Practice-related improvements in posture control differ between young and older adults exposed to continuous, variable amplitude oscillations of the support surface
| Autor: | Fay B. Horak, Karen Van Ooteghem, James S. Frank |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Adult
Male Aging medicine.medical_specialty Posture Neuropsychological Tests Article Developmental psychology Disability Evaluation Young Adult Physical medicine and rehabilitation Orientation Physical Stimulation Task Performance and Analysis Reaction Time medicine Postural Balance Humans Learning Young adult Muscle Skeletal Motor skill Aged Balance (ability) Aged 80 and over Leg Proprioception Teaching General Neuroscience Middle Aged Adaptation Physiological Trunk medicine.anatomical_structure Motor Skills Female Ankle Motor learning Psychology Ankle Joint Muscle Contraction |
| Zdroj: | Experimental Brain Research. 199:185-193 |
| ISSN: | 1432-1106 0014-4819 |
| DOI: | 10.1007/s00221-009-1995-y |
| Popis: | Healthy older adults were repeatedly exposed to continuous, variable amplitude oscillations of the support surface to determine 1) whether age affects the capacity for postural motor learning under continuous perturbation conditions with limited predictability and 2) whether practice leads to modifications in the control strategy used to maintain balance in older adults. During training, a translating platform underwent 45-second trials of constant frequency (0.5 Hz) and seemingly random amplitude oscillations (range ± 2 to 15 cm). The middle 15 seconds of each trial contained the same sequence of oscillation amplitudes. This repeated middle segment was used for analyses because young adults in Van Ooteghem et al (2008) experienced the same segment, allowing group comparisons to be made in the present study. To examine learning, participants performed a retention test following a 24-hour delay. Kinematic data were used to derive spatial and temporal measures of whole body centre of mass (COM), trunk, thigh, and shank segment orientation, and ankle and knee angle from performance during the repeated middle segment. Results showed that with training, older adults maintained the capacity to learn adaptive postural responses in the form of improved temporal control of the COM and minimization of trunk instability at a rate comparable to young adults. With practice however, older adults maintained a more rigid, ‘platform-fixed’ control strategy which differed from young adults who shifted toward ‘gravity-fixed’ control that minimized their COM motion. This study provides important insight into the ability of older adults to demonstrate longer-term improvements in postural regulation. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink