Homework answers / question archive / PHGY 215: Integrated Lab Report Question and Data Set A participant is asked to run on a treadmill for ten minutes at a constant speed in order to assess changes in cardiovascular parameters

PHGY 215: Integrated Lab Report Question and Data Set A participant is asked to run on a treadmill for ten minutes at a constant speed in order to assess changes in cardiovascular parameters

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PHGY 215: Integrated Lab Report

Question and Data Set

A participant is asked to run on a treadmill for ten minutes at a constant speed in order to assess changes in cardiovascular parameters. Starting immediately prior to running and every minute thereafter, the participant’s stroke volume, systolic blood pressure, and diastolic blood pressure are recorded. Six second ECG samples are also recorded prior to exercise (at rest) and every minute thereafter.

Consider the following results before answering the provided questions. Rememberto follow the specifications outlined in the assignment description.

Cardiovascular Data from Participant:

Time (min) Stroke Volume

(ml)

Systolic Blood Pressure

(mmHg)

Diastolic Blood Pressure

(mmHg)

0 (Rest) 70 120 80

1 85 138 80

2 110 150 80

3 115 156 80

4 119 159 80

5 120 160 80

6 120 160 80

7 120 160 80

8 120 160 80

9 120 160 80

10 120 160 80

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ECG Traces of Participant:

At Rest:

1 Minute:

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2 Minutes:

3 Minutes:

4 Minutes:

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Note: The ECG traces recorded at the 5 minute mark and onwards are not shown as

they are nearly identical to the trace recorded at the 4 minute mark.

Integrated Lab Report Questions

1. Graph the changes in stroke volume, heart rate, systolic blood pressure, and

diastolic blood pressure from Rest to 10 min. Include all relevant labels and units.

Accompany each graph with a brief figure caption outlining what data are illustrated

by the graph and the main trend contained in the graph. Be consistent in your graph

formatting.

2. Calculate and graph the participant’s cardiac output throughout the experiment.

Please show all calculation work.

i) Why does the body need an increased cardiac output?

ii) What are the physiological responses within the participant to increase the

cardiac output? Include cardiac, neural, and vascular changes.

iii) One of the benefits of exercise is increased cardiac contractile strength. If the

participant performed regular exercise training, what changes might you

expect to see in how their cardiac output response to exercise is achieved?

3. i) Calculate the participant’s mean arterial pressure (MAP) and total peripheral

resistance (TPR) for before and after 10 minutes of exercise. Please show all

calculation work.

ii) What are the physiological responses that cause a change in TPR?

iii) If the participant was given a vasodilator medication that increased the radius

of all blood vessels by 25%, by what factor would flow rate through a single

vessel change in response to the medication if all other variables were held

constant?

4. Is the change in systolic blood pressure the same across all types of vessels AND

organs? If it varies then explain why? What is the significance of this?

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5. The participant was asked to exercise on a treadmill. Before their exercise test,

they were resting, laying back in a recliner. Applying your knowledge of how venous

return is regulated, contrast how 3 factors influencing venous return would differ

between the two scenarios of supine rest before exercise and treadmill activity near

the end of exercise.

6. A new participant, who had a heart transplant six months ago, repeats the

experiment. Of interest, their resting heart rate is 15 beats/min higher than a normal

heart rate. How do you predict that this participant’s responses to exercise may

differ? Explain the rationale behind your answer.