Vila-Chã, Carolina; Falla, Deborah; Farina, Dario
AIM: The purpose of this study was to investigate the effects of eccentric exercise of the knee extensors on force steadiness and neural drive to the vasti muscles during submaximal isometric contractions.
METHODS: Ten healthy subjects (age, mean ± SD, 24.9 ± 3.2 yrs) participated in the study. The subjects performed maximum voluntary contractions (MVC) of the knee extensors followed by isometric contractions at 2.5, 5, 10, 15, 20 and 30% MVC at baseline, immediately after and 24h after eccentric exercise of the quadriceps. During each contraction, force and surface EMG of the vastus medialis (VM), vastus lateralis (VL), biceps femoris...
Magalhães, Pedro M.; Costa, M.J.; Lopes, Vítor P.; Duarte, José Alberto
There are some evidences that exercise training reduces total and
abdominal fat and some systemic variables with improve health benefits.
The sim of this study was to ana1yse the variation of some morphologic
and systemic variables in 16 (age-64.5±7.2) obese and overweight
(BM!=31.4o±5.7) type 2 diabetic patieots, of hoth gender, dutiog a
regular physical exercisc program, which consists of 3 5 minutes of fast
walking every days of the week, during 8 months, and no diet
Lopes, Vítor P.; Magalhães, Pedro M.; Bragada, José A.
The purpose was to derive a regression equation that estimatcs energy
expenditure from accelerometer counts in oId obese adult. The sample
comprised 14 oId obese or overweight adults (63±7 years).
Maia, José A.R.; Lopes, Vítor P.; Martins, Sónia; Amorim, António; Alves, Cintia
The study of physical activity patterns (PAP) is still in its infancy due to
methodological problems in measuring instruments of physical activity, and the
lack of specific analytical tools to capture all its intrinsic issues. Moreover, it is not
well known if differences among subjects are mainly due to specific environmental
conditions, genetic attributes or both. This picture is more acute in children.
PURPOSE: to explore different ways of viewing and analyzing PAP in children.
METHODS: 31 twin pairs (18 MZ and 13 DZ) aged 6 to 12 years of age were
monitored for 5 days (3 week-day and a week-end) with a tri-axial accelerometer
(TRITRAC R3D). Count...
Lopes, Vítor P.; Vasques, Catarina; Maia, José A.R.
Silva, A.J.; Marques, M.C.; Garrido, N.; Barbosa, Tiago M.; Costa, M.J.; Louro, H.; Reis, V.M.; Marinho, D.A.
Swimming performance is affected by several factors including the
hydrodynamic drag. Hydrodynamic drag is the force that a swimmer has
to overcome in order to maintain his movement through water and is
highly dependent on swimming technique.
PURPOSE: To analyse in young swimmers the relationship between
hydrodynamic drag and the front crawl performance.
METHODS: 25 young swimmers (11 females and 14 males) participated
in this study. Their mean (standard deviation) age, body mass, height
and best swimming performance in 100 m front crawl was 12.08 (0.76)
years, 43.08 (7.60) kg, 1.52 (0.08) m and, 75.11 (9.57) s, respectively
Barbosa, Tiago M.; Costa, M.J.; Marques, M.C.; Moreira, M.; Silva, A.J.; Marinho, D.A.
The role of drag force in competitive swimming is one of the
main topics for researchers and field practitioners as it allows
enhancing performance. The development of “flow chart” models
confirming the relationships between drag force and other
determinant variables was never attempted in competitive
swimming. Moreover, main research groups dedicate little
attention to age-group swimming. PURPOSE: The aim was to
develop a structural equation modeling (i.e., path-flow analysis
model) for active drag force (Da) based on anthropometric,
hydrodynamic and biomechanical determinants in young
swimmers. The theoretical model was developed according to
main review papers about these determinants. METHODS:
Sixteen male swimmers (12.50±0.51 years-old; Tanner stages’ 1
-2) were evaluated. It was assessed:...
Marinho, D.A.; Ribeiro, J.; Mantripragada, N.; Machado, L.; Vilas-Boas, J.P.; Fernandes, R.J.; Barbosa, Tiago M.; Rouboa, A.; Silva, A.J.
The gliding phase following a swimming start or turn is an
important component of the overall swimming performance.
PURPOSE: To analyse the effect of depth on hydrodynamic drag
force during the underwater gliding, using computational fluid
METHODS: A three-dimensional domain was created to simulate the fluid flow around a swimmer model, representing the
geometry of part of a lane in a swimming pool. The water depth
of this domain was 1.50 m with a 3.0 m width and 11.0 m length.
Computational fluid dynamics methodology was used to perform
numerical simulations in the created domain which was divided
into a number of mesh cells. The k-epsilon turbulent model was
Maia, José A.R.; Coelho, Renata; Silva, R.; Seabra, André; Lopes, Vítor P.
Lopes, Luís; Santos, Rute; Pereira, Beatriz; Lopes, Vítor P.
Introduction: Children’s motor coordination may affect their activity
pattern and thereby influence their body-fatness. The aim of this
study was to analyze the relation between motor coordination and
waist circumference (WC) levels, in a Portuguese sample of school
children aged 8–12 years old.
Methods: The sample comprised 402 urban school children (girls-
46.8%), aged 8 to 12 years old (mean 9.6 = ± 0.6 years) from North
of Portugal. WC was measured with standardize protocols. Age- and
sex-adjusted Z-scores were also computed for WC. Motor coordination
levels were assessed with the Ko¨ rperkoordination Test fu¨ r Kinder
(KTK) and children were classified according to age-and sex
KTK criteria .
Results: In motor...
Queijo, Luís; Rocha, João; Barreira, Luísa; Barbosa, Tiago M.; Pereira, Paulo Miguel; San Juan, Manuel
The use of rapid prototyping has increasingly begun to reveal itself as a tool of great value in supporting medical activity. From two-dimensional medical images from computed tomography (CT) or magnetic resonance imaging (MRI) it is possible to obtain three-dimensional models. The models produced by rapid prototyping technologies are useful both in educational and medical-surgical environments. It can simplify the diagnosis of certain diseases, the development of complex surgical procedures, the prostheses and medical devices manufacture and the visualization of anatomical structures in educational environment.