Fig. 1.
(a) Transient blood-pressure increase induced by arm-raising: time-courses of systolic, diastolic and mean arterial pressure (MAP), and correlation between systolic and diastolic pressure changes. (b) Corresponding effect on O2Hb and HHb signals measured in ‘shallow’ optode configuration, and correlation with MAP. Solid lines represent the average of arm-raised (redviolet) and no movement trials (bluegreen). Dashed lines denote 1 SD. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)