It doesn’t help you, but I have Wahoo TickrX and it never fails me.
I also have Garmin Dual, which is equally good, but the batteries wear out much faster and are stupidly difficult to change. Same 2032 coin cell, but 4 tiny screws for the lid.
Garmin watches are good, I have a Fēnix 5s, but as I bought the Apple series 5 last December, I don’t use it anymore.
Which PM do you have?
Hi everyone,
did a couple more rides. On one indoor ride with some sprints the max HR on the Viiiva was 168. Next ride you can see some obvious jumps from about 170 to 200+ values.
4iiii will take the unit back. I’ll look for a way to delete the HR data here from my earlier activities as they will probably mess up my data.
My apologies to everyone who wasted time here trying to tell me what I didn’t want to see! Learnt a lesson… In the meantime, I’ll try to learn all the ins and outs of intervals to see how I can use it best.
cheers,
p
You’re welcome 
I hope the replacement will be better, otherwise dump it and go for a Wahoo Tickr(X)…
New one came out yesterday. I bought a viiiiva as it also acts as a ant+ to BT bridge for my trainer. But since it doesn’t send back ef-c to the trainer, it’s of no use in ERG mode. If I had known I would have bought a tickr or tickrX…
You can click the cog icon under the ride timeline chart to tell Intervals.icu to ignore power and/or HR etc.
Wow that explains the HR charts and the “broken” HR strap. My wife had a similar problem with arrhythmia. She does a bit of trail running, MTB and road cycling and sometimes her HR would jump to 240bpm+ and she just collapsed, not even able to walk. This happened on a run in bad weather and she spent nearly an hour getting cold on the mountain.
So she saw a specialist and had the ablation procedure. They trigger the problem on a scope using a probe and “zap” the bits of heart that are causing the short circuit. It was very successful for her, she has not had any problems since.
So if yours does start happening at lower HR you might want to investigate that option.
