I saw your facebook post about VNS 40hz and Alzheimer's with my quotes, I was shocked, but it also shows that they were genuine quotes from a real person

The vagus nerve is the main parasympathetic nerve to the heart, providing rest and digest counterbalance to sympathetic fight or flight signals. Vagal stimulation slows heart rate, reduces contractile force, and promotes coronary artery dilation. The right vagus nerve has denser cardiac projections than the left, explaining avoidance of right-sided stimulation in VNS to prevent bradycardia or transient asystole. Through cardiac branches, the vagus nerve influences heart rate by slowing the sinoatrial node, rhythm by modulating atrioventricular node conduction, contractility by reducing force during rest, coronary blood flow by dilating arteries, baroreceptor sensitivity for blood pressure responses to position changes, and heart rate variability. Heart rate variability (HRV) measures variation in time between consecutive heartbeats. Higher HRV reflects dynamic sympathetic-parasympathetic interplay, stronger vagal tone, better autonomic balance, improved cardiovascular health, lower stress, and reduced mortality risk. Low HRV indicates vagal withdrawal and sympathetic dominance, linked to increased risk of coronary artery disease, heart attacks, sudden cardiac death, heart failure progression, hypertension, type 2 diabetes, all-cause mortality, chronic stress, burnout, anxiety, depression, poor physical fitness, inflammation, aging, and reduced longevity. Vagus nerve stimulation (VNS) targets cardiovascular conditions. In chronic heart failure, VNS restores autonomic balance, potentially improving cardiac function, exercise tolerance, and quality of life; early trials show promise as adjunctive therapy. For arrhythmia management, VNS modulates electrical conduction, relevant for atrial fibrillation and supraventricular arrhythmias, potentially reducing episodes or enhancing treatment outcomes. In hypertension, VNS enhances baroreflex sensitivity for blood pressure regulation during postural changes and stress, offering benefits for resistant cases. Post-myocardial infarction, VNS addresses persistent autonomic dysfunction to improve long-term outcomes and prevent recurrence. In coronary artery disease, vagal stimulation promotes vasodilation, improves endothelial function, and may reduce atherosclerotic progression.

As I have typed before, just got a new HRV device. I have just done 5 minutes aside on my neck and my HRV slightly changed. I normally do small circles in the correct place, but surprised that it didn't change as much like my 3 minute cold shower. is this what we would expect or not?

I received my HRV device yesterday and it says that a high HRV is good and a lower one may be an indication of something wrong. When we stimulate our vagus nerve its to make the HRV lower, so how do we judge what a good HRV number is? and also does age affect the HRV? is there some sort of chart to refer to, if it does? I'm 55 and it seems like my high and low scores are 48 to 30.

my HRV device arrived yesterday and I have been wearing it for about 24 hrs. I had a cold shower and my HRV went from 48 to 30 and then some time after I did the Norwegian 4x4 interval training and my HRV went down about the same amount. I have been sitting down and relaxing for about over an hour and my HRV is about 30 again. In each case has my body responded in the correct manner?