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Biblioteca Digital do IPB (53.442 recursos)

A Biblioteca Digital do IPB, tem por objectivo divulgar e permitir o livre acesso à produção científica produzida pela comunidade académica, promovendo a integração, partilha e a visibilidade da informação científica e garantindo a preservação da memória intelectual do Instituto Politécnico de Bragança.

DCDEF - Artigos em revistas

Mostrando recursos 1 - 20 de 69

  1. Muscle tissue changes with aging

    Pereira, Ana de Fátima; Silva, A.J.; Costa, A.M.; Monteiro, A.M.; Bastos, Estela; Marques, M.C.
    Sarcopenia is characterized by a progressive generalized decrease of skeletal muscle mass, strength and function with aging. Recent- ly, the genetic determination has been associated with muscle mass and muscle strength in elderly. These two phenotypes of risk are the most commonly recognized and studied for sarcopenia, with heritability ranging from 30 to 85% for muscle strength and 45-90% for muscle mass. It is well known that the development and maintenance of muscle mass in early adulthood reduces the risk of developing sarcopenia and leads to a healthy aging. For that reason it seems important to identify which genetic factors interact...

  2. The influence of ACE ID and ACTN3 R577X polymorphisms on lower-extremity function in older women in response to high-speed power training

    Pereira, Ana; Costa, A.M.; Monteiro, A.M.; Izquierdo, Mikel; Silva, A.J.; Bastos, Estela; Marques, M.C.
    Background We studied the influence of the ACE I/D and ACTN3 R577X polymorphisms (single or combined) on lower-extremity function in older women in response to high-speed power training. Methods One hundred and thirty-nine healthy older Caucasian women participated in this study (age: 65.5 ± 8.2 years, body mass: 67.0 ± 10.0 kg and height: 1.57 ± 0.06 m). Walking speed (S10) performance and functional capacity assessed by the “get-up and go” (GUG) mobility test were measured at baseline (T1) and after a consecutive 12-week period of high-speed power training (40-75% of one repetition maximum in arm and leg extensor exercises; 3 sets 4–12 reps, and two power exercises...

  3. Maternal perceptions of children's weight status

    Lopes, Luís; Santos, Rute; Pereira, Beatriz; Lopes, Vítor P.
    Several studies have addressed mothers’ perceptions of their children’s weight status; however, there is no investigation on Portuguese children (a country with one of the highest levels of children’s overweight and obesity in Europe). The aim of this study was to quantify maternal misclassification of child weight status in a sample of Portuguese children aged 9 to 12 years, according to gender, family income, and maternal weight status, education level and age. Methods Data were collected in a school-based study (school year 2009/2010) in northern Portugal with 499 urban children (236 girls; 47.3%). Body mass index was calculated from measurements of...

  4. Longitudinal study in male swimmers: a hierachical modeling of energetics and biomechanical contributions for performance

    Costa, Mário; Bragada, José A.; Marinho, D.A.; Lopes, Vítor P.; Silva, A.J.; Barbosa, Tiago M.
    The aim of this study was to assess the pooled and individual response of male swimmers over two consecutive years of training and identify the energetic and biomechanical factors that most contributed for the final performance. Nine competitive swimmers (20.0 +/- 3.54 years old; 10.1 +/- 3.41 years of training experience; 1.79 +/- 0.07 m of height; 71.34 +/- 8.78 kg of body mass; 22.35 +/- 2.02 kg.m(-2) of body mass index; 1.86 +/- 0.07 m of arm span; 116.22 +/- 4.99 s of personal record in the 200 m long course freestyle event) performed an incremental test in six...

  5. Physical activity in adolescents: examining Influence of the best friend dyad

    Lopes, Vítor P.; Gabbard, Carl; Rodrigues, Luis Paulo
    Purpose: The aim of this study was to determine the influence of dyadic friendship relationships on adolescent physical activity (PA) behavior. Unique to this study was examination of the “best friend” dyad. Methods: Participants were 268 adolescents (13 e 18 years of age) of both sexes (boys n ¼ 140, girls n ¼ 128), constituting 134 best friendship dyads; 84 were reciprocal best friends and 50 were not. PA was evaluated with the short version of the International Physical Activity Questionnaire. The Actor-Partner Interdependence Model was tested using a hierarchical linear model. First, a null model was run to calculate intraclass correlation coefficient for...

