Force variability is mostly not motor noise: Theoretical implications for motor control
Fig 8
Viscoelastic properties of the contractile element damps high-frequency oscillations associated with discharge rate of motor units.
Power spectra of output force at different synaptic input levels (5%, 20%, 40% and 70%) for our new model without a series-elastic element (SSE) in red and with SEE and blue. Note that addition of SEE substantially reduces power at frequencies >5 Hz (shaded areas).