Odd HRM readings.

I just got my first heart rate monitor a couple of days ago, and I've used it twice during my morning jog. But yesterday it said my average heart rate for the half hour run was 140bpm (which seemed high to me) and this morning it said my average was 125bpm. That's a pretty big difference, and I'm just wondering what happened. The HRM is a Timex T5J031 watch with a chest band sensor. Can you get a spuriously high reading by getting the chest band on wrong?
 
hmm.. seems odd. was the intensity the same for both runs?

Most HR monitors will have something blinking when it registers a heart beat, you can always put your finger on your neck just to see if it's the same.
 
it depends what condition your in. i probably am averaging that just know even though i go a slow pace. i wouldnt say its a particularly high average. also it may be higher than usual if you havent recovered properly and i take it (your morning jog) means you run everyday which is perhaps too much. how old are you? how long have you been running?
 
To answer your question, you can get occasional non-signals and you can get unrealistic numbers (e.g., 200+), but I doubt there was a problem with the equipment if you got realistic numbers like that. Was today's effort less than yesterday's? Same route? My training numbers are a little more consistent than that running, but I can easily have that wide of a variance, or more, on the bike.
 
it depends what condition your in. i probably am averaging that just know even though i go a slow pace. i wouldnt say its a particularly high average. also it may be higher than usual if you havent recovered properly and i take it (your morning jog) means you run everyday which is perhaps too much. how old are you? how long have you been running?
I'm 67, and I've been jogging every morning for around 25 years. Not fast or far, but consistently. I did take a few days off a couple of weeks ago, trying to recover from a touch of plantar fasciitis, but I started up again very cautiously. I suppose the loss of conditioning might explain a high heart rate yesterday, but what puzzles me is how I could recover in just a single day.
 
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To answer your question, you can get occasional non-signals and you can get unrealistic numbers (e.g., 200+), but I doubt there was a problem with the equipment if you got realistic numbers like that.
I doubt it, too. Same route, same time to within 20 seconds for the 33 minute run. I had the watch split it into laps and give my average hr for each, and everything about the runs was comparable and consistent, except my hr yesterday was around 15 bpm higher throughout the run. Very odd.
 
Most HR monitors will have something blinking when it registers a heart beat, you can always put your finger on your neck just to see if it's the same.
Yes, my Timex has a little heart symbol which is an empty outline when the watch can't find the sensor's signal, but a cute pulsing pattern when it does find it. I've only taken my pulse and compared my resting rate to what the watch says, but that was very close. The watch gives sensible results for hr in various ordinary circumstances.
 
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