Estimation of the energy loss at the blades in rowing : common assumptions revisited
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Deutscher übersetzter Titel: | Bestimmung des Energieverlusts an den Ruderblättern : Revision gängiger Annahmen |
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Autor: | Hofmijster, Mathijs; Koning, Jos de; Soest, A.J. van |
Erschienen in: | Journal of sports sciences |
Veröffentlicht: | 28 (2010), 10, S. 1093-1102, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource |
Sprache: | Englisch |
ISSN: | 0264-0414, 1466-447X |
DOI: | 10.1080/02640414.2010.495994 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU201104003404 |
Quelle: | BISp |
TY - JOUR AU - Hofmijster, Mathijs A2 - Hofmijster, Mathijs A2 - Koning, Jos de A2 - Soest, A.J. van DB - BISp DP - BISp KW - Antrieb KW - Effektivität KW - Fortbewegung KW - Kinematik KW - Kinetik KW - Kraftübertragung KW - Ruderblatt KW - Rudern KW - Rudersport KW - Sportgerät KW - Sportgeräteforschung KW - Vortrieb KW - Wassersport LA - eng TI - Estimation of the energy loss at the blades in rowing : common assumptions revisited TT - Bestimmung des Energieverlusts an den Ruderblättern : Revision gängiger Annahmen PY - 2010 N2 - In rowing, power is inevitably lost as kinetic energy is imparted to the water during push-off with the blades. Power loss is estimated from reconstructed blade kinetics and kinematics. Traditionally, it is assumed that the oar is completely rigid and that force acts strictly perpendicular to the blade. The aim of the present study was to evaluate how reconstructed blade kinematics, kinetics, and average power loss are affected by these assumptions. A calibration experiment with instrumented oars and oarlocks was performed to establish relations between measured signals and oar deformation and blade force. Next, an on-water experiment was performed with a single female world-class rower rowing at constant racing pace in an instrumented scull. Blade kinematics, kinetics, and power loss under different assumptions (rigid versus deformable oars; absence or presence of a blade force component parallel to the oar) were reconstructed. Estimated power losses at the blades are 18% higher when parallel blade force is incorporated. Incorporating oar deformation affects reconstructed blade kinematics and instantaneous power loss, but has no effect on estimation of power losses at the blades. Assumptions on oar deformation and blade force direction have implications for the reconstructed blade kinetics and kinematics. Neglecting parallel blade forces leads to a substantial underestimation of power losses at the blades. Verf.-Referat L2 - https://dx.doi.org/10.1080/02640414.2010.495994 DO - 10.1080/02640414.2010.495994 SP - S. 1093-1102 SN - 0264-0414 JO - Journal of sports sciences IS - 10 VL - 28 M3 - Gedruckte Ressource ID - PU201104003404 ER -