Fig. 3

Correlation between co-activation of trunk and gait speed in swing phase. The trunk part CI showed a significant positive partial correlation with gait speed (RA:ES, r = 0.467, p = 0.001; RA:MF, r = 0.322, p < 0.031). RA: Rectus abdominis, ES: Erector spinae, MF: Multifidus