Browsing by Author "Teles, Ivone da Silva"
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- Association between the History of Fall and the Fear of Falling on stair descent and gait transition spatio-temporal parameters and lower limb kinetics and kinematics in older adults: an observational studyPublication . Teles, Ivone da Silva; Sousa, Andreia; Moreira, Juliana; Silva, AugustaIt has been estimated that 20% of the falls in older adults occur on stairs, mostly during stair descent during gait transition. Although History of Fall and Fear of Falling are related to a higher risk of falling in older adults, their association with biomechanical changes in this functional task has yet to be established. To evaluate the association between History of Fall and Fear of Falling on spatio-temporal, lower limb kinetic and kinematic parameters in older adults during stair descent and gait transition. Sixty older adults (>60 years) were evaluated through an optoelectrical motion capture system and two force plates during stair descent and gait transition. For the analysis it was used the mean value of the task velocity and time, single and double-support time, peak downwards center of mass velocity, hip, knee and ankle position, range of motion and power, foot clearance and foot placement, assessed using a multivariate analysis of variance. FOF exhibited longer task (p=0.009), double-support (p=0,047) and single-support (p=0,009) times and reduced peak downwards CoM velocity (p=0,043). In the stair cycle, FOF exhibited increased ankle power at heel-strike (p=0.026). In the gait cycle, HOF exhibited reduced initiating ankle angle at toe-off (p=0,015), increased initiating hip power at heel-strike (p=0,024) and contralateral ankle power at toe-off (p=0,029). FOF presented reduced initiating ankle angle at heel-strike (p=0.041) and toe-off (p=0.026) and reduced contralateral ankle angle at toe-off (p=0.022). Conclusion: In older adults, History of Fall and Fear of Falling are associated with changes in biomechanical parameters during stair descent and gait transition, consistent with the use of more conservative strategies to avoid falling.
- Principal component analysis of stair negotiation and floor transition kinematics in older adults with and without functional disability: cross-sectional studyPublication . Moreira, Juliana; Teles, Ivone da Silva; Cunha, Bruno; Félix, José; Guedes, Diana C.; Alves, Leonel A. T.; Santos, Rubim; Sousa, Andreia S P; Pinheiro de Sousa, Andreia Sofia; Rubim Silva Santos, Manuel; Santos Moreira, Juliana; Sousa Félix, José ManuelStair negotiation (ascending and descending) and transitions to level walking are complex motor tasks influenced by aging; yet the impact of functional disability on these changes remains underexplored. This study aimed to evaluate the lower limb joint positions, velocities, and the center of mass (CoM) displacement and velocity during stair negotiation and transitions in older adults with and without functional disability. Sixty community-dwelling adults, aged 60 years and older, were assessed for lower limb tridimensional joint positions and velocities during the instances of foot contact or leaving the step and foot contact or leaving the floor; the joint range of motion, angular velocity range, and the CoM displacement and angular velocity range were assessed during stair ascend and descend and transitions floor-to-stair and stair-to-floor through an optoelectronic system. Principal component analysis was used to assess 8 groups of variables to compute principal component models (I-VIII). Participants were classified as with or without disability based on functional disability indicators. Group differences were assessed using the Mann-Whitney U test. From 240 variables, 41 key parameters were identified, mainly related to hip and knee angular velocities in the sagittal plane. Significant differences between older adults with disability (n=25) and without disability (n=35) were found in 12 principal components. Older adults with functional disability showed changes in the sagittal plane hip as well as in the knee angular velocity and mediolateral and vertical CoM displacement and velocity during stair negotiation and transitions. These findings can inform targeted strategies to improve mobility and stability in this population.