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Electrocardiogram (ECG) frequency content

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Jul3-13, 05:35 AM
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What does the following bold sentence suggest about the above ECG signal?

The QRS complex corresponds to depolarization of the right and left ventricles. It lasts for about 70110 milliseconds in a normal heartbeat, and has the largest amplitude of the ECG waveforms. Due to its steep slopes, the frequency content of the QRS complex is considerably higher than that of the other ECG waves, and ismostly concentrated in the interval of 1040 Hz.
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Jul3-13, 09:27 AM
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High frequency signals change quickly. Conversely, rapidly changing signals are characterized by high frequency.

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