In my opinion it differs per person and per type of sport.
Some people adapt very quickly to exercising while others don't ever develop an athlete's heart, no matter how much they exercise.
Also the type of adaption to the exercise differs per person. Some people develop a very low resting heart rate while others get an increased heart muscle size or heart chamber volume.
Misdiagnosis easily happens. A resting heart rate of 40 is easily misinterpreted as bradycardia, etc. Therefore the patient should always indicate when he/she is an active athlete.
OK, KIND OF LIKE ENDURANCE ATHLETE VS RESISTANCE AND SO ON. EACH WILL SHOW A DIFFERENT THING DUE TO TRAINING REGIME ?
WHEN YOU HEAR OF SOMETHING LIKE ' 24 YEAR OLD COLLAPSED AND DIED DUE TO HEART FAILURE ' - ' THE INDIVIDUAL REPORTED SHE HAD WENT TO SEE HER GP A FEW DAYS BEFORE AND WAS TOLD IT WAS ANXIETY OR ACID REFLUX ' - this is the kind of thing i dont understand. is it a possibility that MAJORITY of people dont tell the full story of symptoms theyve been having? Or maybe is it that the GP didnt think it would warrant a ECG ?
I mean it differs from person to person. Two cyclists going through same exercise program. One develops athlete's heart, other one does not.
Yes, sadly it happens what you describe. People that seem healthy or were told that they were fine suddenly die. Our healthcare system is not flawless.
Doctors do the best they can based on what they can see/measure and what the patient tells them. Sometimes a mistake is made, sometimes ..., well lets call it bad luck.