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Search Results: 1 - 10 of 89821 matches for " José António Ribeiro Maia "
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A modela o do desenvolvimento a partir da análise de trajetórias latentes. Um estudo aplicado às aptid es motoras
José Antnio Ribeiro Maia
Movimento , 2000,
Abstract: This paper aims at the discussion of the idea of the development of motor abilities, specially the need for its quantitative analysis with new methodologies. An emphasis is made upon different developmental trajectories of children and youth. Limited conceptual and analytical approaches used by sport scientists are critically reviewed and a new analytical strategy is presented to study intra-indi- vidual change within interindividual differences in their development pathways. This new methodology - latent trajectory analysis - is briefly presented and applied to an empirical problem, showing its richness to study normative and differential developmental problems related to motor abilities and motor skills in children and youth. This methodology tries to analyse, simultaneously, the views of normative and differential developmentalists since it deals with the individual subject and the group, the mean changes over time and the differences among subjects. It allows, also, the inclusion of predictors of change that govern the individual developmental trajectories.
Aspectos genéticos da actividade física. Estado actual do conhecimento baseado nos modelos animal e humano com amostras gemelares
Maria Madalena Castro Oliveira,José Antnio Ribeiro Maia
Movimento , 2002,
Abstract: Physical activity is a behaviour associatedto quality oflife andlongevity. This phenotype presents variation at the population levei whose main determinants studiedare, essentially, socio-economic, demographic and psychological. Yet, expkined variance of thes determinants is very low(<30%). A mainpart of the total variance of this phenotype has to be associated with another fundamental agent -the phenotype. The work we are presenting wants to review, in an exhaustive way, animal and human research with the twin methodology. Main research has dealt with three different expressions ofthe phenotype physical activity - total physical activity, sports participation andenergy expenditure. From the results emerges clearly the importance of genetic feature in the interindividual variation of physical activity at the population levei, whosemain effect centres around 50 -70%.
Physical activity in children and youngsters
Vitor Pires Lopes,José Antnio Ribeiro Maia
Revista Brasileira de Cineantropometria e Desempenho Humano , 2004,
Abstract: Physical activity (PA) is a preventive factor for diseases associated with inactivity. Childhood and adolescence are golden ages to promote PA habits for life. The purpose of this review study is to characterize PA levels of children and adolescents. We analyzed the studies of PA tracking and studies which attempted to identify the PA levels of children and youngsters. Longitudinal studies show that PA declines along age and that it has low stability. The decline of PA is steeper in the transition between childhood and adolescence and within adolescence. According to the analyzed studies children and adolescents do not accomplish the PA guidelines that were recommended for them. RESUMO A actividade física (AF) é um factor de preven o de uma série de doen as associadas à inactividade física. A infancia e a juventude s o consideradas idades fundamentais para a promo o de hábitos de AF que perdurem para toda a vida. Este estudo de revis o tem como objectivo caracterizar os níveis de AF das crian as e jovens. Faz-se uma análise aos estudos do tracking da AF e a pesquisas que procuraram identificar os níveis de AF de crian as e adolescentes. Os estudos longitudinais mostram que a AF é um comportamento com pouca estabilidade, verificando-se, para além disso, a existência de um declínio dos níveis de AF ao longo da idade, mais acentuado na transi o da entre a infancia e a adolescência e durante a adolescência. Os dados disponíveis parecem confirmar a no o de que as crian as e jovens n o cumprem, em termos de quantidade e intensidade de actividade física, as recomenda es emanadas para estes grupos etários.
Morphological classification of novice female volleyball players
Simonete Pereira da Silva,José António Ribeiro Maia
Revista Brasileira de Cineantropometria e Desempenho Humano , 2003,
Abstract: The characteristics of physique have been the subject of several studies in sport sciences because high-level competitive sports place maximum demands on the physical constitution of players. Furthermore, the specifi c function performed by a player in a game may be related to a particular modality. The goals of this study were: (1) to describe and to compare, from a somatic point of view, the physiques of 71 female volleyball players at beginner levels A and B (aged 12-14 years); and (2) to identify the components of somatic structure that best differentiate the athletics by level of experience. In order to evaluate the players’ somatic structure,we performed 21 measurements including: weight and height, diameters, circumferences, upper and lower limb measurements and skinfolds thicknesses. Discriminant function analysis (DFA) was used to identify the power of variables classifi cation. No difference was found in physique between level A and level B players. They were classifi ed by somatotype as mesomorphic endomorphs (A = 4.76 - 3.78 - 1.85; and B = 4.37 - 4.02 - 1.88). RESUMO As características morfológicas têm sido objeto de vários estudos em Ciências Desporto, pelo fato de o fen meno do desporto de alta competi o exigir o máximo da estrutura física dos atletas e pela expectativa da fun o que o atleta desempenha em jogo. O presente estudo teve como objetivo: (1) descrever e comparar, do ponto de vista somático, a estrutura morfológica de 71 atletas de voleibol do sexo feminino dos escal es de forma o A e B (entre os 12 e 14 anos de idade); (2) identifi car os componentes da estrutura somática que melhor diferenciam as atletas de níveis distintos. Para a avalia o da estrutura somática das atletas foram efetuadas 21 avalia es, incluindo além do peso e altura, comprimento dos membros, perímetros, diametros e pregas de adiposidade subcutaneas. Com o intuito de verifi car o poder discriminatório das variáveis na separa o dos grupos, foi utilizada a análise da fun o discriminante (AFD). Os resultados evidenciaram que n o houve diferen a quanto à estrutura morfológica entre as atletas dos níveis A e B. Quanto à classifi ca o somatotipológica, as atletas foram classifi cadas na categoria meso-endomórfi ca (A = 4.76 - 3.78 - 1.85; B = 4.37 - 4.02 - 1.88).
