Stoter, I.K. (Inge) (2012) The effect of pacing strategy on muscle fatigue and technique in 1500m speed skating and cycling. thesis, Human Movement Sciences.
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Abstract
Objective: Speed skating is a complex sport with high isometric forces, peculiar technique and variable crouched position. Previous pacing studies showed that athletes in a similar but less complex sport as cycling approaches the theoretical optimal pacing strategy for a 1500m better than speed skaters. Speed skaters struggle with the more optimal faster start. To figure out why, this study will investigate and compare the effects of a faster start. on muscle fatigue and technique in a 1500m speed skating and cycling trial. Method: Nine well trained sub elite male speed skaters and nine well trained sub elite male cyclists performed two 1500m time trials in their sport of expertise. Athletes were instructed to start faster (FS) or slower (SS) than they are accustomed to. Velocity and heart rate were measured during the trial. Furthermore, knee, hip and trunk angles were measured to track changes in technique and aerodynamics. The relative level of intensity was estimated by blood lactate and maximal voluntary contraction (MVC), voluntary activation (VA) and potentiated rest twitch were used to estimate the central and peripheral contribution to muscle fatigue. Results: 300m split times were faster during the FS trials in both sports, but did not lead to faster end times. The faster start in cycling resulted in higher blood lactate 5 to 35 minutes after the trial in cycling. Blood lactate in speed skating was similar for both trials, but trunk angles were higher during the entire FS trial resulting in higher air-resistance with respect to the SS trial. MVC, VA and potentiated rest twitch decreased in both trials in cycling, suggesting both central and peripheral contribution to muscle fatigue. In speed skating only the potentiated rest twitch in the FS trial decreased significantly. This could indicate a dominant contribution of peripheral fatigue. Conclusion: Velocity profiles and blood lactate values suggest that the FS trial in cycling was of a higher relative intensity than the SS trial and also than both speed skating trials Muscle fatigue in cycling seems to be induced peripheral as well as central, whereas a dominant role of a peripheral mechanism of muscle fatigue seems to be present in speed skating. The only effect of the faster start in speed skating was on trunk angles and therewith on air-resistance. Because the faster start in speed skating did not increase the relative intensity, in contrary to cycling, it is hypothesized that higher trunk angles must have a positive effect. This positive effect is suggested to be caused by a more optimal force-length relation.
| Item Type: | Thesis (Thesis) |
|---|---|
| Supervisor name: | Supervisor: and Hettinga, F.J. and Center of Human Movement Sciences of the University of Groni |
| Supervisor name: | Maclntosh, B.R. and Human Performance Laboratory, Faculty of Kinesiology |
| Faculty: | Medical Sciences |
| Date Deposited: | 25 Jun 2020 11:03 |
| Last Modified: | 25 Jun 2020 11:03 |
| URI: | https://umcg.studenttheses.ub.rug.nl/id/eprint/2289 |
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