Browsing by Author "Oliveira, C."
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- Caracterização cinemática do movimento básico de hidroginástica "polichinelo" a diferentes ritmos de execuçãoPublication . Costa, M.J.; Oliveira, C.; Teixeira, Genoveva; Marinho, D.A.; Silva, A.J.; Barbosa, Tiago M.O estudo teve como objectivo analisar as relações entre a cadência musical e as características cinemáticas de um movimento básico de Hidroginástica. Cinco mulheres jovens com pelo menos um ano de experiência na condução de aulas de Hidroginástica foram filmadas no plano sagital por um par de câmaras, permitindo uma projecção dupla e simultânea de imagens (superfície e subaquática). As mesmas foram obtidas durante a execução do movimento básico “Polichinelo” ao longo de 5 patamares com intensidade crescente (120 b.min-1, 135 b.min-1, 150 b.min-1, 165 b.min-1, 180 b.min-1). Verificou-se uma diminuição do período de ciclo ao longo do protocolo incremental. A cadência musical apresentou uma relação significativa com o deslocamento vertical do centro de massa e da mão. O incremento da cadência induziu um aumento da velocidade lateral do pé. Desta forma, sujeitos experientes na execução do exercício básico de Hidroginástica “Polichinelo” parecem aumentar a velocidade de execução para assim manter o deslocamento dos segmentos inferiores (i.e., pés) com ênfase nos movimentos latero-mediais. No entanto, a mesma opção não se verifica relativamente ao centro de massa e para os segmentos superiores (i.e., mãos) com ênfase na componente vertical onde o deslocamento é diminuído com o intuito de manter a sincronização do movimento com a cadência musical
- Constrangimento mecânico provocado pela válvula aquatrainer® associada ao sistema de oximetria directa (K4 B2) na cinemática de crolPublication . Oliveira, C.; Reis, António; Silva, A.J.; Garrido, Nuno D.; Louro, Hugo; Marinho, D.A.; Guidetti, L.; Barbosa, Tiago M.O estudo teve como objectivo determinar o constrangimento cinemático provocado pela válvula de treino Aquatrainer® (Cosmed, Roma, Itália), integrada com o sistema portátil analisador de gases K4 b2 (Cosmed, Roma, Itália), durante um esforço máximo na técnica de Crol. O protocolo consistiu na realização de dois percursos à intensidade máxima de 100 m Crol, em piscina de 50 metros: um percurso com o sistema de oximetria acoplado e outro em nado livre (sem o sistema) e um intervalo mínimo de 48 horas por seis crolistas. Duas câmaras registaram respectivamente imagens aéreas e subaquáticas no plano sagital. Foi efectuada a análise cinemática (Ariel Performance Analysis System, Ariel Dynamics Inc., Califórnia, EUA) de um ciclo gestual completo, através de um leitor de vídeo a 50 Hz (Panasonic, AG 7355, Japão). A duração do teste foi significativamente superior no nado constrangido do que no nado livre (P = 0.04). Sem a válvula os nadadores cumpriram os 100 metros em 95.24 ± 2.18 % do seu recorde pessoal e com a válvula a 90.99 ± 2.86 %. As restantes variáveis não apresentaram diferenças significativas entre as duas condições de exercitação. Verificou-se uma tendência para a frequência gestual (-1.58 %), distância de ciclo (-3.62 %), a velocidade de nado (-5.75 %), a a flutuação da velocidade do centro de massa (-2.21 %) e o índice de nado (-9.27 %) serem inferiores com a utilização da válvula. Já a o período do ciclo foi superior no nado constrangido do que no nado livre (1.63 %).
- Head-out aquatic exercise “sailer’s jigs” kinematics at increasing musical cadencePublication . Teixeira, Genoveva; Oliveira, C.; Costa, M.J.; Marinho, D.A.; Silva, A.J.; Barbosa, Tiago M.The aim of this study was to analyze the relationships between “Sailor’s jigs” kinematics and increasing music cadence. Six young women, non-pregnant, with at least one year of experience conducting this type of head-out aquatic program, with no kind of skeletal muscle injury reported in the last six months were evaluated. The exercise was recorded on video, in the frontal plane, using a pair of cameras, enabling a double projection, from above and underwater body motions, at five increasing cadences (120 b.min-1, 135 b.min-1, 150 b.min-1, 165 b.min-1 and 180 b.min-1). Images were thereafter digitized in specific software (Ariel Performance Analysis Systems). The cycle period decreased through the incremental protocol. Cycle period decrease is done decreasing joint range of motion and increasing the limbs segmental velocity as well. Although these combined kinematical strategy, a deeper analysis reveals that subjects decrease the cycle period mainly decreasing the range of motion.
- Head-out aquatic exercise “sailor’s jigs” kinematics at increasing musical cadencePublication . Teixeira, Genoveva; Oliveira, C.; Costa, M.J.; Marinho, D.A.; Silva, A.J.; Barbosa, Tiago M.
