Hendriks, S. (Sharon) (2015) De ‘zwabbervoet’. Een oriënterende case-control studie. thesis, Medicine.
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Abstract
The ‘wobbly foot syndrome’, or ‘zwabbervoet’ in Dutch, is a well-known affection among ice-skaters, multiple skaters stopped their professional carrier because of this mysterious affection. The wobbly foot is a sudden outward movement deviation, affecting one of both legs of the skaters, and causing diminished speed and increased fatigue during ice-skating. Despite the awareness among ice-skaters, except for a case-study, we could not find any literature about this subject. This is why we want to know more about this mysterious affection, which is the goal of our research. Preceding this research, 2 theories of what might cause this affection came up. We suppose that the wobbly foot syndrome might be caused by a task specific dystonia, or that the wobbly foot can be an effect of an overruling autonomic correction of impeding balance difficulties. My research is following a preceding research. During this earlier research, some data has been collected already. During this preceding research, there was a considerable difference between the length of the gliding phase of the affected leg and the healthy leg. Because of this, two research questions came up. 1. Is there an asymmetry in the length of the gliding phase between both legs of healthy skaters without a wobbly foot? 2. What is the effect of several extern factors on the wobbly foot? In the preceding research, in July 2014, five skaters with a wobbly foot syndrome have been examined. A questionnaire was taken, in order to have some more information about the origin of the affection and factors that affected the affection and a neurological exam was taken. Besides this, the subjects were recorded on video while skating there normal skating strides, while they were performing a ‘steigerung’ and while they were skating with and extra mass around their ankles. The movement was captured with Inertial Motion Capturing (IMC), which recorded the angle velocity and acceleration of the feet of the subjects. In this case-control study, five more skaters without wobbly foot, were examined. Their skating strides were also captured on video and with IMC. In the results of this research, a significance difference was found between the length of the gliding phase of the affected leg and the healthy leg in the subjects with wobbly foot as well as between the length of the gliding phase of the right leg and the left leg in healthy controls. Next to this, the angular velocity stayed the same during the wobbly movement of the leg or even increased. From the results we found during this research, we can conclude that the difference in length of the gliding phase between the affected leg and the healthy leg, is not specific for the wobbly foot syndrome, because not affected skaters have a difference between both legs as well. From the fact that the angular velocity of the wobbly movement increased or stayed the same, but never decreases, we can conclude that the wobbly movement has to be an active muscle driven movement, which makes the hypotheses that the wobbly foot syndrome is a task-specific dystonia, more likely.
| Item Type: | Thesis (Thesis) |
|---|---|
| Supervisor name: | Koning-Tijssen, Prof. Dr. M.A.J. de and Otten, Prof. Dr. E. |
| Faculty: | Medical Sciences |
| Date Deposited: | 25 Jun 2020 11:04 |
| Last Modified: | 25 Jun 2020 11:04 |
| URI: | https://umcg.studenttheses.ub.rug.nl/id/eprint/2412 |
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