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- Exploratory study on maturation and competition level in young karate practitionersPublication . Branco, Marco A. C.; Brito, Antonio Vences; Seabra, Ana Paula; Mercê, Cristiana; Rodrigues Ferreira, Mário André; Milheiro, Vitor; Catela, DavidEmparelhar crianças propicia sucesso e reduz lesões no desporto. Apesar das diferenças de maturação entre crianças, a idade cronológica mantém-se o principal critério para equalizar os níveis de competição, mas com uma eficiência limitada. No entanto, no karaté, o peso também é considerado. Fomos verificar se existe associação entre a idade cronológica e os indicadores maturacionais e, encontrar modelos simples que permitam colocar em reflexão novas formas de avaliação da maturação. Foram recolhidos dados em 54 jovens praticantes de karaté (idade: 12,67 ± 2,49 anos; experiência: 4,99 ± 2,44 anos; altura: 150,45 ± 15,25cm; peso: 43,09 ± 14,17 kg, 20 raparigas). A idade correlacionou-se significativamente com auto-observação da maturação sexual (rho = 0,838; p < 0,01), e foi possível encontrar modelos de regressão simples que têm uma explicação moderada na maturação, apenas utilizando variáveis de medição simples, tal como a altura, o peso e o perímetro do braço. Estes resultados devem levar as entidades competentes a refletir acerca do modo de emparelhamento dos atletas nas competições de uma forma justa em termos de maturação.
- Effect of Slow Abdominal Breathing Technique on Heart Rate Variability in Male SmokersPublication . Catela, David; Seabra, Ana Paula; Mercê, Cristiana; Branco, Marco A. C.Cigarette smoking is one of the highest contributors to the risk of cardiovascular diseases. The aim of the study was to verify the effect of a breathing technique on cardiac autonomic function in long-term male smoker subjects, by short-term heart rate variability analysis. The effect of a breathing technique on heart rate variability, in five long-term male smokers was analyzed. For almost all participants in this study, paced and predominantly abdominal breathing was beneficial, because it afforded greater asymmetry in short-term heart rate variability, as expressed by Poincaré plots, reinforced by significantly higher shortterm variability, long-term variability, root mean square of successive differences, differences of successive intervals greater than 50ms, and Approximate Entropy. An easily learned breathing technique, which is inexpensive and non-intrusive, can help smokers to momentarily remedy the nefarious cardiac effects of their smoking habit.
- The influence of sport practices on body composition, maturation and maximum oxygen uptake in children and youthPublication . Mercê, Cristiana; Branco, Marco A. C.; Rodrigues Ferreira, Mário André; VencesBrito, Antonio; Catela, David; Seabra, Ana Paula; Milheiro, Vítor; Cynarski, WojciechSystematic sport practice at younger ages positively influences body composition and maximum oxygen uptake (VO2max). On the other hand, its influence on maturation is still not consensual, and some studies claim a negative effect. Few studies have approached the differences in this influence according to different sport practices. The present study aims to analyse and compare the influence of karate and swimming practices, and the non-practice of sports, on body composition, VO2max and maturation in children and youth. Data were collected in 126 youth, 54 karate athletes, 36 swimming athletes and 36 participants with no sport practice (M=11.56±2.06 years). The type of sport practice had a different influence on body composition and VO2max, no negative influence was verified on maturation. In general, the sport practices revealed a positive influence in children and youth’s body composition. The karate practice provided significant lower body fat mass and higher lean mass in males. Swimming athletes revealed a significant higher VO2max compared to all other groups, while karate didn´t differed from no-practice group. The different influence of sport practices verified highlighted the importance of a multilateral development of children and youth by practising several sports.
- Comportamento motor: uma área de conhecimentoPublication . Catela, David; Seabra, Ana Paula; Branco, Marco A. C.; Mercê, Cristiana
- Metabolic and energetics characterization and gender comparison in prepubertal karate practitionersPublication . VencesBrito, António M.; Rodrigues-Ferreira, Mário A.; Milheiro, Vitor; Branco, Marco A. C.; Mercê, Cristiana; Seabra, Ana Paula; Catela, DavidThe number of children practicing karate is constantly increasing. It is necessary to provide correct information to the karate masters/coaches about this specific population, so they can properly develop karate training processes without causing any harm to practitioners but, on the contrary, contribute to the harmonious development of children and youths. This study was carried out with twenty-one prepubertal karate practitioners, male and female. They were analyzed on their maturational development, metabolic and energetic behavior in an incremental test until exhaustion. Only the energetic variables presented significant differences between gender, so it seems that the karate practice has a similar metabolic impact in the development of the prepubertal karate practitioners of both genders.
