HR rises & falls twice (Up, down, up, down) during each set of inspiration & expiration. Shown in ANS tests. Variation of normal Sinus Arrhythmia? Or?

Sinus arrhythmia. Sinus arrhythmia only reflects an exaggeration of a normal behavior. Everyone's HR tends to vary slightly with the normal changes in pressure in the chest with breathing. Your HR should increase with inspiration and decrease with expiration. If this variation is quite obvious, then we call it a "sinus arrhythmia," but it's not generally clinically significant. .