Has the klapskate hinge position effect(s) on speed skating kinematics? A case study using inertial motion capture in combination with local positioning data

Meer, D. van der (Dirk) (2012) Has the klapskate hinge position effect(s) on speed skating kinematics? A case study using inertial motion capture in combination with local positioning data. thesis, Human Movement Sciences.

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Abstract

Purpose The aim of the present case study was to examine possible effect(s) of the klapskate hinge position on speed skating kinematics using inertial motion capture and local positioning measurement data. Method One male elite Dutch speed skater performed three constant velocity submaximal 5-lap trials, which each trial a different klapskate hinge position. The participant wore a MVN Biomech lycra suit (Xsens Technologies B.V., Enschede, The Netherlands) with 17 small 3D inertial and magnetical sensors on different body segments and a local positioning (LPM) sensor on his back. Combining these datasets in a fusion scheme which utilized a biomechanical model of the human body and applied implicit knowledge, kinematical output data was gathered. Finally, data analysis was performed on the middle three laps and started with the calculation of the global positions of the center of mass (CoM) and discriminating between four different type of strokes. Results First, without LPM data, the inertial measurement system was misjudging the global positions of the body center of mass due to the gliding push-off. Second, clear distinctions between straight and curve strokes were observed, e.g. in stroke frequencies, and (left/right assymetries in) knee joint angles. Third, and most remarkable, the course of the hip and knee angle as well as the range of motion in the posterior hinge position condition were considerably smaller for every type of stroke, compared to the neutral and anterior conditions. This effect was most pronounced for the left curve stroke. Finally, mean push-off angle of the left straight stroke at the onset of push-off was larger for the posterior condition with respect to both other conditions. Conclusion Continuous motion capture revealed a lot of details of the speed skating motion. For example, the passing of one skate in front of the other during the curve stroke seemed to be resembled in the knee angle data. Differences between hinge positions, even for a relatively small range, were observed for various kinematic variables. Those results demonstrated that the participant might even have anticipated on varying hinge positions already before push-off started.

Item Type:	Thesis (Thesis)
Supervisor name:	Supervisor: and Hettinga, Dr. F .J. and Co-supervisor: and Otten, Prof. dr. E. and Center for Human Movement Sciences, University Medical Cente and Groningen, The Netherlands
Faculty:	Medical Sciences
Date Deposited:	25 Jun 2020 10:44
Last Modified:	25 Jun 2020 10:44
URI:	https://umcg.studenttheses.ub.rug.nl/id/eprint/595

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