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According to a study entitled The Treatment of the Different Foodstuffs by the Stomach, which appeared in Volume 12 of the American Journal of Physiology:

The rate of peristalsis noted when bread and milk were fed was stated as 6 waves per minute; a new contraction would thus appear every ten seconds. A considerably slower rate of peristalsis (4 waves per minute) was noticed after feeding a fat-suggesting that there might be characteristic rates for the different foodstuffs. Observations at different intervals after feeding were therefore made on various animals which had been fed various kinds of foods and the following results secured:

Average rate/minute Variations in rate

Fats 5.0 waves 4.0 to 6.0 waves

Proteins 5.2 waves 4.8 to 5.8 waves

Carbohydrates 5.5 waves 5.0 to 6.0 waves

In general, then, it seems that the average rate of peristalsis is 5.0 to 5.5 waves per minute, with variations noted from between 4.0 and 6.0 waves per minute.

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