Borghuis, A.J. (Jan) (2008) Core Muscle Response Times and Balance Performance in Soccer Players and Sedentary Subjects. thesis, Human Movement Sciences.
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Abstract
Study Design. Sudden trunk loading in the frontal and sagital plane was used to study trunk muscle reflex latencies and kinematic response data in 10 high level amateur soccer players and 11 sedentary subjects. Besides, balance performance in an unstable sitting task was measured. Objectives. The present study contributes in the search for a practical way to measure core stability. The objective is to determine whether sporting subjects will exhibit shorter average muscle reflex latencies, which will be associated with less seat movement in response to perturbations and better balance performance in unstable sitting. Summary of Background Data. Delayed trunk muscle response times repeatedly have been reported in patients with low back pain. It may be expected, but has not yet been investigated, that sporting subjects will show shorter trunk muscle reflex delays compared to healthy sedentary subjects. With respect to the relationship between reflex delay and balance performance, hitherto only one study demonstrated a correlation between poor postural control of the trunk and longer trunk muscle response times. Methods. Response to sudden trunk loading was recorded from 6 major trunk muscles acting antagonistic to the perturbation moment using surface electromyography. Kinematic data of the balance seat in response to a perturbation was determined using gyroscopes measuring angular velocity. The unstable sitting test was accomplished by attaching a hemisphere with a small diameter underneath the balance seat. Subjects performed trials with eyes open and eyes closed, while seat displacement was measured by gyroscopes. Differences in reflex latencies, kinematic data of the seat in response to a perturbation and sitting balance performance between sporting and sedentary subjects were tested with a Mann-Whitney U test. Muscle reflex latencies and seat kinematic data were correlated using Spearman's rho correlation coefficient. Results. Sporting subjects demonstrated shorter reflex latencies compared to sedentary subjects for the rectus abdominis and erector spinae muscles. These shorter reflex latencies went along with greater seat movement in response to sudden trunk loading, with moderate correlations between the two measures. No differences were found in balance performance during unstable sitting between the two groups. Conclusions. Sporting subjects showed shorter reflex latencies for the erector spinae and rectus abdominis muscles in response to sudden trunk loading. These shorter latencies were accompanied by greater and more active balancing movements.
| Item Type: | Thesis (Thesis) |
|---|---|
| Supervisor name: | Hof, Dr. ir. A.L. and Lemmink, Dr. K.A.P.M. |
| Faculty: | Medical Sciences |
| Date Deposited: | 25 Jun 2020 10:41 |
| Last Modified: | 25 Jun 2020 10:41 |
| URI: | https://umcg.studenttheses.ub.rug.nl/id/eprint/248 |
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