Parasympathetic Vagal Tone is the “brakes of the human body”. It is involved with restoration and repair, nourishment, digestion and detoxification, immunologic balance, and provides our innate sense of vitality and well-being. This control of the sympatho-vagal response is mediated through the 10th cranial nerve (vagus nerve) and results in slowing of the heart rate, controlling sweating, regulating blood pressure, stimulating peristalsis and controlling vascular tone. Low HF values are cited with poor sports recovery and reduced muscles strength and sub-optimal health. Parasympathetic health is represented in vagal tone and is measured in Electro-Cardiogram (ECG) testing as the marker High Frequency (HF).