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1. Wetting the Face- When a diver goes in the water their face is an area that greatly affects the rest of the body. While the actual water on the face may not be the reason a person's pulse may slow down it still is a possibility. Many believe the temperature change in the water is what affects the pulse rate more than wetting a person's face.

2. Cold Receptors- When the main cold receptors on the body are in a new environment they react quickly. Most of the body's cold receptors are right around the nose and mouth. When the receptors sense a change they send a message to the brain which sends a message to the heart to slow down.

3. Circulation to the Limbs- When a person's cold receptors have realized that the body in a colder environment circulation is kept to the core of the body. Since the internal organs must survive the arms and legs become not as important. Therefore, circulation to these areas is lessened meaning that a pulse at the wrist or ankle will be hard to feel.

4. Anticipation- Many people become quite nervous at the thought of diving. Simply breathing underwater is frightening to many. This fear may cause the heart to speed up circulation and the person's pulse to escalate.

5. Physical Activity- When a person dives they exert a large amount of energy and their pulse will become higher. It is quite hard to move underwater with all the equipment scuba divers must have on. This causes the diver to have an escalated pulse rate.

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