Correlação da força vertical de reação do solo e da velocidade angular do joelho de jovens e idosas durante descida de escada (original) (raw)
Related papers
2015
1 Universidade Estadual Paulista, Faculdade de Ciências e Tecnologia, Programa de Pós-graduação em Fisioterapia, Laboratório de Biomecânica e Controle Motor. Presidente Prudente, SP, Brasil. 2 Universidade Estadual do Oeste do Paraná, Centro de Ciências Biológicas e da Saúde, Departamento de Fisioterapia. Cascavel, PR, Brasil. 3 Universidade Estadual do Oeste do Paraná, Centro de Ciências Biológicas e da Saúde, Departamento de Fisioterapia, Laboratório de Pesquisa do Movimento Humano. Cascavel, PR, Brasil.
Revista Brasileira de Geriatria e Gerontologia, 2015
Objective : Comparison of the biomechanical parameters (spatiotemporal and kinetic) during walking of young people, falling, and non-falling elderly persons. Methods : A cross-sectional study was performed of 29 individuals divided into three groups: young persons (n=10); falling elderly individuals (n=7) and non-falling individuals (n=12). Gait analysis was performed based on the recording of three walking gait cycles along an 8 meter platform, which was attached to a force plate with a recording frequency of 200 Hz. Gait cycles were also recorded by three video cameras positioned perpendicular to the force plate with a recording frequency of 60 Hz. The data analyzed was: average step velocity, stance time, Froude number and anteroposterior ground reaction force. Results : The average step velocity was higher among young persons and there was no difference in the Froude number among the three groups. During the stance and impulse phase, anterior and posterior force was higher among...
Kinematic and kinetic characteristics of stepping over a 10-cm-high obstacle in older adults
Aino Journal, 2010
The purpose of this research was to clarify the common responses shared by a high-falldown-risk group of older adults and develop an exercise-learning program to prevent falls. [Subjects] Thirty-four subjects were chosen from those who use the daycare program of a nursing home at least once a week. [Methods] All subjects were categorized in longer or shorter-MSL groups. Ninety-second stepping from two force plates to a 10-cmhigh box was executed under three conditions. The locus length of the COP, toe-obstacle distance, and step length were used as experimental data. [Results] The coefficient between the MSL and COP was from 0.69 to 0.73. The shorter-MSL group showed smaller COP movements in the A-P direction and a smaller toe-obstacle distance between the single stepping and stepping with the visual task and between the single stepping and stepping with the auditory task. No significant difference was noted in the step length between the two groups. [Conclusion] The shorter-MSL group was easily affected by the dual-task, suggesting that the shorter-MSL group has a high risk of falling when negotiating obstacles. Stepping exercise with the dual-task using the COP movements as a feedback index may be useful for older adults who have a smaller MSL.
Dynamic stability control in younger and older adults during stair descent
Human Movement Science, 2012
The purpose of this study was to examine dynamic stability control in older and younger adults while descending stairs. Thirteen older (aged 64-77 years) and 13 younger (aged 22-29 years) adults descended a staircase at their preferred speed. A motion capture system and three force plates were used to determine locomotion mechanics. Dynamic stability was investigated by using the margin of stability, calculated as the instantaneous difference between anterior boundary of the base of support and extrapolated centre of mass. At the initiation of the single support phase, older adults demonstrated a more negative (p < .05) margin of stability value. The component responsible for the lower margin of stability in the elderly was the higher velocity of the centre of mass (p < .05). Before the initiation of the single support phase, the older adults showed a lower (p < .05) ankle and knee joint angular impulse compared to the younger ones. We found a significant correlation (r = .729, p < .05) between centre of mass velocity and joint angular impulse. These results indicate that older adults are at greater risk of falls while descending stairs potentially due to a reduced ability to generate adequate leg-extensor muscular output to safely control the motion of the body's centre of mass while stepping down.
Biomechanical Analysis of Older Adults Stepping Up: A Method of Evaluating Balance
Journal of Aging and Physical Activity, 2008
The aim of this study was to analyze differences in biomechanical parameters between elderly and control participants when stepping up, to evaluate control of balance. Eleven control and 14 elderly participants performed a step from an initial static posture onto a 7-cm-high force plate. For the spontaneous-velocity condition, elderly participants performed a slower progression velocity than control participants. Elderly participants spent proportionally more time in stance phase, with a corresponding decrease in swing phase, than the control participants, irrespective of movement velocity. In contrast, at spontaneous velocity the parameters related to ground-reaction force (GRF) showed that anteroposterior and mediolateral forces at toe-off of the support limb and the slope of vertical force during weight transfer were significantly smaller for the elderly than for control participants. These GRF parameters depended on the stepping-up velocity. The elderly develop a spatiotemporal ...
Human movement science, 2015
Angular momentum of the body is a highly controlled quantity signifying stability, therefore, it is essential to understand its regulation during stair descent. The purpose of this study was to investigate how older adults use gravity and ground reaction force to regulate the angular momentum of the body during stair descent. A total of 28 participants (12 male and 16 female; 68.5years and 69.0years of mean age respectively) performed stair descent from a level walk in a step-over-step manner at a self-selected speed over a custom made three-step staircase with embedded force plates. Kinematic and force data were used to calculate angular momentum, gravitational moment, and ground reaction force moment about the stance foot center of pressure. Women show a significantly greater change in normalized angular momentum (0.92Nms/Kgm; p=.004) as compared to men (0.45Nms/Kgm). Women produce higher normalized GRF (p=.031) during the double support phase. The angular momentum changes show la...
Journal of Rehabilitation Medicine, 2004
The aim of this study was to evaluate the relationship between knee pain and various indicators of the combined performance of the lower extremity (including gait parameters, functional performance such as timed up and go, and functional reach test) and to determine whether the classification of vertical ground reaction forces correlates with gait parameters and functional performance. Subjects and Methods: Simultaneous analysis of gait, timedistance parameters and vertical ground reaction force. Timed up and go, and functional reach test were examined in 130 elderly women. The vertical component of the ground reaction force was grouped into 2 categories: M-shaped and non-M-shaped. Results: No significant association was found between knee pain and timed up and go, functional reach test, or gait parameters in elderly female participants. There were significant differences between subjects with M-and non-M-shaped vertical ground reaction forces with regard to timed up and go, functional reach test and Japan Orthopaedic Association score. There were also significant differences between the 2 groups (M shaped and non-Mshaped) in gait parameters. Conclusion: Evaluation of the vertical ground reaction force to determine its shape may be a useful and simple tool in the analysis of gait and functional performance.