- Postural Control in Preschool Children with Developmental Coordination Disorder, in Sitting Position During a Functional TaskPublication . Mercê, Cristiana; Branco, Marco A. C.; Seabra, Ana Paula; Catela, DavidThe developmental coordination disorder is a motor disorder that affects 5 to 6% of children at school-age. The postural control deficit is one of the most prevalent problems affecting 73 to 87% of these children. The present research aims to analyze and compare postural control in probable (p-DCD) and at- risk of developmental coordination disorder children and in typical children in a sitting position during a functional task. p-DCD children were tendentially less recurrent, less periodic, simpler and more regular. These children oscillated more and faster in conditions with visual information; with a visual focus they had more stability and oscillated less and slowler campared to the baseline; without visual information they reduced their oscillations and velocity and become less recurrent, periodic, stable and simpler, possibly freenzing more degrees of freedom in order to respond to absence of external information. p-DCD seem to be more dependent on external stimulus like visual information to auto organize their own balance. The greater the task’s complexity, the lesser and slower their oscillations were but also more recurrent and periodic. Despite oscillating, more and faster in all conditions and being tendentially more recurrent and periodic, in risk children revealed a behaviour pattern similar to typical in both variables. p-DCD, at-risk and typical children reveal the same manner of action without visual information, less and slower oscillations. Most likely, the problem with p-DCD is not in motor control, but on perception-action cycles’ effectivness; and, where stimulation must be focused.
- Postural Control in Developmental Coordination Disorder and Typical Children: A Systematic ReviewPublication . Mercê, Cristiana; Branco, Marco A. C.; Seabra, Ana Paula; Catela, DavidDevelopmental Coordination Disorder (DCD) is a motor disorder without neural compromising that affects 6% of school-age children. One of the most prevalent problems is Postural Control (PC) deficit, which affects 73% to 87% of this population . A systematic review was conducted between 24 February 2016 and 3 March 2016 in order to identify the methodologies formerly used in the PC study on DCD children, and the differences determined between them and typical children with the purpose of identifying clues for a suitable intervention. Article references were searched further for additional relevant publications using the electronic databases: PubMed, Science Direct, Scopus, Web of Science, Cochrane and Scielo. The search was performed in English, French, Portuguese and Spanish. 9 articles were retrieved for analysis, being that no articles mentioning nonlinear methods were found. Previous studies suggest that DCD children are more dependent on visual information (VI). In standing condition DCD children revealed to be more variable and oscillate more than typical, especially with increasing difficulty, e.g. without VI or doing tasks simultaneously. In walking balance with no VI, DCD children significantly decreased their step frequency and step length, walking slower. For a more suitable intervention with DCD children we should: consider attentional factors; work on the perception-action link; work on the timing of gastrocnemius contraction and improve this peak force; moreover, increase the limit of stability in backward excursion.
- Metabolic and energetics characterization and gender comparison in prepubertal karate practitionersPublication . VencesBrito, António M.; Rodrigues Ferreira, Mário André; Milheiro, Vitor; Branco, Marco A. C.; Mercê, Cristiana; Seabra, Ana Paula; Catela, DavidThe number of children practicing karate is constantly increasing. It is necessary to provide correct information to the karate masters/coaches about this specific population, so they can properly develop karate training processes without causing any harm to practitioners but, on the contrary, contribute to the harmonious development of children and youths. This study was carried out with twenty-one prepubertal karate practitioners, male and female. They were analyzed on their maturational development, metabolic and energetic behavior in an incremental test until exhaustion. Only the energetic variables presented significant differences between gender, so it seems that the karate practice has a similar metabolic impact in the development of the prepubertal karate practitioners of both genders
- Exploratory study on maturation and competition level in young karate practitionersPublication . Branco, Marco A. C.; VencesBrito, António M.; Seabra, Ana Paula; Mercê, Cristiana; Rodrigues Ferreira, Mário André; Milheiro, Vítor; Catela, DavidParing children improve the chance for success and reduce injury in sport. Despite the maturity differences between children, chronological age remains the main criterion to equalize competition levels, but with limited efficiency. However, in Karate, weight is also considered. We went to investigate the association between chronological age and maturational indicators and find simple models to put on reflection new ways to assess the maturity. Data were collected in 54 young Karate practitioners (age: 12.67 ± 2.49 years, experience: 4.99 ± 2.44 years, height: 150.45 ± 15.25 cm, weight: 43.09 ± 14, 17 kg, 20 girls). Age correlated significantly with self-observation of sexual maturation (rho = 0.838; p < 0.01), and it was possible to find simple regression models that have a moderate explanation in maturation, using only simple measurable variables such as the height, weight and arm circumference. These results should lead the competent entities to reflect on the way of pairing of the athletes in the competitions, in a fair way in terms of maturation.