Frequency domain measures provide a more accurate assessment of heart rate changes compared to time domain measures. Low frequency changes, occurring every 10 to 20 seconds, are driven by adrenaline, while high frequency changes, occurring every one to two seconds, are associated with the parasympathetic nervous system. Analyzing the balance between high and low frequency changes throughout the day can indicate fluctuations in adrenaline levels. It's important to note that having a balance between high sympathetic and parasympathetic tone is essential for optimal physiological function, akin to needing both a good accelerator and brakes in a car.

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