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)

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

Busse et al. Journal of NeuroEngineering and Rehabilitation 2006 3:26   doi:10.1186/1743-0003-3-26