Figure 1.

(A) Experimental setup for wrist flexion MVCs. In this photo, the force transducer is positioned above the palm and aligned along the distal portion of the metacarpal bones. The forearm could be pronated to perform wrist extension MVCs. The left (non-dominant arm) was rested upon the table, palm up, to prevent any assistance during MVC trials. The same setup was utilized for the fatigue-inducing trial where participants exerted a sustained MVC until they reached the 25% cut-off. The handgrip dynamometer is also shown attached to the aluminum framing in close proximity to the force transducer. (B) Example of handgrip force displayed to participants. The solid horizontal line represented 10% of the individual’s maximal handgrip force, while the top and lower dashed lines represented 11 and 9%, respectively. Participants were instructed to begin gripping when the trace reached the first vertical line and would be stimulated 1.5 s later at the second vertical line.