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https://pdf.sciencedirectassets.com/277338/1-s2.0-S1016319012X00028/1-s2.0-S1016319011001285/main.pdf?X-Amz-Security-Token=IQoJb3JpZ2luX2VjEDMaCXVzLWVhc3QtMSJHMEUCIQDnh%2Fxx%2FbsKidJbLpCr5JDAV1YjcjwmmgPx6cKbLSv77gIgSvXHJ1P222jZlhRfWbVYh5rABy3gWGYBwrQGPJonJFkqgwQI2%2F%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FARAEGgwwNTkwMDM1NDY4NjUiDD1Jq8CQoCll1e0AsCrXAwPxeYsqSmsA9fsbyOWjWmhBz2nkVP8TJD2XJJn7ZnAR9lu%2BnKT3N83ArTN%2FWeyFYseJVq%2FNphYKk3RyFwOqm%2FI0mDmpF7%2BVjnuHtraNsVgiS0pJhLmAnXRHwqsZEoHsUFOVasNR0QbFNCfsW%2Bu47ODU8XCZju3Jtc0ShuY2TuaLBXI4Y1cKmFpV7aiJpzsBHXUr%2FpXCCesX2bvXhfpMPD4kaJAVZYT33sQ0etBXeTfsoIGYRLJlSOdGrwgrIvl%2BqDcIMEfeGVG%2BLIiJhXeBCXb0IUSzp5mD4ssusACKIK2sI1PvH5GJYh3GuGMjz3VbD8pdqZ5cx5BClype0ZAfuXYkIJKAX3z1YaUU1scOnINKAR0YDn%2FXopyC3eOjmoD%2FCbwiSwKMhikz0YGOkE6aXLNwpJYL9i5SBDwSzrAF35N5XvjyGKSGB2wEfmtZTC1%2FHHe3zPilvZXrRG6fhI7h0YQd%2FZk5ls1yUtcQpLiWt2wyNZWFnmCng5Af12GBiT3A%2BiQGi9k9kEH1cOAQU7q89sd7kKH7biErd9LUgyerJzihQWMihd59NeQ6MqpAvK2beiXGaJGVKMHzSUzb6v9w9nvwZu3WDdFAEdvG58%2FN0N1sWvkZEkq99zDI96qMBjqlATueFhNnC0LlfkWdaPS1h8hPq08wfbk9DoWPaMVGDDToXyYzdwGVnVxjFMQsmexKjfLJ75ngm4IgU3akKPrHiCY5o1T50MOvTRpFCmTiL57YHFrBJS05oJF7BHAYs1QkNjpSljnbam1jrEhaHCENYofCDSSKDtlxEvYCUxfrtal9HjWjP3dxzzEZH1K%2Bb55YHxtzBc2k2UGMyKYfSJmj%2ByLvph3JNw%3D%3D&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Date=20211109T192659Z&X-Amz-SignedHeaders=host&X-Amz-Expires=300&X-Amz-Credential=ASIAQ3PHCVTYRYQCFSED%2F20211109%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Signature=c8127c28330ca55b91f79d20e4b00d01a5102a171c586fd40b50815981cdbce8&hash=b0e412aaabea256b00725af52a3e3d924dc1d002f09bb44bf6db6c3dd57f4883&host=68042c943591013ac2b2430a89b270f6af2c76d8dfd086a07176afe7c76c2c61&pii=S1016319011001285&tid=spdf-267ce1cd-bff1-4c6a-bc85-e73716a406b2&sid=b276c301337b104d010bf5c8d3ef88f04bf0gxrqa&type=client

Vagal Maneuvers modify the autonomic nervous system, and can affect heart rate through a reciprocal increase in parasympathetic outflow and reduction in sympathetic tone

https://www.ncbi.nlm.nih.gov/books/NBK551575/?report=reader#_NBK551575_pubdet_

Vagal maneuvers describe a set of techniques that serve to increase vagal parasympathetic tone.

Vagus stimulation reduces the speed and frequency of electrical stimulation of the heart, which can serve to slow or terminate certain dysrhythmias.The right vagus nerve stimulates the sinoatrial (SA) node, located in the right atrium of the heart. This area is often referred to as the "pacemaker". The left vagus nerve influences the atrioventricular (AV) node, also located in the right atrium of the heart. Stimulation in this area slows the conduction between the atria and the ventricles.

https://journals.physiology.org/doi/full/10.1152/japplphysiol.90991.2008
diving reflex reflex is thought to be mediated by both baroreceptor and chemoreceptor stimulation. Apnea related to the cessation of breathing and subsequent stimulation of the vagus nerve causes peripheral vasoconstriction and bradycardia, as a physiologic reflex to conserve oxygen. https://zaf.biol.pmf.unizg.hr/ecophys/09%20Ronjenje%2002.pdf

sensory receptors in certain areas of the face innervated by the trigeminal nerve are thought to also play a part in relaying this information to the brain and may contribute to the autonomic response.