  6. Involvement of advanced glycation end products in the pathogenesis of diabetic complications: the protective role of regular physical activity

    Magalhães, Pedro M.; Appell, H.J.; Duarte, José Alberto
    Advanced glycation end products (AGEs) may play an important role in the pathogenesis of chronic diabetic complications and in the natural process of biological aging. In fact, maintained hyperglycaemia favours the formation of AGEs at the tissue level in diabetic patients, which may influence the triggering of different chronic pathologies of diabetes such as retinopathy, nephropathy, neuropathy and macro- and micro-vascular diseases. Moreover, the literature has also demonstrated the involvement of AGEs in biological aging, which may explain the accelerated process of aging in diabetic patients. The practice of regular physical activity appears to positively influence glycaemic control, particularly in...

  7. Physical fitness predicts adiposity longitudinal changes over childhood and adolescence

    Rodrigues, Luis Paulo; Leitão, Raquel; Lopes, Vítor P.
    Objectives: The purpose of this study was to examine the influence of physical fitness (PF) on the development of subcutaneous adipose tissue in children followed longitudinally over a 9 year period ranging from childhood to adolescence. Design: This longitudinal study followed 518 healthy participants (262 boys, 256 girls) over a 9-year period ranging from childhood (age 6) to adolescence (age 15). Adiposity (triceps and subscapular skinfolds), and fitness (60 s sit-ups, flexed arm hang, standing long jump, 50mdash, 10mshuttle run, sit-and-reach, and 20mpacer run) were assessed at four annual time points during primary school, and on a follow up, 6 years later, during secondary school. Methods: Growth in...

  8. Associations between gross Motor Coordination and Academic Achievement in elementary school children

    Lopes, Luís; Santos, Rute; Pereira, Beatriz; Lopes, Vítor P.
    We aimed to evaluate the relationship between gross motor coordination (MC) and academic achievement (AA) in a sample of Portuguese children aged 9–12 years. The study took place during the 2009/2010 school year and involved 596 urban children (281 girls) from the north of Portugal. AA was assessed using the Portuguese Language and Mathematics National Exams. Gross MC was evaluated with the Körperkoordination Test für Kinder. Cardiorespiratory fitness was predicted by a maximal multistage 20-m shuttle-run test of the Fitnessgram Test Battery. Body weight and height were measured following standard procedures. Socio-economic status was based on annual family income. Logistic...

  9. Prevalence of overweight/obesity and its association with sedentary behavior in children

    Vasques, Catarina; Mota, Maria Paula; Correia, Teresa; Lopes, Vítor P.
    Abstract Objective: The aim of this study was to determine the prevalence of overweight and obesity in children in the northeast region of Portugal, and to examine its association with sedentary behavior. Methods: Data were collected on 1786 children (907 boys, 879 girls) aged 6 to 13 years. Body mass index was calculated from measured height and weight (weight in kg/height in m squared). Overweight and obesity were determined using the International Obesity Task Force cutoff values. Sedentary behavior was assessed based on means of transport to and from school and time spent watching TV and playing video games (TVPC). Results: The prevalences of overweight and obesity were 22.6%...

  10. Associations between sedentary behavior and motor coordination in children

    Lopes, Luís; Santos, Rute; Pereira, Beatriz; Lopes, Vítor P.
    Objectives: This study was conducted to evaluate the relationship between objectively measured sedentary behavior (SB) and motor coordination (MC) in Portuguese children, accounting for physical activity (PA), accelerometer wear time, waist-to-height ratio, and mother’s education level. Methods: A cross-sectional school-based study was conducted on 213 children (110 girls and 103 boys) aged 9–10 in the north of Portugal during the spring of 2010. Accelerometers were used to obtain detailed objective information about daily PA and SB over five consecutive days. MC was measured with a body coordination test (Korperkoordination Test für Kinder). Waist and height were measured by standardized protocols and the waist-to-height ratio...

