protein consumed before a carbohydrate meal can stimulate insulin and incretin hormone secretion and slow gastric emptying, leading to marked reduction in postprandial glycemia in type 2 diabetes.

The following factors affect gastric emptying

1. Particle size

2. Osmolarity

3. Presence/absence of lipids

4. Degree of distension of the stomach and small intestine

As Colin Musara wrote, the emptying will depend in part on the distension of the stomach. If your amino acid are concentrated in few ml, they will directly reach the intestine as the cardia will be largely opened after fasting. If the volume is higher, the cardia will close and the delay will increase before reaching intestine.

The emptying can be fast after fasting (cardia opened (several mm to 1 cm)) until distension, protein or lipid content, osmolarity induce a closure of the cardia (around 2mm).

During fasting, strong stomach contractions occured every 2 hours.

If volume increases, duration of digestion increases

If protein content increases, duration of digestion increases

If osmolarity increases or decreases below isotonicity, duration of digestion increases.

I have no reference in mind but works exist.

Okay many thanks.

Just to be clear

After fasting I ingest amino acids, they would travel relative quickly through the stomach right? But how fast? Furthermore these AA's can be used in the gut for creation of enzymes needed or even energy it self. So how to manage that.

If I eat a meal and afterwards take amino acids supplement it will not travel quick because of the full stomach?

For me it is important to know this because with sport nutrition I feel the stomach might be misunderstand sometimes.

If you might one day find some reference it would be welcomed.

Many thanks again