Knol, H. (Hester) (2012) The effects of gradual and sudden dynamic perturbations on locomotor adaptation and retention. thesis, Human Movement Sciences.
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Abstract
Abstract- The study of adaptation to perturbations in walking is one of the main sources of information about (loco-) motor learning and adaptation. The method of the presentation of perturbations is one important aspect of motor learning. Previous arm reaching studies showed an improved adaptation effect when perturbations were presented gradually and a faster adaptation when subjects were re-exposed to the perturbation on a short-term. This does not automatically imply similar adaptation principles in locomotor systems. Therefore it should be studied whether these learning principles count for locomotion as well. The aim of this study was to determine whether suddenly or gradually applied perturbations during walking revealed differences in strategies to generate locomotor adaptation and retention. Twenty healthy subjects walked with either a suddenly applied dynamic perturbation or gradually increasing dynamic perturbation for a period of 120 steps. After 120 steps in a washout condition without a perturbation, they were re-exposed to a suddenly applied perturbation for 50 steps. Leg muscle activity, joint kinematics and step characteristics were measured and analyzed. Both groups adapted their locomotor patterns to the dynamic perturbation, resulting in strong aftereffects in step parameters, kinematics and muscle activity. Magnitude of aftereffects was similar for both groups, indicating that the subjects did not adapt their locomotion pattern differently. During re-exposure to the perturbation subjects immediately returned to the same level of adaptation as during the final level of adaptation during the first exposure. This shows that both groups equally retained information from the first exposure and adapted their initial response to the re-exposure accordingly. These findings suggest that differences in tasks do not always result in different adaptation strategies. Keywords: adaptation, dynamic perturbations, gait, retention.
| Item Type: | Thesis (Thesis) |
|---|---|
| Supervisor name: | Otter, Dr. A.R. den and Center for human movement sciences, University ofGroningen |
| Supervisor name: | Asseldonk, Dr. E.H.F. van and Biomechanical engineering, University ofTwente |
| Faculty: | Medical Sciences |
| Date Deposited: | 25 Jun 2020 11:05 |
| Last Modified: | 25 Jun 2020 11:05 |
| URI: | https://umcg.studenttheses.ub.rug.nl/id/eprint/2543 |
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