Related Experiment Videos
Standing up from a chair as a dynamic equilibrium task: a comparison between young and elderly subjects
Summary
Elderly individuals exhibit altered center of mass (CoM) control during sit-to-stand (STS) movements, showing reduced velocity and backward shifts. These age-related changes in balance control are more pronounced when visual input is limited.
Area of Science:
- Biomechanics
- Gerontology
- Human Movement Science
Background:
- Sit-to-stand (STS) is a fundamental daily activity.
- Age-related decline in motor control can impact functional mobility.
- Understanding changes in center of mass (CoM) control is crucial for fall prevention in the elderly.
Purpose of the Study:
- To compare anterior/posterior center of mass (CoM) control during sit-to-stand (STS) between young and elderly adults.
- To investigate the influence of visual conditions and speed on CoM dynamics during STS.
- To identify age-related differences in balance control strategies during STS.
Main Methods:
- Utilized a dynamic equilibrium area (DEA) concept to assess balance limits.
- Measured CoM velocity and displacement in young (n=7) and elderly (n=7) healthy subjects.
- Varied experimental conditions: normal vision, blindfolded, normal speed, and fast speed.
Main Results:
- Elderly subjects demonstrated lower maximal CoM velocity and lower CoM velocity at seat-off compared to young subjects.
- The difference in maximal CoM velocity between age groups increased under blindfolded conditions.
- At seat-off, elderly subjects showed a backward shift in CoM position in the phase plane (velocity vs. displacement).
Conclusions:
- Age-related modifications in horizontal CoM motion control are evident during STS in healthy elderly individuals.
- Visual deprivation exacerbates age-related differences in CoM velocity control during STS.
- Altered CoM control strategies in the elderly during STS may contribute to balance impairments.