Browsing by Author "Castro, Marcelo Peduzzi"
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- Caracterização cinética e cinemática da marcha de indivíduos adultos obesosPublication . Sousa, Helena; Santos, Rubim; Vilas Boas, João; Vaz, M.; Abreu, Sofia; Castro, Marcelo PeduzziO presente estudo apresenta a caracterização cinemática e cinética da marcha de indivíduos obesos. Envolveu instrumentos como Pedar-Novel, para recolha de dados da pressão plantar; Plataforma Bertec 4060-10, para dados de Força de Reacção ao Solo (FRS), Câmaras digitais Sony, 50Hz para ângulos do pé; IPAQ para dados de actividade física. Foram seleccionados individuos com IMC≥30Kg/m2, para o grupo experimental e com IMC≤ 30Kg/m2 para o grupo controlo. Os resultados mostraram pelos valores de FRS e respectivos tempos de ocorrência que indivíduos obesos, quando comparados com indivíduos eutróficos, exercem forças superiores ocasionando uma sobrecarga mecânica ao nível do sistema músculo-esquelético.
- Force and pressure analysis during occasional loaded gaitPublication . Castro, Marcelo Peduzzi; Santos, Rubim; Abreu, Sofia; Sousa, Helena; Machado, Leandro; Vilas Boas, JoãoThe aim of this study was to compare the ground reaction forces and plantar pressure parameters between unloaded and occasional loaded gait. The ground reaction forces and plantar pressure of 60 participants were recorded during unloaded and occasional loaded gait (wearing a backpack which raises the participant´s body mass index to 30). The results indicate an overall increase of forces and plantar pressure during occasional loaded gait where the absolute values were analyzed (p<0.05), while the normalized values suggested a non-linear relation between backpack mass and plantar pressure increases, where the medial midfoot and toes were more required while the lateral rearfoot was less during loaded gait (p<0.05). Also, during loaded gait the magnitude of impact and propulsive forces decreased and the shear forces increased more than proportion of the load. These data suggest a different pattern of plantar pressure distribution and forces during occasional loaded when compared to unloaded gait
- Ground reaction forces and plantar pressure distribution during occasional loaded gaitPublication . Castro, Marcelo Peduzzi; Abreu, Sofia; Sousa, Helena; Machado, Leandro; Santos, Rubim; Vilas Boas, JoãoThis study compared the ground reaction forces (GRF) and plantar pressures between unloaded and occasional loaded gait. The GRF and plantar pressures of 60 participants were recorded during unloaded gait and occasional loaded gait (wearing a backpack that raised their body mass index to 30); this load criterion was adopted because is considered potentially harmful in permanent loaded gait (obese people). The results indicate an overall increase (absolute values) of GRF and plantar pressures during occasional loaded gait (p < 0.05); also, higher normalized (by total weight) values in the medial midfoot and toes, and lower values in the lateral rearfoot region were observed. During loaded gait the magnitude of the vertical GRF (impact and thrust maximum) decreased and the shear forces increased more than did the proportion of the load (normalized values). These data suggest a different pattern of GRF and plantar pressure distribution during occasional loaded compared to unloaded gait.
- In-shoe plantar pressures and ground reaction forces during overweight adults' overground walkingPublication . Castro, Marcelo Peduzzi; Abreu, Sofia; Sousa, Helena; Machado, Leandro; Santos, Rubim; Vilas Boas, JoãoPurpose: Because walking is highly recommended for prevention and treatment of obesity and some of its biomechanical aspects are not clearly understood for overweight people, we compared the absolute and normalized ground reaction forces (GRF), plantar pressures, and temporal parameters of normal-weight and overweight participants during overground walking. Method: A force plate and an in-shoe pressure system were used to record GRF, plantar pressures (foot divided in 10 regions), and temporal parameters of 17 overweight adults and 17 gender-matched normal-weight adults while walking. Results: With high effect sizes, the overweight participants showed higher absolute medial-lateral and vertical GRF and pressure peaks in the central rearfoot, lateral midfoot, and lateral and central forefoot. However, analyzing normalized (scaled to body weight) data, the overweight participants showed lower vertical and anterior-posterior GRF and lower pressure peaks in the medial rearfoot and hallux, but the lateral forefoot peaks continued to be greater compared with normal-weight participants. Time of occurrence of medial-lateral GRF and pressure peaks in the midfoot occurred later in overweight individuals. Conclusions: The overweight participants adapted their gait pattern to minimize the consequences of the higher vertical and propulsive GRF in their musculoskeletal system. However, they were not able to improve their balance as indicated by medial-lateral GRF. The overweight participants showed higher absolute pressure peaks in 4 out of 10 foot regions. Furthermore, the normalized data suggest that the lateral forefoot in overweight adults was loaded more than the proportion of their extra weight, while the hallux and medial rearfoot were seemingly protected.
- Shoulder kinematics is not influenced by external load during elevation in the scapular planePublication . Castro, Marcelo PeduzziThe current study aimed to compare the shoulder kinematics (3D scapular orientation, scapular angular displacement and scapulohumeral rhythm) of asymptomatic participants under unloaded and loaded conditions during unilateral shoulder elevation in the scapular plane. We used a repeated-measures design with a convenience sample. Eleven male participants with an age range of 21–28 years with no recent history of shoulder injury participated in the study. The participants performed isometric shoulder elevation from a neutral position to approximately 150 degrees of elevation in the scapular plane in intervals of approximately 30 degrees during unloaded and loaded conditions. Shoulder kinematic data were obtained with videogrammetry. During shoulder elevation, the scapula rotated upwardly and externally, and tilted posteriorly. The addition of an external load did not affect 3D scapular orientation, scapular angular displacement, or scapulohumeral rhythm throughout shoulder elevation (P > .05). In clinical practice, clinicians should expect to observe upward and external rotation and posterior tilt of the scapula during their assessments of shoulder elevation. Such behavior was not influenced by an external load normalized to 5% of body weight when performed in an asymptomatic population.
- The influence of differente speeds on backpacker's gait kinecticsPublication . Castro, Marcelo Peduzzi; Abreu, Sofia; Sousa, Helena; Figueiredo, Cristina; Machado, Leandro; Santos, Rubim; Vilas Boas, JoãoThis study analyzed the influence of different speeds on ground reaction force’s (GRF), impulses and mean vertical force during gait of people submitted to occasional overload (backpack). A force plate was used to record the GRF data of 60 young adult subjects walking in two different cadences: 69 steps/min (slow gait) and 120 steps/min (fast gait). During the slow gait, the impact and propulsive impulses of vertical GRF, propulsive impulse of anterior-posterior GRF, impulse of medial-lateral GRF and duration of stance phase were larger than during the fast gait; the mean vertical force was the only variable that showed larger values during fast gait. Therefore, slow gait may present a larger possibility of blister development and gait unbalance, while the fast gait, even presenting a small impulse, seems to be more harmful to the musculoskeletal system.