抄録
In trail running, runners are required to run on various surface conditions such as slope, gravel and muddy surface, it is important to design shoes for trail running with a view to stability and grip properties on those surfaces. The purpose of this study is to obtain a grip designing guide on muddy surfaces by investigating the kinetic and kinematic data in running on clay surface. 2 runners with different pronation types ran on clay surface simulating a muddy condition and tartan surfaces. Both subjects showed that the slipping distance was significantly larger on the clay surface especially in the forefoot area during propulsion. The effect of tread arrangement on outsole on the grip property was also investigated using five different tread patterns. It was concluded that the tread positioned in a high plantar pressure area or positioned towards the front was effective to improve the grip property.
