At the gym this morning, after 35 mins on cross trainer (which is average for me) I decided to go for it for the final 5 mins.
Suddenly my heart rate dropped from 160'ish to 80.
I stopped immediately and restarted the machine - it then ranged from 85 to 116.
Felt light headed for an hour or so afterwards and had slight pain in centre of chest.
Spoke to doc this afternoon and had an ECG.
It seems I have a long QS interval and my heart has been unable to beat in time (electrical response of somekind) and instead beat every second beat (hence the apparent halving of the rate).
Never had any problems before, 36 years old, male, non smoker and a bit overweight but not a lot.
Anyone else heard of similar / any ideas on name for the condition?