- Kinematical characterisation of a basic head-out aquatic exercise during an incremental protocolPublication . Oliveira, C.; Teixeira, Genoveva; Costa, M.J.; Marinho, D.A.; Silva, A.J.; Barbosa, Tiago M.The aim of this study was to analyze the relationships between musical cadence and kinematical characteristics of a basic head-out aquatic exercise. Six young women with at least one year of experience conducting head-out aquatic classes were videotaped in the sagital plane with a pair of cameras providing a dual projection from both above and underwater performing 5 incremental bouts (120, 135, 150, 165 and 180 b.min-1) of the basic head-out aquatic exercise “rocking horse”. There was a decrease of the cycle period throughout the protocol. Relationships between horizontal or vertical displacements with music cadence were not significant. Increased cadence imposed increased segmental and centre of mass’ velocities. As a conclusion expert and fit subjects seem to increase segmental velocity with increasing musical cadence.
- Kinematical characterization of a basic head-out aquatic exercise during an incremental protocolPublication . Oliveira, C.; Teixeira, Genoveva; Costa, M.J.; Marinho, D.A.; Silva, A.J.; Barbosa, Tiago M.Massive research has been produced throughout the last decades in order to better understand the role of head-out aquatic exercises in populations’ health (Barbosa et al, 2009). Indeed, such studies aimed to characterize the physiological acute and/or chronic response of subjects performing head-out aquatic exercises.
- R&D on control of vibrations under covicocepad during 2007-2008Publication . Barros, Rui; Baratta, Alessandro; Corbi, Ottavia; Braz-César, Manuel; Corbi, Ileana; Bairrão, Rogério; Guerreiro, Luís; Oliveira, C.; Magonette, GeorgesThis paper provides information on the latest R&D within COVICOCEPAD project approved in the framework of Eurocores program. It addresses the use of TLD, base isolation devices, MR dampers and a hybrid technique using both devices together. Some results are provided associated with calibration of a MR damper at FEUP, as well as its inclusion in a small scale laboratory set-up with proper equations of motion of the controlled smart structure. An application of semi-active control technique to a bridge is outlined. Further remarks and details on future tests to be performed in LNEC shaking table, within COVICOCEPAD project, are provided.
- Relationships between head-out aquatic exercise kinematics and musical cadence: analysis of the side kickPublication . Oliveira, C.; Teixeira, Genoveva; Costa, M.J.; Marinho, D.A.; Silva, A.J.; Barbosa, Tiago M.Background: Head-out aquatic exercises became one of the most popular physical activities within the health primarily and thirdly prevention system. Music is seen as one of the most important aspects when conducting head-out aquatic exercise sessions. Research question: Is there any relationship between musical cadence and the kinematic behaviour when performing aerobic head-out aquatic exercises? It was hypothesized that an increase in music cadence will would impose a decrease of the segment range of motion. Type of study: Experimental, prospective. Methods: Six young and clinically healthy women with at least one year of experience conducting head-out aquatic classes were videotaped in the frontal plane, with a pair of cameras providing a double projection (above and below the water surface). Subjects performed an incremental protocol of five bouts (120b.min-1, 135b.min-1, 150b.min-1, 165b.min-1 and 180b.min-1) with 16 full cycles of the “side kick” exercise. Data processing and calculation of segmental (i.e. hands and feet) and anatomical landmark (i.e. centre of mass) were performed using the software Ariel Performance Analysis System and applying the DLT algorithm. Results: There was a decrease in the cycle period during the incremental protocol. The relationships between the segmental lateral and vertical displacements with the musical cadence were not significant. The segmental velocities on the lateral and vertical components showed significant increases throughout the incremental protocol. Conclusions: The data suggest that segmental velocity increases with increasing cadence, reducing the cycle period and maintaining the segmental displacements.
- The influence of musical cadence into aquatic jumping jacks kinematicsPublication . Costa, M.J.; Oliveira, C.; Teixeira, Genoveva; Marinho, D.A.; Silva, A.J.; Barbosa, Tiago M.The aim of this study was to analyze the relationships between the head-out aquatic exercise “Jumping jacks” kinematics and the musical cadence in healthy and fit subjects. Five young women, with at least one year of experience conducting headout aquatic programs were videotaped in the frontal plane, with a pair of cameras providing a double projection (above and below the water surface). Subjects performed an incremental protocol of five bouts (120 b·min-1, 135 b·min-1, 150 b·min-1, 165 b·min-1 and 180 b·min-1) with 16 full cycles of the “Jumping jacks” exercise. Data processing and calculation of upper limbs’ (i.e. hands), lower limbs’ (i.e. feet) and center of mass’ 2D linear velocity and displacement were computed with the software Ariel Performance Analysis System and applying the 2DDLT algorithm. Subjects decreased the cycle period during the incremental protocol. Significant and negative relationships with the musical cadence were verified for the center of mass and upper limbs vertical displacement. On the other hand, for the lower limbs lateral velocity, a significant and positive relationship was observed. It is concluded that expert and fit subjects increase the lower limb’s velocity to maintain the range of motion, while the upper limb’s displacement is reduced to coupe the music cadence.