Rest = 0.304 TAE = 0.148 R = 0.17 4. How does the average T-P interval from rest, immediately after exercise and at 5 minutes after exercise (recovery) compare? Do you see any variation or trend?
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1.) Why is there a significant change in TP intervals in individuals before and after exercise, using knowledge of the cardiac cycle and electrical activity. 2.) Why is there a change in TP intervals before and after exercise and what causes it. Use knowledge of the cardiac cycle and stroke volume.
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7. Transfer the values of the means from Tables 2 and 3 into Table 4 below. Then calculate the amount each portion of the ECG changed with exercise. Table 4: Comparing ECG Before and After Exercise Time in milliseconds (ms). Average Resting Mean Exercise Mean Change P wave 60 to 110 103 97 6 P-R interval 120 to 200 127 109 18 P-R segment 80 59 53 6 QRS complex 120 or less 87 87 0 S-T segment 120 79 40 39 Q-T interval 310 to 410 357 269 88 T wave 160 227 197 32 End of T to next R Varies 553 459 94 Data Analysis Questions 8. Give the equation the computer uses to calculate BPM using ΔT. Units= beats / sec or beats / min 9. Describe the relationship between ΔT and BPM. For instance, if ΔT gets shorter what happens to BPM? 10. In Table 4, when comparing "resting" to "exercise", which component of the ECG trace decreased the most? By how many ms did this component shorten? 11. Does it make sense that the component you named in #10 shortened the most? Why or why not?
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The following two graphs are comprised of the same data from 10 individuals, for 30 minutes. The data are presented in bar graph format (A) and scatter plot format (B, where each individual is shown in a different color) and show the heart rate (in beats per minute; bpm) at rest and at 10 minute intervals throughout the exercise. Statistical analyses revealed increased heart rate at 20 min compared with rest, at 30 min compared with rest, and at 10 min compared with rest. All p-values were less than 0.05.
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