Fig. 4
From: Key transition technology of ski jumping based on inertial motion unit, kinematics and dynamics
Example data of angle parameter (half of the sum of both sides of the lower limbs, average of eight subjects) from the inrun (a), early flight (b) and landing phases (c) [%, T1: straight inrun moment, T2: straight turn into arc moment, T3: middle of the curve of the inrun moment, T4: start of the takeoff moment (end of the inrun moment), T5: centre of gravity projection leaving the platform, T6: start of early flight moment, T7: start of stable flight moment, T8: middle of the stable flight moment, T9: 0.36 s before the landing moment, T10: landing moment and T11: landing buffer moment], as calculated using the Xsens system. The data show the changes in the angles of the lower limb joints in different directions of motion. Lineation = adduction/abduction, dotted line = internal/external rotation, solid line = flexion/extension (dorsiflexion/ plantarflexion), black = hip, red = knee, blue = ankle. Graph d depicts the plantar pressure distribution at different characteristic times, and colour depth reflects the amount of pressure (the sum of the fore and the rear). Ground reaction force (GRF) is standardised by body weight (half of the sum of both sides of the feet, average of eight subjects)