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Table 2 Correlation coefficients (Pearson) between heteronymous modulations produced by FN stimulation and co-activation indexes during gait

From: Changes in activation timing of knee and ankle extensors during gait are related to changes in heteronymous spinal pathways after stroke

Group Modulation Co-activation indexes  
  Time window (ms after ZCD) PAIVL-Sol PAIVL-GL PAIRF-Sol PAIRF-GL CAIVL/at Solmax CAISol/at VLmax CAIRF/at GLmax CAIGL/at RFmax
Stroke (0-6) -0.73** -0.62* -0.41 -0.34 0.57* -0.32 -0.44 -0.47
  (12-24) -0.65* -0.45 -0.24 -0.09 -0.43 -0.23 -0.22 -0.24
  (24-36) -0.550 -0.62* -0.27 -0.35 -0.49 -0.17 -0.26 -0.38
  (36-48) -0.21 -0.40 -0.14 -0.32 -0.29 -0.01 -0.08 -0.22
Control (0-6) -0.40 -0.55 -0.29 -0.24 -0.14 -0.33 -0.16 -0.29
  (12-24) -0.04 -0.33 -0.45 -0.55 -0.10 -0.28 -0.14 -0.25
  (24-36) -0.24 -0.11 -0.28 --0.14- -0.05 -0.33 -0.16 -0.16
  (36-48) -0.10 -0.11 -0.12 -0.03 -0.10 -0.11 -0.13 -0.11
  1. PAI: peak activation interval; CAI: co-activation amplitude index; Sol: soleus; GL: gastrocnemius lateralis; VL: vastus lateralis and RF: rectus femoris; ZCD: zero central delay; Significant correlations are in bold; *p ≤ 0.05; **p ≤ 0.01.