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Table 4 Relationships between isometric quadriceps muscle strength and co-activation identified using Pearson's correlation co-efficients (r) for each group (* p ≤ 0.05; ** p ≤ 0.01)

From: Co-activation: its association with weakness and specific neurological pathology

Diagnostic group

Extra-pyramidal

UMN lesions

LMN (sensory intact)

LMN (sensory loss)

Muscle disease

Isometric co-activation

r = -0.09

r = -0.3

r = -0.4

r = -0.1

r = -0.7 **

Co-activation during STS

r = -0.06

r = -0.7 *

r = 0.06

r = 0.4

r = -0.4