Fig. 6.

In a separate group of subjects (n = 14), forearm MBV responses were examined 60 s after application of −10, −20, −30, −40, and −50 mmHg tank pressure. At 60 s under negative pressure, MBV was below baseline levels for all levels of suction (P < 0.05). A greater vasoconstriction response (ΔMBV) was observed with higher negative pressures (−30 and −40 mmHg) compared with lowest negative pressure (−10 mmHg). Baseline, baseline levels at ambient pressure where Δ = 0. *Significantly different from −10 mmHg.