what are some reasons why the QRS amplitude and QRS duration would increase afte

Question

what are some reasons why the QRS amplitude and QRS duration would increase after exercise on an ECG?

urements , IIsing the data from Tables 2, 3, and 4, calculate the percent change for the 00. Tske) 4 Using r helow: Percent Change - (after exercise - before exercise)/before exercise) negative absolute value of the difference between before and after exercise (nore aer calcu Indicate whether the percent change is an increase or a decrease. If Means the Mean values. Resting Values After Exercise Segment 2 Segment 4 Percent Chan Measurement Heart Rate R-R Interval P wave duration P wave amplitudeaa el63 PR interval PR segment QRS duration | QRS amplitude .91 ST segment T wave duration T wave amplitudeoB QT interval ventricular diastole l - 1s6 -330 enticular systole -360sc 13 h

Explanation / Answer

Exercise is an energy intensive phenomenon in which the cell's ATP stores begin to reduce. Hence the cells, esp muscle cells, require more oxygen to burn glucose and generate ATP for the cell. More oxygen is associated with more transport for which large amount of blood must be pumped. Pumping of blood from heart to the rest of the body occurs when the ventricles contract (ventricular systole) which is displayed as QRS on the ECG. Hence for pumping large amount of blood, ventricular systole should be stronger and so the ORS of higher amplitude. Also for more blood, the ventricles should contract strongly and completely and hence larger duration of QRS.

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