Research On The Characteristics Of Plantar Pressure Distribution In The Double-push Roller Skating Technique

The insole kinematical data of one double-push step is obtained by using the foot-bottom pressure distribution system, Footscan Insole, from the professional inline skaters of Northeast Normal University as the research object. The purpose is to reveal the rules and features of double-push, contribute to a correct understanding of double-push, and seek a more advanced and effort-saving technique for inline skating.The main conclusion from research:First, changes with time in the insole pressure are one of the main factors that affect the speed of inline skating. The conclusion drawn from the sample tests is that, according to the changes in the double-peak curve of the insole pressure, in the first phase of one single step, the second peak pressure is a little higher than the first one, with the hint that the second push is dominating. The faster the curve peak rises, the better the effect of the push, and the higher the peak, the better the suddenness of the push, and the more the acceleration obtained.Second, the different features of conveying insole pressure represent different techniques, hence the different effects. The features of insole pressure distribution and the techniques are in consistency, according to which some slight changes can be made to improve the insole force application.Third, in one single step, the heel area touches the ground first and then passes to the front area of the insole. The lateral front insole leaves the ground first, and then first matatarsal-phalange area leaves the ground. The maximum pressure arises mainly in the heel area or the first matatarsal-phalange area. The maximum pressure area is also the area where biggest pressure changes appear. The bigger the pressure change in motion, the more liable to get injured, and hence get more protected.Forth, in one single-step slide, with the increasing speed, the traces change of the insole pressure center on the X-axis and the Y-axis are becoming less, and the insole pressure center moves forward, with the hint that double-push helps more to keep balance in fast sliding.