  11. The interaction between intra-cyclic variation of the velocity and mean swimming velocity in young competitive swimmers

    Barbosa, Tiago M.; Morouço, P.; Jesus, S.; Feitosa, W.G.; Costa, M.J.; Marinho, D.A.; Silva, A.J.; Garrido, D.N.
    The aim of this study was to assess the relationship between the intra-cyclic variation of the horizontal velocity (dv) and the velocity of the 4 competitive swimming techniques in young swimmers. 45 young swimmers performed a set of maximal 4 × 25 m (freestyle, backstroke, breaststroke and butterfl y stroke) swims with in water start. A speed-meter cable was attached to the swimmer’s hip. The dv and the swimming velocity were analyzed. Within-subject tests presented signifi cant variations in the dv based on the swimming technique. Post-hoc test revealed signifi cant diff erences across all pairwised swimming techniques (P < 0.001), except for the comparison between freestyle and backstroke (P = 0.98). The dv was...

  12. Estimating the trunk transverse surface area to assess swimmer's drag force based on their competitive level

    Barbosa, Tiago M.; Morais, J.E.; Costa, M.J.; Mejias, J.E.; Marinho, D.A.; Silva, A.J.
    The aim of this study was to compute and validate trunk transverse surface area (TTSA) estimation equations to be used assessing the swimmer’s drag force according to competitive level by gender. One group of 130 swimmers (54 females and 76 males) was used to compute the TTSA estimation equations and another group of 132 swimmers (56 females and 76 males) were used for its validations. Swimmers were photographed in the transverse plane from above, on land, in the upright and hydrodynamic position. The TTSA was measured from the swimmer’s photo with specific software. It was also measured the height, body mass, biacromial diameter, chest sagital diameter...

  13. High level swimming performance and its relationship to non-specific parameters: a cross-sectional study on maximum handgrip isometric strength

    Garrido, N.; Silva, A.J.; Fernandes, R.J.; Barbosa, Tiago M.; Costa, A.M.; Marinho, D.A.; Marques, M.C.
    Online first

  14. The role of physical activity and diet on overall and central obesity incidence

    Camões, Miguel; Oliveira, Andreia; Lopes, Carla
    Evaluate the role of different types of physical activity (PA) and diet on overall and central obesity incidence. Methods: A cohort study with 1,621 adults was conducted in an urban Portuguese population. Anthropometrics were objectively obtained among 1999-2003 and 2005-2008. Overall obesity was defined by a BMI≥30.0 kg/m2 and central obesity by a WC>88.0cm in women and >102.0cm in men. Usual PA and dietary intake were assessed using validated questionnaires. Analyses of obesity incidence were conducted through different types of PA and a “healthy” dietary score. Results: Significant inverse associations were found between leisure-time PA and obesity incidence, namely among...

  15. Analysis of the determinant kinematical parameters for performance in the 200-m freestyle swimming event

    Ferreira, Maria Inês; Silva, A.J.; Oliveira, Diogo Roberto de; Garrido, N.; Barbosa, Tiago M.; Marinho, D.A.; Reis, V.M.
    Os objetivos deste estudo foram: i) caracterizar o nado submáximo e máximo do ponto de vista cinemático; ii) verificar a influência das variáveis cinemáticas na prova máxima de 200 metros crawl. Nove nadadores de elite nacionais realizaram dois testes: um submáximo, descontínuo de intensidade progressiva; outro máximo, que consistiu em uma simulação de uma prova de 200 m crawl. Foram estudados os parâmetros cinemáticos gerais da mecânica da braçada, a duração de cada fase do ciclo gestual, a velocidade do centro de massa e a variação intracíclica da velocidade horizontal. Verificaram-se diferenças cinemáticas significativas da frequência gestual, velocidade de deslocamento...

