Discussions By Condition: Cardiovascular disease

Sudden halving of heart rate during exercise

Posted In: Cardiovascular disease 2 Replies
  • Posted By: Crawfee
  • January 8, 2007
  • 07:48 PM

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?


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2 Replies:

  • I've had a similar problem... Last year, when I was anorectic with bulimic tendencies (BMI of 15), when I was working out at school and even sweating like mad, I used to have an heart rate of 70-120 (only when exhausted) and my teacher wanted me to have 160 at least. But I couldn't. I've never been able to achieve it and then on another cardio machine, I would get 192 and not be exhausted at all. It has been weird.
    Anonymous 42789 Replies
    • January 31, 2008
    • 03:51 AM
    • 0
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  • This would seem to be the opposite of what I swear nearly killed me last spring. :( I believe the name for this is paroxysmal sinus bradycardia that is, a sudden marked decrease in heart rate, usually by half. I don't know much about it expect in contrast to paroxysmal supraventricual tachycardia, which is a sudden doubling of heart rate.:eek:
    Scotticus 20 Replies
    • February 9, 2008
    • 06:28 AM
    • 0
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