ESE - Artigos em Revistas Indexados à WoS/Scopus
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Browsing ESE - Artigos em Revistas Indexados à WoS/Scopus by Field of Science and Technology (FOS) "Ciências Sociais::Outras Ciências Sociais"
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- Agreement Between a Wristwatch and a Free Optical Sensor with a Chest Strap in Measuring HR Variations During Front Crawl SwimmingPublication . Bartolomeu, Raúl Filipe; Silva, Vasco; Pereira, Ana; Morais, Gonçalo; Sokołowski, Kamil; Strzała, Marek; Morais, J. E.; Teixeira, José EduardoWearables with optical sensors for heart rate (HR) measurement are widely available in the market. However, their accuracy in water is still underexplored. The aim of the present study was to test the agreement of two different devices for HR monitoring with a chest strap while swimming at different intensities. Twenty male and ten female subjects (mean 19.6 ± 0.7 years old, 173.3 ± 5.4 cm, and 67.1 ± 6.6 kg) performed an intermittent progressive protocol of 3 × 30 s tethered front crawl swimming followed by a 1 min rest period. A chest strap, a wristwatch, and a multi-site optical sensor placed at the temple were used simultaneously. A strong association, an excellent intra-class correlation, and a low mean bias were denoted (R2 = 0.85, ICC = 0.94, b = −1) between HRchest vs. HRtemple. Both indicators increased throughout the test, denoting an increase in accuracy from light to vigorous exercise intensity. HRchest and HRwatch showed a moderate association for the whole test (R2 = 0.23) but a weak association, a poor consistency, and a high mean bias stepwise (0.01 ≤ R2 ≤ 0.06, 0.03 ≤ ICC ≤ 0.42, −48.1 ≤ b≤ −16.1). During swimming, the HR values from the temple showed a better agreement with the chest strap than those from the wristwatch. The temple reading accuracy might be enhanced by using the device during the dryland warm-up routine
- Characterization and Comparison of Athletic Performance and Change of Direction Deficit Across Youth Futsal Age GroupsPublication . Oliveira, João P.; Marinho, Daniel A.; Sampaio, Tatiana; Carvalho, Sílvio; Martins, Hugo; Morais, J. E.Futsal players need peak strength, functional capacity, speed, and explosive lower-limb power for optimal performance. The aim of this study was to (i) characterize and compare anthropometric characteristics, lower limb strength/power, dynamic balance, linear sprint speed, COD performance, and COD deficit across young futsal age groups and (ii) identify key predictors of COD deficit. Methods: Thirty-three male futsal players from three age groups (U13, U15, and U17) were tested. Results: All anthropometric variables showed significant group effects with moderate to strong effect sizes, where U17 presented the largest values, followed by U15 and U13. Strength and power variables presented the same trend. The dynamic balance differed significantly across groups. Significant differences between groups with moderate effect sizes were noted in linear sprints (F = 19.54, p < 0.001, η2 = 0.57), zigzag (F = 19.54, p = 0.002, η2 = 0.35), and COD deficit (F = 19.54, p < 0.001, η2 = 0.46). Post hoc tests revealed that U13 and U15 outperformed U17 in the COD deficit (p < 0.002). The COD deficit showed a quadratic relationship with age, initially improving but later declining in older players (p < 0.001). The body mass and the posteromedial relative difference predicted the COD deficit, with the coefficient of determination (R2) explaining 39% of the COD variance. Conclusions: Coaches and practitioners should utilize COD drills to target various movement patterns and account for pubertal timing, as growth can impact performance
- Impact of a six-week training program on physical fitness and performance of young tennis players: a cluster analysis approachPublication . Oliveira, João P.; Marinho, D.A.; Sampaio, Tatiana; Kilit, Bulent; Morais, J. E.This study aimed to classify young tennis players into sub-groups (clusters) based on their performance and physical fitness determinants and to analyze their cluster assignment change over six weeks of intervention. A sample of young athletes aged 10–14 years was used, and players were classified according to their International Tennis Number (ITN) and various physical fitness metrics after a six-week specific training program. Clusters were also analyzed for cluster assignment changes across pre-test and post-test interventions. The results showed that the performance variables in all clusters improved at the end of the intervention. Specifically, ITN scores improved by an average of 15% (p < 0.05), the 5-m sprint times improved by 8.5% on average (p < 0.01), and the T-drill agility test showed a 10% reduction in completion time (p < 0.01). However, key determinants for cluster formation assessment scores differed, meaning that the training resulted in the physical fitness profiles changing over time. Improvement in 5-m sprint and T-drill agility tests showed that the current program was effective in improving movement characteristics that are vital to a tennis player. Movement between clusters was observed, with some players improving their classification while others regressed, highlighting the need for individualized training interventions to optimize player development. Individualized responses to training are common among young athletes, reflecting varying developmental stages. Clustering can help tailor training programs to the specific needs of different groups. In summary, this study highlights the effects of specific training on young tennis players and emphasizes the necessity of considering individual differences in growth and training responses.
