| 摘要 |
Markers 24 are provided on a belt 20 of a treadmill 10. A video camera 50 for stride length is used to pick up an image including the foot 2 of a subject 1 running or walking over the running surface 26 of belt 20 and also markers 24. Landing of foot 2 on belt 20 is detected using this image. The positional relationship of marker 24 and one foot 2 when this foot 2 lands and also the positional relationship of marker 24 and the other foot 2 when this foot 2 lands are respectively acquired. These two positional relationships are then used to acquire the stride length of subject 1. thereby it is possible to acquire the stride length directly and with high precision, irrespective of the speed of walking/running of subject 1 or the speed of belt 20.
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