The simulation animates a beating heart alongside a live R-R interval trace, showing how simulated sympathetic and parasympathetic activity stretch and compress consecutive beat intervals, while a running RMSSD calculation and a frequency-domain LF/HF breakdown update in real time as the balance shifts.
Adjust the sympathetic and parasympathetic activity sliders to simulate stress versus relaxation, press play to watch the R-R interval trace and heartbeat animation respond beat by beat, and observe how the computed RMSSD value and the LF/HF frequency split change as the autonomic balance tips one way or the other.
Sympathetic activity slider, parasympathetic activity slider, play/pause beat animation, RMSSD and LF/HF readout toggle
Elite endurance athletes often show resting RMSSD values several times higher than sedentary individuals of the same age, and many use daily morning HRV readings, taken lying down right after waking, as an early warning system for overtraining before performance or mood even start to suffer.
The simulation animates a beating heart alongside a live R-R interval trace, showing how simulated sympathetic and parasympathetic activity stretch and compress consecutive beat intervals, while a running RMSSD calculation and a frequency-domain LF/HF breakdown update in real time as the balance shifts.
The simulation animates a beating heart alongside a live R-R interval trace, showing how simulated sympathetic and parasympathetic activity stretch and compress consecutive beat intervals, while a running RMSSD calculation and a frequency-domain LF/HF breakdown update in real time as the balance shifts.
Adjust the sympathetic and parasympathetic activity sliders to simulate stress versus relaxation, press play to watch the R-R interval trace and heartbeat animation respond beat by beat, and observe how the computed RMSSD value and the LF/HF frequency split change as the autonomic balance tips one way or the other.
Elite endurance athletes often show resting RMSSD values several times higher than sedentary individuals of the same age, and many use daily morning HRV readings, taken lying down right after waking, as an early warning system for overtraining before performance or mood even start to suffer.