Blood Pressure Lab

7/24/2019 Blood Pressure Lab

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Blood Pressure, Heart Rate, and Pulse

Each time the ventricles contract, about 70 mL or more of blood is forced into the arteries. Every timethis happens, the pressure is raised throughout the arterial system. This arterial pressure, however, falls

as the blood is pushed through the capillaries. Then a new ventricular contraction repressurizes the

system. This rhythmic change in arterial pressure is called the pulse ad can be felt almost anywhere anartery can be squeezed by a finger.

f you e!ercise vigorously, your heartbeat rate, or pulse rate, increases. The amount that it increases

depends on how fit you are. " strong heart can pump blood more efficiently than a wea# one. Therefore

the pulse rate of a physically fit person will not increase as much with e!ercise as will that of aphysically unfit person. $ne measure of fitness is the %eart &erformance 'core (%&').

*lood pressure and heart rate can be affected by the activity our body is performing. n this lab we will

investigate the effect of posture and e!ercise on blood pressure and heart rate.

Materials

stethoscopesphygmomanometer

stop watch

Procedure

+or all steps, record all data in a table format. "lso, collect data for each step for each partner.

Part A - Pulse

ote- +or all pulse rate measurements, ta#e the radial pulse for 0 s/ then multiply by to get the pulse

rate (in beats per minute).

1. 2esting heart rate can be used as an indicator of cardiovascular fitness. The best time to ta#e restingheart rate is while sitting quietly after a period of inactivity. 3etermine your resting heart rate and record

it. 4a#e sure you can find the radial pulse in both arms and in those of your partner.

. 5se one hand to find the radial pulse and, at the same time, use the other hand to find the carotid

pulse. 6oncentrate carefully, do they occur at the same time

. 5sing a stethoscope, determine whether the pulse corresponds to the first or second heart sound.

Part B - Blood Pressure and Heart rate

8. To improve the accuracy of our data, the e!ercise you should do is running on the spot for theprescribed time. To see any meaningful results, it is very important that you measure heart rate and

blood pressure e!actly when you are supposed to. 4a#e sure that you and your partner(s) are organizedso that you can get the results quic#ly. 4easure and record your heart rate and blood pressure for each of

the following conditions-

(i) lying

(ii) standing(iii) after 90 s of e!ercise

(iv) after 90 s of rest after e!ercise


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:. "dd your data to the class pool so that averages for the class can be calculated.

Part C - Heart Performance Score

%&' ;eneral +itness Level

00


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1. *egin by having the sub?ect practice inhaling moderately and holding hisAher breath for : s. The

recorder should time this breath


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1. a) Each ventricle pumps out 70 mL of blood with every beat. %ow many beats are necessary to pump

8. L of blood through the heartb) %ow long would this ta#e at your resting heartbeat rate

c) %ow long would this ta#e when your body is hard at e!ercise

1. 2esearch the topic of bradycardia (or brachycardia) as it relates to the diving response in mammals.

Bhat are the advantages in reducing the heart rate while under water 3escribe other physiologicaladaptations related to bradycardia.

Blood Pressure Lab

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