Administration of an amino acid mixture consisting of 15 amino acids, (4.1g L-alanine, 2.4g glycine, 2.4g L-histidine, 6.0g L-isoleucine, 10.1g L-leucine, 6.7g L-lysine, 4.3g L-phenylalanine, 9.2g L-proline, 5.2g L-serine, 4.3g L-threonine, 5.2g L-tyrosine, 6.7g L-valine, 3.7g L-argine, 2.0g L-cysteine, 3.0g L-methionine) lacking tryptophan to investigate the effect of tryptophan depletion on esophageal sensitivity

Administration of an amino acid mixture consisting of 15 amino acids, (4.1g L-alanine, 2.4g glycine, 2.4g L-histidine, 6.0g L-isoleucine, 10.1g L-leucine, 6.7g L-lysine, 4.3g L-phenylalanine, 9.2g L-proline, 5.2g L-serine, 4.3g L-threonine, 5.2g L-tyrosine, 6.7g L-valine, 3.7g L-argine, 2.0g L-cysteine, 3.0g L-methionine and 3.0g L-trypyophan). Since this amino-acid mixture contains tryptophan it is used as the placebo arm of this cross-over study

Esophageal Sensitivity

an amino-acid mixture will be administered without tryptophan (active comparator). After an incubation period of 5 hours esophageal sensitivity will be assessed by multimodal stimulation to evaluate the effect of depleted tryptophan levels on esophageal sensitivity

Acute tryptophan depletion

an amino-acid mixture with tryptophan (placebo mixture) will be administered. After an incubation period of 5 hours esophageal sensitivity will be assessed by multimodal stimulation

Placebo

The multimodal esophageal probe allows to perform 4 types of stimulations in the esophagus (thermal, mechanical, electrical and chemical stimulation). These 4 modalities will be evaluated to assess esophageal sensitivity.

Multimodal stimulation probe

Targid, KU Leuven

The Effect of Acute Tryptophan Depletion (ATD) on Esophageal Sensitivity in Healthy Volunteers

The Effect of Acute Tryptophan Depletion (ATD) on Esophageal Sensitivity in Healthy Volunteers: a Randomized, Single-blind, Placebo-controlled Study

Investigation of the effect of acute tryptophan depletion on esophageal sensitivity to multimodal stimulation in a group of healthy volunteers. This will be assessed by comparing the Temperature values (°C) of the stimulation tests between the placebo and acute tryptophan depletion condition to see if tryptophan depletion affects the sensitivity to increasing temperature.

Investigation of the effect of acute tryptophan depletion on esophageal sensitivity to multimodal stimulation in a group of healthy volunteers. This will be assessed by comparing the balloon volumes (volume in ml) of the stimulation tests between the placebo and acute tryptophan depletion condition to see if tryptophan depletion affects the sensitivity to increasing balloon volume.

Investigation of the effect of acute tryptophan depletion on esophageal sensitivity to multimodal stimulation in a group of healthy volunteers. This will be assessed by comparing the tolerated intensity of the electrical pulses (mA) of the stimulation tests between the placebo and acute tryptophan depletion condition to see if tryptophan depletion affects the sensitivity to increasing electrical pulses.

Investigation of the effect of acute tryptophan depletion on esophageal sensitivity to multimodal stimulation in a group of healthy volunteers. This will be assessed by comparing the volume of infused acid (ml) of the stimulation tests between the placebo and acute tryptophan depletion condition to see if tryptophan depletion affects the sensitivity to acid infusion.

l cysteine/nausea

The Effect of Acute Tryptophan Depletion (ATD) on Esophageal Sensitivity in Healthy Volunteers

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