity (i.e., CMJ and SJ; ps < 0.019), and superior performance in isokinetic assessments (i.e., peak torque, total work, and average power). Overall, older players outperformed their younger peers regarding vertical jumping, static strength, and average power in isokinetic strength (ps < 0.005). This study emphasizes the superior strength levels of professional soccer players compared with their lower-division peers, even after controlling by age. This information is of great value to sports agents and coaches, underlining the need to design and include strength-specific content during soccer training.
- Knee and hip muscle strength of male soccer players from different competitive levelsPublication . França, Cíntia; Martins, Francisco; Przednowek, Krzysztof; Marques, Adilson; Ihle, Andreas; Sarmento, Hugo; Gouveia, Élvio Rúbio; França, Cíntia; Pestana Martins, João Francisco; Marques, Adilson; Ihle, Andreas; Sarmento, Hugo; Gouveia, Élvio RúbioIn soccer, knee and hip muscle strength assessments have been recommended for injury prevention. The aims of this study were threefold: (1) to compare knee and hip muscle strength between professional players competing at different levels; (2) to compare strength performance according to the preferred leg (PL) and the non-preferred leg (NPL); and (3) to compare knee and hip muscle strength performance at two moments of the season. This study included 33 professional soccer players: 13 were in the elite group (EG), and 20 were in the sub-elite group (SEG). Body composition, isokinetic knee strength at 60º/s, and hip adduction strength were assessed at two different moments (M1 and M2). Values of peak torque (PT), peak torque/bodyweight (PT/BW), and the hamstring-to-quadriceps strength ratio (H:Q) for knee extensors (KEs) and knee flexors (KFs) for both legs were used for analysis. The statistical analysis included the Mann-Whitney U and the Wilcoxon Signed Rank tests. At M1, the EG presented a significantly better performance in KF PT/BW and in the squeeze strength test for the PL and the NPL (p 0.01). At M2, the EG performed substantially better in KE PT/BW and KF PT/BW (p 0.01). No substantial strength differences were observed in knee and hip muscle performance between the PL and the NPL. From M1 to M2, significant increases were found in knee strength in both groups (p 0.01). Overall, the EG players outperformed significantly their lower-division peers in strength assessments. The results indicate significant knee and hip muscle strength increases during the season, probably as a response to the exposure to training and competition.
- Lower-body power, body composition, speed, and agility performance among youth soccer playersPublication . França, Cíntia; Gouveia, Élvio; Martins, Francisco; Ihle, Andreas; Henriques, Ricardo; Marques, Adilson; Sarmento, Hugo; Przednowek, Krzysztof; Lopes, Helder; França, Cíntia; Gouveia, Élvio Rúbio; Pestana Martins, João Francisco; Ihle, Andreas; Marques, Adilson; Sarmento, Hugo; Lopes, HelderSpeed and agility have been described as crucial abilities for soccer players. The purpose of this study was to analyze, in detail, the variance in speed and agility tasks explained by lower-body power after controlling for age and body composition. The participants were 96 male soccer players aged 16.1 ± 1.6 years. Body composition (stature, body fat percentage—BF%, body mass, and fat-free mass—FFM), lower-body power (countermovement jump—CMJ, and squat jump—SJ), speed (5-, 10-, and 35 m sprints), and agility (t-test) were assessed. Among body composition parameters, BF% presented the highest number of significant relationships with speed and agility, with the strength of correlations ranging from small (5 m sprint, r = 0.25) to large (35 m sprint, r = 0.52). The strongest correlation coefficient emerged between FFM and the 35 m sprint (r = −0.65). Significant correlations were found between vertical jump performance and the 35 m sprint (CMJ: r = −0.68; SJ: r = −0.69), followed by the t-test (CMJ: r = −0.35; SJ: r = −0.47). The hierarchical multiple regression model could explain 22% to 67% of the variance observed in agility scores and speed. BF% remained the most statistically significant negative predictor of all regression models. The CMJ remained a statistically significant positive predictor of the 35 m sprint (β = −0.581, p ≤ 0.01) after controlling for age and body composition. Integrating programs targeting lower-body power might be important to enhance speed and agility performance in youth soccer. On the other hand, future research based on multidisciplinary approaches to investigate the effects of nutritional strategies in reducing or preventing gains in BF% is still needed, which remained a significant predictor of sprint and agility performance in the final models.
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