- Improving Motor Competence of Children: The Super Quinas Intervention Program in Portuguese Primary SchoolsPublication . Rodrigues, Luis P.; Cordovil, Rita; Costa, Júlio A.; Seabra, André; Guilherme, José; Vale, Susana; Luz, Carlos; Flôres, Fábio; Lagoa, Maria João; Almeida, Gabriela; Lopes, Vitor P.; Mercê, Cristiana; Esteves, Pedro Tiago; Santos, Sara; Correia, Vanda; Serrano, João; Mendes, Rui; Matos, Rui; Loureiro, Vânia; Neto, CarlosThe objective of this study was to describe the effects of an extra hour of a structured motor program on the motor competence (MC) of children 6–10 years old. The need for movement interventions to enhance MC among school-aged children has gained vital importance in the last years, given the negative secular trends reported. Hence, the Portuguese Football Federation organized an intervention program on MC to be implemented on the extracurricular time of the Portuguese primary schools: the Super Quinas program. Thirty-nine schools from all of Portugal were assigned to intervention and control condition, with a total of 1034 children (6–10 y old) completing all the program (77.7%). The Super Quinas intervention comprised of 1 hour of activity per week, led by a physical educator teacher during extracurricular activities for 12 wees. MC was assessed using the Motor Competence Assessment (MCA) before and at the end of the program (January and April 2023). Normative results of the MCA were used to compare changes between pre and posttest according to experimental or control condition. Results showed a general improvement for all subscales (Locomotor, Manipulative, Stability) and total MCA. More importantly, the experimental group showed significant and positive differences, when compared with the control group, in the Stability Manipulative and total MCA results after controlling for gender, age, and baseline effect. Conclusions: The Super Quinas intervention program proved that adding 1 hour of structured movement program to the regular primary school schedule can lead to greater development of MC in school-age children.
- Kinematic and neuromuscular responses to different visual focus conditions in stand-up paddleboardingPublication . Freitas, João; Conceição, Ana; Stastny, Jan; Morais, J. E.; Marques, Diogo L.; Louro, Hugo; Marinho, Daniel A.; Neiva, Henrique P.This study analyzed the kinematics and muscle activity during the stand-up paddleboarding (SUP) under different visual focus points in three conditions: i) eyes on the board nose, ii) looking at the turn buoy, and iii) free choice. Methods: Fourteen male paddleboarders (24.2 ± 7.1 years) performed three trials covering 65 m, and the electromyographic (EMG) activation patterns and kinematic parameters in four cycle strokes for the left and right sides were analyzed. Surface EMG of the upper trapezius, biceps brachii, triceps brachii, tibialis anterior, and gastrocnemius medialis were recorded. The data were processed according to the percentage of maximum voluntary contraction (%MVC). Speed, stroke frequency (SF), stroke length, and stroke index (SI) were analyzed. Results: The speed, SF, and SI (p < 0.01, η2 ≥ 0.42) showed significant variance between conditions, with the free condition achieving the highest speed (1.20 ± 0.21 m/s), SF (0.65 ± 0.13 Hz) and SI (2.25 ± 0.67 m2 /s). This condition showed greater neuromuscular activity, particularly in the triceps brachii during both the left (42.25 ± 18.76 %MVC) and right recoveries (32.93 ± 16.06 %MVC). During the pull phase, the free choice presented higher biceps brachii activity (8.51 ± 2.80 %MVC) compared to the eyes on the board nose (6.22 ± 2.41 %MVC; p < 0.01), while showing lower activity in the triceps brachii (10.02 ± 4.50 %MVC vs. 16.52 ± 8.45 %MVC; p < 0.01) and tibialis anterior (12.24 ± 7.70 %MVC vs. 17.09 ± 7.73 %MVC; p < 0.01) compared to looking at the turn buoy. Conclusion: These results suggest that a free visual focus allows paddleboarders to enhance their kinematics and muscle activation, highlighting the significance of visual focus strategies in improving both competitive and recreational SUP performance.