Abstract: In various sliding activities or sports, such as ice skating, a desired angle for the foot plane within a boot is selected. When conditions change, such as going to a different location or even changes within the original location such as temperature changes, the original foot plane angle is no longer appropriate to give the best convenience and performance results. In order to determine the more appropriate foot plane angle the friction coefficient of the surface for which the original foot plane angle existed is determined and then the new friction coefficient is measured at the new location or under the changed conditions. The change in initial friction coefficient to the new friction coefficient is then used to determine what change should be made to the foot plane angle.

Abstract: The center point of an ice skate rocker with respect to the plane of the skater's foot, in a skating position, is adjusted without changing the contour or profile of the skate blade. This is done by adjusting the angular position of the foot inside the skating boot with a shim placed under the heel or under the ball of the foot.

Abstract: An ice rink covering system utilizes a plurality of support mechanisms for sets of non-flexible insulated panels which are interconnected by a hinge mechanism between each pair of adjacent panels. The support mechanisms are connected to the panels by lifting units for selectively moving the panels in an accordion fashion for either edge to edge contact when the panels cover a rink or side to side contact when the panels are in their stored condition.