Fig. 1: Hemodynamic responses progressively increase with rising levels of seated lower body negative pressure (LBNP).
From: Increasing seated reaction forces with lower body negative pressure

Both mean arterial pressure (MAP) and heart rate (HR) increased with increasing LBNP; error bars represent standard deviation. Statistical significance was observed starting at –20 mmHg for MAP and –10 mmHg for HR (P < 0.05).