The purpose of this was to investigate the dive response when a person’s face is immerged in water. When their face is submerged in water, it triggers a mammalian dive response. This response refers “to the set of physiological changes occurring when air-breathing mammals hold their breath and submerged themselves under water.” (Evans, 2013) The two physiological metrics we were able to monitor in our dive simulation experiments are heart rate and blood pressure. The physiological change in a dive response called bradycardia. This is important because upon facial contact to water, the heart rate slows down and the heart requires action potential. Therefore when the heart rate decreases which lessens the need for energy and leaves more for other organs to use. In addition, during a dive the "arterial blood pressure is not maintain and can dramatically increase to values as high as 280/200 mmHg (systolic/diastolic)" (Foster & Sheel, 2005), this is due to blood supply being redirected to other organs. Unlike humans, diving animals have an adaptation that stops blood traveling to non-essential organs. This is called vasoconstriction, which is the narrowing of blood vessels. When blood vessels constrict, blood flow slows down or is blocked. I hypothesized that during a stimulated dive the heart rate of the volunteer will decrease and his blood pressure would increase.
This lab was performed at CSU East Bay Campus. We obtained both heart rate and blood pressure data from our volunteer. We will collect these physiological metrics twice for each of the five different conditions. These conditions are resting, control, face submerged in room temperature water, face submerged in cold water, and face submerged in warm water. To monitor and recorded our volunteers heart rate by using a program called PowerLab and fingertip pulse recorder. His blood pressure was monitored by a blood pressure machine. The first set of data collected was when the...