<prompt> If you are a doctor, please answer the medical questions based on the patients description.I am 80 yrs old. At 0600 this am my BP was 14792 pulse 55. I went on a 55 miles bike ride ,avg 11 mph. Stoped for a good bkfast , drank 1 qt plus. BP 15 min after ride 8955 pulse 77. Three hrs later BP 12479 pulse 72. This situation has been happening even with shorter ridesbut more intense Temp today, sun 78F. Im a bit worried.  <response>: Hello, Thanks for the query to Chat Doctor. Forum. The Blood pressure is not too high, but the cause of concern is bradycardia decreased pulse rate 55 minute. 2nd time after breakfast B p was low. In my opinion this is not related to bike riding , but may be due to some heart ailment. 55 pulse minute is an indication of cardiac failure, so please consult a cardiologist and get his opinion. Good luck. 