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Physical demand assessment of volunteer firefighters during wildland firefighting
Teixeira, Tatiana; Pratas, Pedro; Santos, Joana; Monteiro, Pedro R.; Baptista, João Santos; Vaz, Mário A. P.; Guedes, Joana C.Wildland firefighting is physically and mentally demanding. The aerobic capacity of firefighters is important due to the demands of the activity and the associated occupational risks. The main objectives of this study were to identify and characterise the physically demanding tasks undertaken by volunteer firefighters during wildland fires (real work conditions). A total of 125 firefighters replied to a survey ...
Interlimb coordination during double support phase of gait in people with and w...
Couto, Ana G. B.; Vaz, Mário A. P.; Pinho, Liliana; Félix, José; Moreira, Juliana; Pinho, Francisco; Mesquita, Inês; Mesquita Montes, AntónioThis study aims to identify differences between participants with and without stroke regarding the ipsilesional and contralesional lower limbs kinematics, kinetics, muscle activity and their variability during double support phase of gait. Eleven post-stroke and thirteen healthy participants performed 10 gait trials at a self-selected speed while being monitored by an optoelectronic motion capture system, two f...
Repeatability and temporal consistency of lower limb biomechanical variables ex...
Couto, Ana G. B.; Vaz, Mário A. P.; Pinho, Liliana; Félix, José; Moreira, Juliana; Pinho, Francisco; Mesquita, Inês AlbuquerqueReliable biomechanical methods to assess interlimb coordination during the double-support phase in post-stroke subjects are needed for assessing movement dysfunction and related variability. The data obtained could provide a significant contribution for designing rehabilitation programs and for their monitorisation. The present study aimed to determine the minimum number of gait cycles needed to obtain adequate...
Methodological considerations in assessing interlimb coordination on poststroke...
Couto, Ana G. B.; Vaz, Mário A. P.; Pinho, Liliana; Félix, José; Silva, Sandra; Silva, Augusta; Sousa, Andreia S. P.To identify and summarize biomechanical assessment approaches in interlimb coordination on poststroke gait. Interlimb coordination involves complex neurophysiological mechanisms that can be expressed through the biomechanical output. The deepening of this concept would have a significant contribution in gait rehabilitation in patients with an asymmetric neurological impairment as poststroke adults. Poststroke a...
Modelling and Predicting Backstroke Start Performance Using Non-Linear And Line...
Jesus, Karla de; Ayala, Helon V. H; Jesus, Kelly de; Coelho, Leandro dos S; Medeiros, Alexandre I.A.; Abraldes, José Arturo; Vaz, Mário A. P.Our aim was to compare non-linear and linear mathematical model responses for backstroke start performance prediction. Ten swimmers randomly completed eight 15 m backstroke starts with feet over the wedge, four with hands on the highest horizontal and four on the vertical handgrip. Swimmers were videotaped using a dual media camera setup, with the starts being performed over an instrumented block with four forc...
Numerical study of hydrodynamic resistance on a sportive sprint hull
Barros, Francisco; Viriato, Nuno; Veiga Rodrigues, Carlos; Ferrás, Luís Jorge Lima; Vaz, Mário A. P.; Afonso, Alexandre M.In this work we perform a numerical study on the flow around the hulls of competition kayaks with the aim of predicting accurate drag forces. The numerical simulations were first performed using the Wigley hull geometry, a typical validation case for flows around marine vessels. The total drag force and wave profiles of the hull were determined for different Froude numbers and compared with experimental measure...
Effective swimmer’s action during the grab start technique
Mourão, Luis; Jesus, Karla de; Roesler, Hélio; Machado, Leandro J.; Fernandes, Ricardo J.; Vilas-Boas, João Paulo; Vaz, Mário A. P.The external forces applied in swimming starts have been often studied, but using direct analysis and simple interpretation data processes. This study aimed to develop a tool for vertical and horizontal force assessment based on the swimmers' propulsive and structural forces (passive forces due to dead weight) applied during the block phase. Four methodological pathways were followed: the experimented fall of a...
Use of interferometric techniques for measuring the displacement field in the p...
Monteiro, Jaime M.; Vaz, Mário A. P.; Melo, Francisco Q.; Gomes, J. F. SilvaAn experimental procedure based on holographic interferometry coupled with computer-aided image processing techniques was used to estimate the stress intensity factor (SIF) of a part-through crack in a plate. The loading consisted of a uniform remote tensile stress, leading to an opening and edge rotation displacement field along the crack plane. The evaluation of the crack opening displacements and edge rotati...