Make sure your her head down long ca seconds should be long enough 2 The timer s

Question

Make sure your her head down long ca seconds should be long enough 2 The timer should tap the subject on the back every 10 so the weeconds aloud 10-sec to hear), several at 40 to indicate they can stop holding their from 10 30 seeonds during the breath-hold and then agai breath. The Pulse-taki for 20 seconds start ing about 10 seconds after the subject starts breath The test should Chowever they feel they should breathe) aner releasing their at the end just breathe normally 3. Record these data in Table Part The Diving Rene I. Fill a large bowl or basin with water. Place several ice cubes in the bowl. Record the temperature ofthc water with the temperature probe. Add ice cubes until the temperature of the water is approximately 10°C. ld bowl of water should be placed in front the subject. Record the temperature water 2. Instruct the test subject to normally. their pulse for 20 seconds. As soon as the timer has written down the pulse, they should cue the subject to follow the same protocol as above deep breath then put face down), only this time they should submerge their face to the temples cold water. in the 3. The timer should (as before), tap on their shoulder every 10 seconds, time out loud. pulsc saying the The taker should measure the pulse from the 10-30 second time-interval and then measure it again starting 5-10 seconds after the subject starts breathing again. 4. Calculate the percent change in heart rate during the breath-holding and the simulated dive Record this data in Table DATA AND CALCULATIONS Water Temperature (°C): Table 1: Heart Rate (HR) measurement before and during breath holding in air and in cold water subject holding breath in air HR r minute holding breath in cold water change start 22.56 7 2.77% Percent change in heart rate can be calculated as follows: ((HRduring HRbefore) HRbefore) x 100

Explanation / Answer

2) The heart rate of the test subject decreased at first and then it increased. When the subject is at rest, breath holding will relax body muscles. Relaxed muscles no longer need oxygen and carbondioxide concentration in blood is also low. The blood flow to heart will decrease and this results in decreased heart rate.

After holding breath for some time, oxygen levels in blood will come low and the carbondioxide concentration will be increased. There is an increased urge to breathe. The venous return to the heart is increased and heart rate also rises.

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