Fig. 2. Effects of position, time, and table inclination on mean arterial blood pressure as percentage of baseline supine; HT = horizontal table; RT = reverse Trendelenburg (4 degrees); prone 0 is immediately prone; prone 1 through prone 5 represent hourly readings through the fifth hour; post 0 represents immediate return to supine; post 30 represents head of stretcher elevated at 30 degrees for 30 min; n = 10 except for post 0 and post 30, where n = 8.