At the end of my tempo run these last few weeks, my heart rate has stopped rising. When I look at the HR graph for the run, I'm experiencing textbook cardiac drift until the last 3ish minutes when it just stops going up. This usually occurs at a HR about 25 bpm below my max HR(Hit 218bpm kicking at the end of a 5k). Because I'm still a ways below my max HR, this has left me quite confused. Anyone have an explanation for this?
Is your pace increasing, decreasing, or staying the same? If it is staying the same, this is supposed to happen absent external factors like increasing body temperature or dehydration. Think about it: at any given pace your cardiac output is X. If you run that pace, your heart rate will eventually reach X and then it shouldn't rise any more because power demands are the same, unless some other factor changes your heart's demands.
Cmdjficiviiv wrote:
Is your pace increasing, decreasing, or staying the same? If it is staying the same, this is supposed to happen absent external factors like increasing body temperature or dehydration. Think about it: at any given pace your cardiac output is X. If you run that pace, your heart rate will eventually reach X and then it shouldn't rise any more because power demands are the same, unless some other factor changes your heart's demands.
that's not really how it works. google cardiac drift. your HR rises slowly at even efforts and at some point, like at the end of a marathon, it rises even faster.
OP my guess is that your HR stopped rising because you knew the tempo was almost over and your brain checked out a little bit. In other words, it was mental, not physical.
You have to run faster if you're trying to get a heart attack.
reed wrote:
HR rises slowly at even efforts and at some point, like at the end of a marathon, it rises even faster.
No.
OP, the most likely scenario is fatigue. Meaning, you crossed your lactate threshold, or nearly so earlier in the run. Or, you are coming into your event too tired. Or....
Since you posted no training information at all, it's hard to know where to start.
My Garmin 610 does this if I approach my max heart rate as input on
SetUp>Heart Rate Monitor> Heart Rate Zones
somehow acquired a value of 171 and readings of Heart Rate started to decline
at 168 to 167,166,165 just not right...