Figure 6. Minimum thumb adduction force during the dynamic shortening phase.

The minimum forces during the dynamic shortening phase (F_Shortening) were normalized relative to the corresponding isometric reference forces and pooled for each shortening condition and across all subjects. The minimum forces during the dynamic shortening phase were found to decrease with increasing magnitudes (A) and increasing speeds (B) of shortening (*P < 0.05). The minimum forces during shortening differed between the electrically induced (continuous line) and the voluntary contractions (dotted line) (†P < 0.05). Means (± S.E.M.) are presented.