Semelhan?a fraterna nos níveis de aptid?o física: um estudo na popula??o rural de Calanga, Mo?ambique
Saranga, Silvio;Nhantumbo, Leonardo;Fermino, Rogério César;Prista, António;Seabra, André;Maia, José António Ribeiro;
Revista Brasileira de Educa??o Física e Esporte , 2010, DOI: 10.1590/S1807-55092010000300007
Abstract: this study has two aims: 1) to determine familial clustering in different physical fitness components and 2) to estimate its genetic component (h2). we sampled 330 subjects (174 males and 156 females) aged seven to 17 years, belonging to 132 families from calanga, a rural locality in mozambique. physical fitness was assessed with the following tests: sit-and-reach (sr), standing long jump (slj), flexed arm hang (fha), hand grip (hg), 1-mile run (1m), curl-ups (cu), and shuttle run 10 x 5 meters (shr). correlations were used to estimate sibling clustering, and genetic factors were computed using a variance components approach within a maximum likelihood framework. all computations were adjusted for height, weight, age, sex, age2, age3, sex*age, sex*age2 as well as a physical activity score. sage, a statistical package for genetic epidemiology, was used in all analysis.correlations within each fitness component were low: brother-brother (between -0.01 and 0.25), sister-sister (between -0.19 and 0.45) and brother-sister (between -0.02 and 0.39). the genetic component in each fitness component was: sr h2 = 0.41 ± 0.16, p = 0.01; alj h2 = 0.60 ± 0.14, p = 0.001; fha h2 = 0.18 ± 0.20, p = 0.37; cu h2 = 0.09 ± 0.13, p = 0.59; hg h2 = 0.19 ± 0.13, p = 0.16; shr h2 = 0.07 ± 0.15, p = 0.63; 1m h2 = 0.49 ± 0.14, p = 0.001. conclusions: 1) familial aggregation was higher between sisters than between brothers or siblings of opposite gender; 2) moderate genetic factors were found in flexibility, aerobic capacity and explosive strength; 3) variance between siblings in the other phenotypes were mostly explained by environmental factors that may be related to family subsistence activities.
Modeling stability in the somatotype of children and youngsters from 10 to 16 years of the Madeira growth study (Portugal)
José António Ribeiro Maia,Celso António Rosa de Almeida e Silva,Duarte Luís de Freitas,Gaston Beunen
Revista Brasileira de Cineantropometria e Desempenho Humano , 2004,
Abstract: This investigation aims at the study of somatotype′s (tri-dimensional structure) stability in children and youngsters from Madeira (Portugal). Based on a stratified and proportional sample and from a mixed-longitudinal study, we obtained information from 309 subjects (157 boys, 152 girls) that participed in ‘Madeira Growth Study’. Somatotype was estimated with the Heath-Carter method, and statistical analysis was based on quasi-simplex models to optimize the multivariate data structure. Mplus was used in all calculations. Results from fitting models to the multidimensional nature of the data have shown that somatotype is strongly stable over the age range of 10 to 16 years. This characteristic highlights its reduced capability to change, and thus inform us about its prediction. RESUMO Este estudo pretende investigar a estabilidade do somatótipo, enquanto entidade tridimensional, de crian as e jovens Madeirenses (Portugal). Com base numa amostra estratificada proporcional, e a partir de um delineamento longitudinal-misto, foi obtida informa o de 309 sujeitos dos dois sexos (157 rapazes e 152 mo as) que participaram no ‘Estudo de Crescimento da Madeira’. O somatótipo foi estimado com base no procedimento de Heath-Carter, e a análise estatística recorreu à modela o quasi-simplex para solucionar a estrutura multivariada dos dados. Os cálculos foram efectuados no software Mplus. Na sua essência, os resultados do ajustamento dos diferentes modelos à estrutura do somatótipo sugerem a sua forte estabilidade no intervalo etário dos 10 aos 16 anos. Esta característica salienta a sua reduzida altera o, e consequente previsibilidade desenvolvimentalista.
