In an interview with a professional mountain biker that developed an adverse reaction to the covid vaccine, this 29 year old athlete describes how his resting heart rate increased uncontrollably to over 135 beats per minute. As he described this disconcerting symptom, I wondered if it was the result of an ill effect on the nervous system, which controls the function of the heart. Many case studies have indeed been published describing neurological complications following the covid vaccines (see list of over 35 published medical journal articles below).