Hand grip, 2 group.

<p>Time course of global BOLD signals over four hand grip challenges (Grip effort; gray rectangles). <b>A:</b> Global BOLD signal in 37 OSA and 57 control subjects during the complete sequence. <b>B:</b> Average over four challenges of percent change in BOLD signals relative to baseline (group mean ± SE), with time-points of significant increase or decrease relative to baseline within-group, and time-points of between-group differences (RMANOVA, <i>p</i><0.05).