Table 2.

Mean difference and ratio between normalized stiffnesses of the two tasks for the single force levels.

	10% MVC	20% MVC	30% MVC	40% MVC	50% MVC
$⟨{\mathit{\text{k}}}_{\mathit{\text{task}}{\text{1}}_i}^{\ast }⟩$	8.7%	18%	22%	35%	40%
$⟨{\mathit{\text{k}}}_{\mathit{\text{task}}{\text{2}}_i}^{\ast }⟩$	23%	32%	42%	56%	66%
$\mathit{\text{s}}\left({\mathit{\text{k}}}_{\mathit{\text{task}}{\text{1}}_i}^{\ast }\right)$	±5.7%	±7.7%	±8.7%	±16%	±15%
$\mathit{\text{s}}\left({\mathit{\text{k}}}_{\mathit{\text{task}}{\text{2}}_i}^{\ast }\right)$	±12%	±14%	±16%	±17%	±16%
$⟨{\mathit{\text{k}}}_{{\mathit{task}\text{2}}_i}^{\ast }-{\mathit{\text{k}}}_{{\mathit{task}\text{1}}_i}^{\ast }⟩$	15%	14%	21%	21%	26%
$⟨{\mathit{\text{k}}}_{\mathit{\text{task}}{\text{2}}_i}^{\ast }/{\mathit{\text{k}}}_{\mathit{\text{task}}{\text{1}}_i}^{\ast }⟩$	5.3	2.2	2.2	1.9	1.9

The mean values in stiffness $⟨{\mathit{\text{k}}}_{\mathit{\text{task}}{\text{1}}_{\mathit{\text{i}}}}^{\ast }⟩$ and $⟨{\mathit{\text{k}}}_{\mathit{\text{task}}{\text{2}}_{\mathit{\text{i}}}}^{\ast }⟩$ of the two tasks and their SDs $\mathit{\text{s}}\left({\mathit{\text{k}}}_{\mathit{\text{task}}{\text{1}}_{\text{i}}}^{\ast }\right)$ and $\mathit{\text{s}}\left({\mathit{\text{k}}}_{\mathit{\text{task}}{\text{2}}_{\mathit{\text{i}}}}^{\ast }\right)$ are given. In addition, mean difference in normalized stiffness $⟨{\mathit{\text{k}}}_{\mathit{\text{task}}{\text{2}}_{\mathit{\text{i}}}}^{\ast }-{\mathit{\text{k}}}_{\mathit{\text{task}}{\text{1}}_{\mathit{\text{i}}}}^{\ast }⟩$ and their ratio $⟨{\mathit{\text{k}}}_{\mathit{\text{task}}{\text{2}}_{\mathit{\text{i}}}}^{\ast }/{\mathit{\text{k}}}_{\mathit{\text{task}}{\text{1}}_{\mathit{\text{i}}}}^{\ast }⟩$ for all force levels in percent of MVC over all subjects are listed. Note that the index i denotes the mean over subjects.