スピードスケート滑走中のブレード反力(1部技能)

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Some investigators have attempted to measure push-off forces in speed skating at different velocities. However, the relationship between the push-off forces and the skating velocity is still unclear because there is little information on the directions of the push-off forces and skating velocity. The purposes of this study were to develop a sensor-skate which could measure two components of force applied to the skate blade, and to investigate characteristics of the blade reaction forces on ice surface and their relationships to skating velocity. The sensor-skate consisted of a pair of sensor elements between the shoe and the skate blade to detect forces in both lateral/medial and vertical directions to the shoe sole. Linear regressions between the signals from the sensors and the forces applied were determined with different load conditions, and cross-talk from the lateral/medial force to the signal in the vertical direction was also calculated. Ten male speed skaters, including a world record holder at 1000m, served as subjects. At two different skating velocities, the force signals via strain amplifier were stored (100 Hz) in two data-loggers fixed on the skater's back. Blade reaction forces (BRF) in the coordinate system fixed on the ice were obtained by transformation of the force signals measured in the sensor-coordinates, based on the lean angle of the blade measured with VTR cameras (60 fields/s). Both vertical and horizontal components of BRF, point of BRF application and free moment about the vertical axis were calculated. The results obtained were summarized as follows: 1) Lean angle of the blade at the onset and end of the stroke were larger in fast skating (11.5±0.8 [m/s] ) than in slow skating (9.3±0.5 [m/s] ). 2) Peak value of the vertical component of the BRF was larger in fast skating than in slow skating. 3) Peak and mean of the horizontal medial component of the BRF were larger in fast skating than in slow skating. 4) Point of BRF application at the end of the stroke was located further forward in fast skating than in slow skating. 5) Peak magnitude of the free moment of internal rotation about the vertical axis was larger in fast skating than in slow skating. The onset of the horizontal medial component of fast skating was much earlier in the world record holder than in the other subjects.
1996-07-25

スピードスケート滑走中のブレード反力(1部技能)

スポンサーリンク

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スポンサーリンク

スピードスケート滑走中のブレード反力(1部 技能)

スポンサーリンク

概要

著者

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スポンサーリンク

スピードスケート滑走中のブレード反力(1部技能)