Date:___10/29/14____________ Provide a copy of your completed data worksheets.
Table 1. Changes during the Dive Response
15 Seconds into the Dive
End of the Dive
Table 2. Changes during Breath-holding
15 Seconds into Breath-hold
30 Seconds after Breath-hold
Table 3. Changes in Peripheral Circulation
Change in Leg Blood Volume
Effects of the Dive Response on Heart Rate and Pulse Amplitude In the space below, insert a bar graph showing the heart rate and pulse amplitude during rest, 15 seconds into the dive, just before the end of the dive, and 30 seconds after the end of the dive.
Effects of Breath-holding on Heart Rate and Pulse Amplitude In the space below, insert a bar graph showing the heart rate and pulse amplitude during rest, 15 seconds into the breath-hold, just before the end of the breath-hold, and 30 seconds after the end of the breath-hold.
Changes in Peripheral Circulation
In the space below, insert a bar graph showing the change in peripheral circulation during rest, during the dive, and during the breath-hold.
Answer the following questions in complete sentences.
1. Did the amplitude of your pulse beat change during a dive and/or during a breath-hold?
During the dive the amplitude increased from .0166 to .02312 at 15 seconds into dive suggesting an increase in stroke volume due to decreased heart rate. At the end of the dive the amplitude decreased to .015 and increased after the dive to .054. During the breath holding the amplitude increased at the highest heart rate at rest had the lowest amplitude. While the heart rate decreased over the breath hold the amplitude increased slightly.
2. Did your leg blood volume change during a dive and/or during a breath-hold? What do you results suggest about the rate of blood flow to your extremities during diving?
We are measuring the amount of venous blood returning to the body after we release the cuff, which was blocking the venous return back to the body. At rest the leg blood volume was .74. The blood volume in the leg during the dive was the least at .31, and while holding his breath it was closer to at rest at .61. During a dive the blood flow to the extremities is decreased so that more blood is in the torso conserving heat, and is important during a dive.
3. Did your heart rate change during a dive and/or during a breath-hold?
The heart rate changed at both events but lowered more during the dive then breath holding. Our volunteer had to do the dive twice so resting heart rate was fast at rest. 15 seconds into the dive it drops 31 BPM down to 75 BPM, and at the end of the dive dropped an additional 22 beats to 52 BPM. After the dive while recovering it went back up 20 beats to 73 BPM. During the breath hold at rest his BPM was 90 then 15 seconds into the hold it dropped 22 beats to 68 BPM. At the end of the hold it dropped 2 beats down to 66 BMP, and while recovering it increased by 4 beats to 70 BPM.
4. What was the time course of the dive response? How long did it take the response to occur? How quickly did your heart rate return to normal after a dive?
It took about 15 seconds for the dive response to occur. It took longer then the recorded 30 seconds for the heart rate to return to normal after the dive.
5. The dive response is often considered to be adaptive. Do you agree? Explain why you chose your answer.
Yes I agree the dive response is adaptive because we observed the peripheral vasoconstriction where there was less blood in the legs during a dive and also the...
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