Brauers, L. (Lieke) (2015) Conventional calculations are not applicable for calculating fatigue in children with cerebral palsy. thesis, Human Movement Sciences.
Full text available on request.Abstract
Purpose: The purpose of this study was to evaluate if three existing methods for quantitatively measuring isometric muscle fatigue in the upper limb are usable in children with Cerebral Palsy (CP) or if a newly developed method is more adequate to use. Method: 121 Children between 6 and 18 years of age were measured with an isometric dynamometer and pinch meter. Fatigue was determined based on 30 seconds maximal voluntary contraction curve, from which time to peak, the Area Under the Curve (AUC) and the Hypothetical Area Under the Curve (HAUC) that is seen when there is no fatigue present were calculated. Previous research composed three fatigue indexes that calculated fatigue ratios based on the AUC and HAUC over different numbers of seconds of the force-time curves. Current study added one fatigue index based on the existence of huge variability in force time curves, due to the specific muscle pathology and recruitment of the muscles of children with CP. The applicability of these four fatigue calculations was compared to each other based on four exclusion criteria: ratio values below 0 and above 100, calculations in which the times to peak should be before the fifth second, but were after the fifth second, calculations were times to peak should be before the tenth second but were after the tenth second, and curves in which calculations did not start at the peak force, and thus time to peak is also included in the fatigue calculation. Fatigue calculations that led to exclusion of less than 10% of the children were considered adequate. Results and conclusion: Based on the four exclusion criteria as mentioned above, fatigue index 2 was excluded because of values below 0 and above 100. Fatigue index 3 was excluded based on the time to peak after the fifth second and fatigue index 1 was excluded based on the starting point at the time to peak. This led only fatigue index 4 to be an appropriate fatigue index. Future research: Based on known literature on biomechanical properties of the muscle and other factors contributing to fatigue like variability, it seems that the fourth fatigue index can still be made more applicable and sensitive in measuring fatigue in children with CP.
| Item Type: | Thesis (UNSPECIFIED) |
|---|---|
| Supervisor name: | Rameckers, dr. E. and Groot, dr. S. de |
| Faculty: | Medical Sciences |
| Date Deposited: | 08 Apr 2022 11:38 |
| Last Modified: | 08 Apr 2022 11:38 |
| URI: | https://umcg.studenttheses.ub.rug.nl/id/eprint/3071 |
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