This adaptation allows the animal to only send oxygenated blood to only vital body parts. This reflex is due to the vasoconstriction of brickyard, panel, and peripheral (Gook’s r). In the paper by Gook’s;r et a’, it is mentioned that all humans have this response. In order to trigger this response, a cold stimulus such as immersion of the face in water is needed. Nervous receptors on the face cause a laryngeal commemorate, this and panel trigger the dive reflex in humans (Sotto). Gasworks paper goes over the experiment used to measure whether or not humans have this reflex.
And in his paper, infants were used o test this hypothesis on whether or not humans have this response. It was observed in the article that humans lose slowly lose this ability as they age. Also, using young lambs as test subjects in another study, they were able to observe that cardiovascular activities were the same. Brickyard reactions seen in both lambs and infants show that mammals do have a dive response (Sotto). To test this reflex in humans, subjects were asked to immerse their face in a tub of water and data was collected Materials and Methods: This experiment was conducted in the Coastal Science Center using fourteen students.
Small tuber-ware containers were filled with water to conduct the tests. Some containers held room temperature water, while others contained cold water. Initial resting heart rate was taken while sitting. The subject then bent over to immerse their face into the room temperature water. While immersed, heart rate was monitored to record any changes. This procedure was then repeated four times before switching over to cold water to observe any differences in the amount of time someone can withstand being immersed compared to being in open air while holding their breath.