Table 3 shows a significant (with a probability of type 1 error less than 0.05) increase in all indicators of linear and volumetric blood flow through the SMA after the 100-fold execution of a specific agnisara exercise, despite the statistical invariance of the resistance index (highlighted in gray in Table 3). Moreover, the amount of blood flowing through the SMA per minute increased with a probability close to 1.
The latter contrasts with the established data on a decrease in mesenteric blood flow in humans in response to various sympatho-adrenal activations, including physical activity. In other words, a performance of the special physical exercise agnisara 100 times should have reduced the blood flow through the superior mesenteric artery, like any other physical activity, which has been found in many studies [12, 13, 14, 15]. This is exactly what happened in subject ES when performing agnisara without uddiyana bandha. When we added the performance of uddiyana bandha before each propulsive movement of the anterior abdominal wall during agnisara, the volumetric flow of arterial blood along the SMA increased (see Table 2), which allows us to indicate a specific retraction of the anterior abdominal wall up to the diaphragm, called in yoga the uddiyana bandha, as a key element for the correct performance of agnisara.
In 2003, we described a shift in the autonomic tone towards the predominance of parasympathetic influences when performing uddiyana bandha . The same cholinergic reflex mediates an increase in blood flow to the SMA after a meal . Thus, the correct agnisara reproduces/imitates the vegetative support of the digestive process before meals, preparing the digestive tract to perform its function.
Interestingly, even at the initial stage of digestion, blood flow in the SMA also increased from as early as the first minute after a meal, that is, even before the chyme entered the intestine, or, in other words, preventively . We observed a similar more than 30% increase in blood flow in the SMA when performing the correct agnisara, of course, outside the meal, which allows us to prove the capacity of a correctly performed agnisara to activate gastrointestinal function through an increase in the SMA. Another coincidence with our data (see table 3) was that the increase in the mesenteric blood flow after a meal was mainly due to an increase in velocity and volume, the increase in the vessel diameter was less important .
Thus, an increase in blood flow to the SMA after repeating this yoga exercise 100 times can be seen as a sign of performing the exercise correctly. Then, our ultrasound experimental data can be seen as a confirmation of the ancient description of agnisara as the practice of "kindling the digestive fire" .