Forces of Gait 2 1 Heel Strike 1

지면반력 Forces of Gait 2. 1. Heel Strike 1. 3. 4. Vertical 2. Weight Acceptance 3. Mid Stance Phase 4. Push Off Korea Institute of Sports Science Forwards/Backwards Sidewards 3

압력중심점(Center of Pressure) F Tz COP ax versus ay Gait COP coordinates (footprint) Korea Institute of Sports Science 4

Reaction Force 지면반력 Fz Normal Fy 힘 (N) 100% 체중 Fx Pathological Ø 수직 방향 힘(Vertical Ground Reaction Force : Fz) Ø 전·후 방향 힘(Anterio-Posterior Ground Reaction Force : Fy) Ø 좌·우 방향 힘(Mediolateral Ground Reaction Force : Fx) Korea Institute of Sports Science

Force plate applications – balance test (center of pressure) COP Top View COP versus time Korea Institute of Sports Science 7

Korea Institute of Sports Science

체육과학연구원 (Korea Institute of Sports Science) 근전위활동분석(EMG) 문영진

Motor Unit Recruitment and Frequency Firing Frequency of Motor Units Recruitment of Motor Units Korea Institute of Sports Science Superposed Surface Signal: Laurig 1983

EMG 실험 Korea Institute of Sports Science 12

EMG Signal Processing: Rectification Benefit: only positive values - mean, peak, area calculaton Korea Institute of Sports Science

EMG Signal Processing: Smoothing Root Mean Square at 300 ms Deleting non reproducible amplitude spikes Korea Institute of Sports Science

EMG Amplitude Parameters Peak [µV] Mean [µV] Area [µV/sec] Rectifie d. Signal Raw Signal Korea Institute of Sports Science

EMG Frequency Parameters Magnitude in v 2/Hertz Peak power Median frequency Mean frequency Total power Frequency in Hertz Korea Institute of Sports Science

균형 자세 Application Spontaneous Standing Korea Institute of Sports Science Corrected Standing

Korea Institute of Sports Science

EMG - Isokinetics Kinesiological Measurement Setup EMG-Isokinetics EMG Torque Angle Isokineticanalysis Multi-channel EMG amplifier EMG -Input Isokineticmotorunit EMGelectrodes EMG-Isokinetic. Interface-cable Korea Institute of Sports Science Torque -Output

Healthy (trained) side: Knee patient performing 20 knee extension-flexion cycles at 180°/sec. EMG/Torque quotient on Ch. 5 -8 Korea Institute of Sports Science Injured side