“40 BPM heart rate ”

At your age brief bradycardia is likely related to the variations in the autonomic nervous system. The influence of the vagal tone. The 10 cranial nerve innervates the organs in the chest and abdomen. The brain can augment heart rate and contractile function of the heart throughout the day. The balance between the sympathetic nervous system, which releases noradrenaline, increases heart rate and contraction of the heart and causes the blood vessels to constrict. Heart rate and blood pressure and cardiac output increase. The parasympathetic nervous system does the opposite. It releases acetylcholine via the vagus nerve and lowers heart rate and dilates the blood vessel and blood pressure drops. They are in balance in most of us ( sympathetic turns organs on during the daily activities and parasympathetic shuts body down at night while sleeping). Dysautonomia is a group of diseases where the brain is signaling the wrong system and symptoms can develop ( syncope, dizzy, palpitations, fast heart rate, etc). The severe cases can get very lightheaded and pass out if standing up too fast. We do a tilt table test to diagnose this disease and treat it with high sodium diets, hydration and certain exercise maneuvers. We especially see this in young , healthy patients with anxiety disorders. The symptoms follow the mood. When the anxiety flares up, they get worse, and vice versa. You are fine. The chances of electrical conductivity disorders in a young healthy patient are very very rare. If that were the case , your heart rate would stay low all the time and cause symptoms. With exercising your heart rate wouldnt increase as necessary and your cardiac output would not be able to sustain the increased workload. You would be fatigued and lightheaded etc. that would require a pacemaker. You dont have and inherent electrical dysfunction and dont need meds or a pacemaker. Check your heart rate with exercise and it should go up to 85% of max (220-age is max). If it doesnt then contact your primary physician. In 20 years of practice Ive never seen a young healthy patient require a pacemaker unless they were born with a congenital electrical heart block. They wouldnt get their heart rate above 40. You are healthy and fine. Quit following your heart rate so closely. Forget about these fluctuations. Sometimes too much technology is not a good thing..