Fatores genéticos na agrega??o familiar da press?o arterial de famílias nucleares portuguesas
Fermino, Rogério César;Seabra, André;Garganta, Rui;Maia, José António Ribeiro;
Arquivos Brasileiros de Cardiologia , 2009, DOI: 10.1590/S0066-782X2009000300008
Abstract: background: despite of the increase in the prevalence of hypertension in portugal, the importance of genetic factors in blood pressure (bp) has not been studied extensively in our country. objectives: to verify the indirect presence of vertical transmission of genetic factors between parents and children in bp values, and to estimate the magnitude of genetic factors contributing for variation in bp values in the population. methods: sample size comprises 367 individuals (164 parents and 203 children) pertaining the 107 nuclear families participating in "familias activas" project, proceeding from different regions of north portugal. the bp was measured with omron? model m6 (hem-7001-e) digital device. spss 15.0 was used for data analysis; pedstats was used to verify the structure of each family data. familial correlations and heritability estimates were computed in fcor and assoc modules of s.a.g.e. version 5.3. results: for systolic bp (sbp), correlation values were low to moderate (0,21< r <0,35); for diastolic bp (dbp) values were found to be moderate (0,24< r <0,50). genetic factors explain 43 and 49% of the total variation in sbp and dbp, respectively. conclusion: a moderate amount of the sbp and the dbp is accounted for by genetic factors.
Estudos longitudinais sobre o crescimento somático e desempenho motor: delineamentos, desafios, necessidades
Silva, Simonete Pereira da;Beunen, Gaston;Freitas, Duarte Luiz de;Maia, José António Ribeiro;
Revista Brasileira de Cineantropometria & Desempenho Humano , 2013, DOI: 10.5007/1980-0037.2013v15n1p130
Abstract: the main objective of the present review of the literature was to provide an overview of the major longitudinal and mixed longitudinal studies focusing on somatic growth, biological maturation, and, more recently, physical performance. we selected studies conducted in the usa, europe, and portuguese speaking countries. first, the main theoretical considerations, general characteristics, study designs, statistical analyses, and methodological challenges of the data were presented. next, we provided an overview of the most important longitudinal and mixed longitudinal studies. finally, the major challenges of the ongoing studies were outlined.
Desempenho neuromotor, prematuridade e baixo peso à nascen?a
Lopes, Alfredo Alexandre Tomé;Tani, Go;Maia, José António Ribeiro;
Revista Brasileira de Cineantropometria & Desempenho Humano , 2011, DOI: 10.5007/1980-0037.2011v13n1p73
Abstract: there seems to be consensus that intrauterine influences during human development have long-term implications. the hypothesis has been raised that alterations in an individual's life cycle provoke lesions, some of them irreversible. the objectives of this study were: (1) to call attention to the problem of distance effects of neuromotor performance, prematurity and low birth weight in children and youngsters; (2) to present relevant aspects of the conceptual framework of fetal programming and its interpretive relevance for deficits in motor performance and coordination. a pubmed database search was performed using different key words and their possible combinations. cross-sectional, longitudinal and case-control studies evaluating motor performance and fetal programming were selected. motor deficit levels ranged from 4% to 51% in the european population and from 4% to 56% in the north american population. a study involving the australian population reported a motor coordination deficit of 9.5%. there is no absolute agreement regarding the extent, reversibility and significance of motor deficits in view of the wide variability in deficit levels. the mechanisms that will induce problems in the neuromotor development of children, youngsters and adults under adverse conditions of fetal development are unknown and cannot be compensated for by sensorimotor stimulation.
Genetic factors and variability in blood pressure. A brief literature review.
Rogério Fermino,André Seabra,Rui Garganta,José António Ribeiro Maia
Revista Brasileira de Cineantropometria e Desempenho Humano , 2009,
Abstract: The main purpose of this review was to gather relevant information regarding the importance of genetic factors for the variability of blood pressure levels. A search was performed in the Pubmed database, and the following studies were selected: (1) studies reporting familial aggregation with heritability estimates, (2) linkage studies reporting only significant results, and (3) association studies between blood pressure, candidate genes and their allelic variants using a case-control design. Heritability estimates for systolic and diastolic blood pressure ranged from 14 to 68% and from 6 to 62%, respectively. We found significant linkage results for systolic blood pressure on chromosomes 2, 5, 6, 15 and 17. Relevant candidate genes presented disparate results in terms of their association with arterial hypertension. Blood pressure is a polygenic phenotype whose variation is partially mediated by genetic factors. The candidate genes identified do not sufficiently explain arterial hypertension.
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