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Table 1 System identification parameters to be estimated

From: System identification: a feasible, reliable and valid way to quantify upper limb motor impairments

Parameter

Unit

Parameter

Unit

Inertia

   

\(I\)

Nm·s2/rad

  

Viscosity

 

Elasticity

 

\({b}_{100,DNI}\)

Nm·s/rad

\({k}_{100,DNI}\)

Nm/rad

\({b}_{75,DNI}\)

Nm·s/rad

\({k}_{75,DNI}\)

Nm/rad

\({b}_{50,DNI}\)

Nm·s/rad

\({k}_{50,DNI}\)

Nm/rad

\({b}_{25,DNI}\)

Nm·s/rad

\({k}_{25,DNI}\)

Nm/rad

\({b}_{0,DNI}\)

Nm·s/rad

\({k}_{0,DNI}\)

Nm/rad

\({b}_{100,res}\)

Nm·s/rad

\({k}_{100,res}\)

Nm/rad

\({b}_{0,res}\)

Nm·s/rad

\({k}_{0,res}\)

Nm/rad

  1. The subscripts indicate the percentage of arm weight that is supported (e.g. 100% is full arm weight support) and the task condition (DNI: ‘do not intervene’; res: resist)