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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 |
