Location
UNLV Moyer Student Union 208
Start Date
16-4-2013 12:30 PM
End Date
16-4-2013 2:30 PM
Description
PURPOSE: The purpose of the study was to investigate the effects of SL perturbations on system COM forward velocity (vx) during walking gait. METHODS: Eight healthy adults (23.5±3.6 yrs; 1.72±0.18 m; 73.11±15.29 kg) performed 5 trials of preferred speed walking (PW) and running (PR) followed by 5 stride length perturbations based on percentages of leg length (LL: 60%, 80%, 100%, 120% and 140%). 3D kinematic analysis was completed using a 12-camera infrared motion capture system (Vicon MX T40-S, 200Hz). Data filtering and interpolation included a low pass, 4th order Butterworth filter (cutoff frequency 15Hz) and cubic (3rd order spline). Maximum and minimum system COMvx comparisons were made independently among stride conditions using one-way repeated measures ANOVA and Bonferroni post-hoc contrasts. Change in system COMvx across gait stride were evaluated using one-way repeated measures ANOVA and Bonferroni post-hoc contrasts (α=0.05). RESULTS: Differences in maximum COMvx were detected among stride conditions (F[1.847,59.105]=339.458, pdetected among stride conditions (F[2.118,65.666] =130.951, pdetected significantly greater ΔCOMvx at 140% LL, and significantly less ΔCOMvx at 60% LL (p≤.005). DISCUSSION: Differences in maximum COMvx were detected among stride conditions (F[1.847,59.105]=339.458, p
Keywords
Biomechanics; Gait in humans; Human locomotion; Walking
Disciplines
Biomechanics | Kinesiology
Language
English
Step Length Perturbations Alter Variations in Center of Mass Horizontal Velocity
UNLV Moyer Student Union 208
PURPOSE: The purpose of the study was to investigate the effects of SL perturbations on system COM forward velocity (vx) during walking gait. METHODS: Eight healthy adults (23.5±3.6 yrs; 1.72±0.18 m; 73.11±15.29 kg) performed 5 trials of preferred speed walking (PW) and running (PR) followed by 5 stride length perturbations based on percentages of leg length (LL: 60%, 80%, 100%, 120% and 140%). 3D kinematic analysis was completed using a 12-camera infrared motion capture system (Vicon MX T40-S, 200Hz). Data filtering and interpolation included a low pass, 4th order Butterworth filter (cutoff frequency 15Hz) and cubic (3rd order spline). Maximum and minimum system COMvx comparisons were made independently among stride conditions using one-way repeated measures ANOVA and Bonferroni post-hoc contrasts. Change in system COMvx across gait stride were evaluated using one-way repeated measures ANOVA and Bonferroni post-hoc contrasts (α=0.05). RESULTS: Differences in maximum COMvx were detected among stride conditions (F[1.847,59.105]=339.458, pdetected among stride conditions (F[2.118,65.666] =130.951, pdetected significantly greater ΔCOMvx at 140% LL, and significantly less ΔCOMvx at 60% LL (p≤.005). DISCUSSION: Differences in maximum COMvx were detected among stride conditions (F[1.847,59.105]=339.458, p
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