Biopac Student Lab Lesson 7: Blood Pressure, ECG & Pulse

ECG & Pulse


Mechanical Action of the Heart, Peripheral Pressure Pulse,

Plethysmography, and blood pressure




Studentís Name: _______________________________________

Lab Section: __________________________________________

Date. ________________________________________________


I. Data and Calculations

Subject Profile

Name _____________________________ Height ________________________

Age ______________________________ Weight ________________________

Gender: Male or Female

Name:_____________________________ Sec: ______________


A. Comparison of ECG with Pulse Plethysmogram (Segments 1-3) Complete Table 7.1

with data from three cycles from each segment and calculate the Means.

Table 7.1

B. Calculation of Pulse Speed


Distance between Subjectís sternum and shoulder? ________________ cm


Distance between Subjectís shoulder and fingertip? ________________ cm

Total distance? ________________ cm


Segment 1 Data (use I-beam to select data from Segment 1 of the recording)

Time between R-wave and Pulse peak? ______________________secs

Speed? cm/sec


Segment 2 Data (use I-beam to select data from Segment 2 of the recording)

Time between R-wave and Pulse peak? ______________________secs

Speed? cm/sec



II. Questions

A. Referring to data in table 7.1, are the values of heart rate and pulse rate similar for

each condition? Yes/No Explain why the values might differ or be similar.



B. How does the ratio between the durations of ventricular systole and ventricular

diastole change from resting to exercise state? (Table 7.2)


C. How does the amplitude of QRS and relative pulse amplitude change from resting to

exercise, to having hand in cold water? (Table 7.2)


D. How is blood pressure affected by exercise and having hand in cold water?


E. Describe one mechanism that causes changes in blood volume to your fingertip.



F. Referring to data from section C of this report, how would you explain the difference

in speed, if any?



G. Which components of the cardiac cycle (atrial systole and diastole, ventricular

systole and diastole) are discernible in the pulse tracing?



H. Would you expect the calculated pulse wave velocities of other students to be very

close if not the same as yours? Why or why not?

End of Lesson 7 Data Report