Brouwer, A.J. de (Anouk) (2011) The effects of antiphase crew rowing on rowing performance. thesis, Human Movement Sciences.
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Abstract
In competitive rowing, it is important to maximize the power output of the rower or rowing crew and minimize power losses in order to achieve high average boat velocity. Velocity fluctuations of the boat within the rowing cycle result in increased power that is needed to overcome drag compared to a boat hypothetically moving at a constant velocity. Theoretically, a possible way to minimize velocity fluctuations in crew rowing is through a rowing strategy in which pairs of rowers row out of phase (i.e. syncopated rowing). However, the ti-amework of coordination dynamics provides counterarguments for this coordination, such as the lower stability of out-of-phase coordination compared to inphase (i.e. synchronous) coordination. The aim of this study was to determine whether crew rowing with antiphase coordination results in higher velocity efficiency ( ev; the fraction of mechanical power produced by the rowers that is not lost to velocity fluctuations) and better performance compared to rowing in an inphase pattern. An additional goal was to determine the effects of antiphase rowing on interpersonal coordinative performance. Five pairs of male rowers with expetience in competitive rowing participated in four trials, in which they rowed with maximal power output at stroke rate 26 or 36 min- 1 , and with inphase or antiphase coordination. They rowed on two modified coupled rowing ergometers that allowed for power losses due to velocity fluctuations. Rowing performance was determined by calculating average power dissipated by the ergometer flywheels (Pnywhecls), average power produced by the rowers (Prowers). and velocity efficiency (ev). Furthennore, the interpersonal coordination of the rowers was determined by examining the forward-backward centre of mass movement of both rowers in terms of relative phase angle and cross-correlation. All five pairs easily managed to row with antiphase coordination. The results showed significantly higher Prowers and Pnywheels and lower ev at high instructed stroke rates (36 min-1 ) than at low stroke rates (26 min-1 ). Moreover, higher ev and reduced interpersonal coordination were found for antiphase compared to inphase coordination, while pairs with better coordination had higher ev. These results irnply that although ev significantly increased when rowing antiphase, there was no significant improvement in performance. We suggest that interpersonal coordination can be improved by training of the antiphase pattern and adjustment of drive and recovery times, resulting in higher ev. which is subsequently expected to result in better performance.
| Item Type: | Thesis (Thesis) |
|---|---|
| Supervisor name: | Poel, H.J. de and Center for Human Movement Sciences, University ofGroningen |
| Supervisor name: | Hofmijster, M.J. and Faculty of Human Movement Sciences, VrUe Universiteit Amster |
| Faculty: | Medical Sciences |
| Date Deposited: | 25 Jun 2020 10:50 |
| Last Modified: | 25 Jun 2020 10:50 |
| URI: | https://umcg.studenttheses.ub.rug.nl/id/eprint/1088 |
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