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Table 3 Comparison of pressure outputs for demonstration trials

From: Visceral pressure stimulator for exploring hollow organ pain: a pilot study

Trial #

Target pressure (mmHg)

Analog Sphyg. (mmHg)

VPS (mean ± SD) (mmHg)

Analog-to-digital converter (mean ± SD) (mmHg)

MatLab avg pressure from VPS signal

MatLab VMR signal (V * s)

1

30

31 ± 3

32.92 ± 0.53

32.15 ± 0.70

32.83

1.33

2

30

31 ± 3

32.98 ± 0.57

32.16 ± 0.78

32.95

1.59

3

30

32 ± 3

32.34 ± 0.84

31.17 ± 1.16

32.33

1.22

  1. Data show pressure and calculated VMR for 3 trials (20 s of actual stimulus; total trial length 40 s; intertrial interval of 1 min) between the VPS, the inline analog-to-digital pressure converter and a commercial analog sphygmometer. The Matlab avg pressure was calculated from VPS signal and the Matlab VMR signal was calculated from the normalized EMG signal