  16. Longitudinal interventions in elite swimming: a systematic review based on energetics, biomechanics and performance

    Costa, M.J.; Bragada, José A.; Marinho, D.A.; Silva, A.J.; Barbosa, Tiago M.
    Longitudinal information requires the notion of repeated measurements throughout time. Such data is important because it allows the determination of the effectiveness of an intervention program. Research in competitive swimming has given special emphasis to energetics and biomechanics as determinant domains to improve performance. The purpose of this systematic review was to summarize longitudinal evidences on the energetic, biomechanical, and performance status of elite swimmers. A computerized search was made in 6 databases, conference proceedings, and department files. The 28 studies that satisfied the inclusion criteria were selected for analysis. Studies' qualitative evaluation was made by 2 independent reviewers using...

  17. Deep and shallow water effects on developing preschoolers’ aquatic skills

    Costa, A.M.; Marinho, D.A.; Rocha, H.; Silva, A.J.; Barbosa, Tiago M.; Ferreira, S.S.; Martins, Marta
    The aim of the study was to assess deep and shallow water teaching methods in swimming lessons for preschool children and identify variations in the basic aquatic skills acquired. The study sample included 32 swimming instructors (16 from deep water programs and 16 from shallow water programs) and 98 preschool children (50 from deep water swimming pool and 48 from shallow water swimming pool). The children were also studied regarding their previous experience in swimming (6, 12 and 18 months or practice). Chi-Square test and Fisher's exact test were used to compare the teaching methodology. A discriminant analysis was conducted...

  18. How informative are the vertical buoyancy and the prone gliding tests to assess young swimmers hydrostatic and hydrodynamic profiles?

    Barbosa, Tiago M.; Costa, M.J.; Morais, J.E.; Moreira, M.; Silva, A.J.; Marinho, D.A.
    The aim of this research was to develop a path-flow analysis model to highlight the relationships between buoyancy and prone gliding tests and some selected anthropometrical and biomechanical variables. Thirty-eight young male swimmers (12.97 ± 1.05 years old) with several competitive levels were evaluated. It were assessed the body mass, height, fat mass, body surface area, vertical buoyancy, prone gliding after wall push-off, stroke length, stroke frequency and velocity after a maximal 25 [m] swim. The confirmatory model included the body mass, height, fat mass, prone gliding test, stroke length, stroke frequency and velocity. All theoretical paths were verified except for the vertical buoyancy test that...

  19. Health-related physical fitness is associated with selected sociodemographic and behavioral factors in brazilian school children

    Guedes, Dartagnam Pinto; Neto, J.M.; Lopes, Vítor P.; Silva, A.J.
    This study investigated the association between sociodemographic and behavioral factors and health standards based on physical fitness component scores in a sample of Brazilian schoolchildren. Methods: A sample of 1457 girls and 1392 boys aged 6 to 18 years performed a test battery of 5 items: 1) sit-and-reach, 2) curl-up, 3) trunk-lift, 4) push-up, and 5) progressive endurance run (PACER). The cut-off scores for gender and age suggested by the FitnessGram were adopted. Results: The findings showed that the sociodemographic and behavioral factors significantly associated with the ability of schoolchildren of meeting the health standards varied according to the fitness test. In the 5 tests used...

  20. Motor coordination, physical activity and fitness as predictors of longitudinal change in adiposity during childhood

    Lopes, Vítor P.; Maia, José A.R.; Rodrigues, Luis Paulo; Malina, Robert M.
    The purpose of this study was to examine the influence of motor coordination (MC), physical fitness (PF) and physical activity (PA) on the development of subcutaneous adiposity in a sample of children followed longitudinally from 6 to 10 years of age. Participants were 142 girls and 143 boys. Height, weight, and the triceps and subscapular skinfolds were measured annually between the ages of 6 and 10 years. PA was estimated with the Godin–Shephard questionnaire. MC was evaluated with the Körperkoordination Test für Kinder (KTK) test battery, and PF was assessed with four Fitnessgram tests: curl-ups (CU), push-ups (PU), trunk-lifts (TL)...

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