Swedish School of Sport and Health Sciences, Stockholm, Sweden.
Int J Sports Physiol Perform. 2014 Mar;9(2):365-70. doi: 10.1123/ijspp.2012-0333. Epub 2013 Jul 30.
The purpose was to develop and validate portable force-measurement devices for recording push and pull forces applied by each foot to the foot bar of a kayak and the horizontal force at the seat. A foot plate on a single-point force transducer mounted on the kayak foot bar underneath each foot allowed the push and pull forces to be recorded. Two metal frames interconnected with 4 linear ball bearings, and a force transducer allowed recording of horizontal seat force. The foot-bar-force device was calibrated by loading each foot plate with weights in the push-pull direction perpendicular to the foot plate surface, while the seat-force device was calibrated to horizontal forces with and without weights on the seat. A strong linearity (r2 = .99-1.0) was found between transducer output signal and load force in the push and pull directions for both foot-bar transducers perpendicular to the foot plate and the seat-force-measuring device. Reliability of both devices was tested by means of a test-retest design. The coefficient of variation (CV) for foot-bar push and pull forces ranged from 0.1% to 1.1%, and the CV for the seat forces varied from 0.6% to 2.2%. The current study opens up a field for new investigations of the forces generated in the kayak and ways to optimize kayak-paddling performance.
目的是开发和验证用于记录划桨者双脚施加在划艇脚杆上的推、拉力以及施加在座垫上的水平力的便携式测力装置。每个脚下方安装在脚杆上的单点力传感器上的脚踏板，可用于记录推、拉力。两个金属框架通过 4 个线性滚珠轴承相互连接，并安装一个力传感器，用于记录水平座垫力。通过在垂直于脚踏板表面的推、拉方向上对每个脚踏板加载重量，对脚杆力装置进行校准，而在座垫上施加和不施加重量的情况下，对座垫力装置进行水平力校准。发现两个力传感器的输出信号与垂直于脚踏板的脚杆和座垫测力装置的推、拉力之间具有很强的线性关系（r2=.99-1.0）。通过测试-再测试设计来测试两个装置的可靠性。脚杆推、拉力的变异系数（CV）范围为 0.1%至 1.1%，座垫力的 CV 范围为 0.6%至 2.2%。本研究为进一步研究划艇中产生的力以及优化划桨性能的方法开辟了新的领域。
