Question

Discussion 1. How does the heart rate from the subject at rest, immediately after exercise, and at 1 min, and 2 min after exercise compare? Explain the physiological reasons for any differences. 3. What is occurring during the P-Q interval? How do the average P-Q intervals from rest and each time interval compare? How does the average at rest value compare to the "normal" value? 4. What is occurring during the Q-T interval? How does the average Q-T interval from rest and each time interval compare? How does the average at rest value compare to the "normal" value? 5. What is occurring during the T-Q interval? How does the average T-Q interval from rest and each time interval compare? Explain any variations. 6. What does the R-Peak Flow interval represent? (What is occurring during this interval?) How does the average R-Peak Flow interval from rest and each time interval compare? Explain any variations. 7. How does the average pulse-wave amplitude from rest and each time interval compare? Explain any variations. 8. Explain the effect of exercise on the blood flow through the subject's finger.

I need these questions answered as well please

Answer 1

Answer1 : Heat rate is the number of contractions or beats of heart per minute and it varies according to oxygen absorbed and carbon dioxide given out by our body and when body is at rest it ranges from 60 -100bpmheart rate , during exercise is considered to be due to the combination of parasympathetic withdrawal and sympathetic activation so it increases. During body muscles increases their activity and it start consuming more amount of oxygen , increases cardiac output as compare to heart at rest.

Heart rate drops in the first minute when we stop exercising; it should then fall about 20 beats a minute (recovery heart rate and 50 to 60 beats in one minute is considered excellent)

Answer 3: PQ interval (PR interval as a Q wave is not always present) indicates how fast the action potential is transmitted through the AV node (atrioventricular) from the atria to the ventricles.

PQ interval represents the time from the beginning of atrial depolarization to the beginning of ventricular depolarization. (0.12-0.20 seconds), it is shorter in children and longer in older persons. The QRS complex represents depolarization of the ventricles (less than 100 milliseconds)

Answer 4: QT interval is beginning of QRS complex to the end of t-wave and it represent ventricular systole and its value should be less than half of a cardiac cycle normal QT interval is below 400 to 440 milliseconds (ms), or 0.4 to 0.44 seconds. Women have a longer QT interval than men.It is measured from the beginning of the QRS complex to the end of the T wave and averaged over 3 to 5 beats.

Answer 5: TQ interval is the ECG equivalent to the diastolic interval and thus measuring the lower limit for 95% of the beats was utilized

(Note: Normal values

• RR interval: 0.6-1.2 seconds.
• P wave: 80 milliseconds.
• PR interval: 120-200 milliseconds.
• PR segment: 50-120 milliseconds.
• QRS complex: 80-100 milliseconds.
• ST segment: 80-120 milliseconds.
• T wave: 160 milliseconds.

Heart beat at rest is lower but after exercise, the heart rate is faster than normal but slowly returned to normal after a good few seconds. The average P-R interval during rest displays a higher value than that of the average for each time period in recovery. The average for each time period in recovery increases value trend starting from the first 30 seconds of the duration/The normal values for the QT interval depend on the heart rate. As the heart rate increases (RR interval shortens), the QT interval normally shortens; as the heart rate decreases (RR interval lengthens), the QT interval lengthens. The RR interval, as described later, is the interval between consecutive QRS complexes )