Figure 5. (a) Acceleration caused the resultant force of the external forces, primarily the ground reaction force through a ski. During 20–80% of the time, the acceleration remained relatively constant in the LW10-2/LW11 skier. On the other hand, it gradually increased in the LW12-2 skier. The decrease in the acceleration at approximately 10% of the time is a feature unique to sit-skiing. (b) Length of suspension unit. A suspension unit lengthened during 0–20% of the time. This would reflect a turn switching technique using the spring built into a suspension unit. (c) Vertical distance between neck and hip joints. The normal direction of the ski running surface was defined as the vertical one. The distance at 0% time was shown as the reference distance (0 m).