heart rate (BPM calculation) need to be revised LOL

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Boooooo
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heart rate (BPM calculation) need to be revised LOL

Post by Boooooo » April 17th, 2020, 3:22 pm

First of all probably is not only a BikErg PM5 issue/behaviour.

99% sure the heart rate (beats per minutes) showed next to each segment is NOT the average of the segment but the LAST value recorded before switch to the next segment.

Also the workout total (supposed) average BPM value is simply the arithmetic average of the "wrong" values told before lol (beside the "erraticity", also the last segment, could last few seconds only, "weight" the same as the others)

I believe having a real average heart rate would be great (the very best if showed during workout too) for example like already existing for cadence (RPM value) and power (Watts value) that have checked too and confirm are really the average value kept during the segment

Dangerscouse
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Re: heart rate (BPM calculation) need to be revised LOL

Post by Dangerscouse » April 17th, 2020, 3:46 pm

Totally agree. I find it annoying that it keeps spiking with about 100m to go in a split for a steady state session and then drops by 3 or 4 bpm within 30 secs.

I assume it can't be an average as I never see it as high throughout the split, but I doubt that C2 will change the monitor to show an average
51 HWT; 6' 4"; 1k= 3:09; 2k= 6:36; 5k= 17:19; 6k= 20:47; 10k= 35:46 30mins= 8,488m 60mins= 16,618m HM= 1:16.47; FM= 2:40:41; 50k= 3:16:09; 100k= 7:52:44; 12hrs = 153km

"You reap what you row"

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Citroen
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Re: heart rate (BPM calculation) need to be revised LOL

Post by Citroen » April 18th, 2020, 2:50 pm

Boooooo wrote:
April 17th, 2020, 3:22 pm
99% sure the heart rate (beats per minutes) showed next to each segment is NOT the average of the segment but the LAST value recorded before switch to the next segment.
Crazy as it seems that's how the PM2/PM2+/PM3/PM4 & PM5 have always recorded splits. You'd like to think it was a rolling average, but it's not. It is the instaneous value at the point when the split ends. Same with stroke rate and pace.

Boooooo
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Re: heart rate (BPM calculation) need to be revised LOL

Post by Boooooo » April 19th, 2020, 4:06 am

Citroen wrote:
April 18th, 2020, 2:50 pm
Same with stroke rate and pace.
do not believe that, only heart rate is not calculated; they are aware this their official reply (hope I am allowed should not be a secret :lol: )

Yes, the HR value shown on the split level are the last recorded HR.

Thank you for your feedback, perhaps the next generation of performance monitor on the Concept2 machines will have the capability to record average HR and set training zones.

Take care and be well!

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Carl Watts
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Re: heart rate (BPM calculation) need to be revised LOL

Post by Carl Watts » April 19th, 2020, 1:32 pm

Never really had a problem with it to be honest. As your fitness improves your average HR drops significantly and its reflected in the results. The error generated in the result caused by the HR chest strap not recording properly at the beginning of a row or dropouts caused by the battery in it going flat are a bigger problem.

If you understand how the hr measurement works in the first place its never going to be that accurate to start with. Your HR is very slow in frequency terms and not stable so to extrapolate the measurement out to beats per minute is not accurate anyway so the result is a reference value not an absolute value. Fortunately this average value changes significantly with your level of fitness or else the change would just get lost in the error you think your seeing in the results.

Confused ? Dont be. Just get your fitness level right up there then take 2 or 3 weeks off and do nothing. Jump straight back into it where you left off and watch your average HR go through the roof. Time out will see you jump right into the next HR training band with at least a 10bpm average increase after doing the same workout.
Carl Watts.
Age:58 Weight: 104kg Height:183cm
Concept 2 Monitor Service Technician & indoor rower.
http://log.concept2.com/profile/863525/log

Boooooo
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Re: heart rate (BPM calculation) need to be revised LOL

Post by Boooooo » April 20th, 2020, 2:53 am

Carl Watts wrote:
April 19th, 2020, 1:32 pm
... The error generated in the result caused by the HR chest strap not recording properly at the beginning of a row or dropouts caused by the battery in it going flat are a bigger problem.
recently my HR chest strap (high quality Polar H10 and with full battery) start having connecting problems (drops ed/or stucked for few minutes to a lower value than real) not happening immediately but after 30-40 minutes from the beginning of the workout.

Seems started since using simil airpod with bluetooth connection to listen videos played on the notepad in front of me. To investigate the issue so far had switched into ANT+ the chest strap connection to the PM5 (instead of bluetooth) but with no results

In your experience low PM5 battery could be the issue? Mine is around 16% (but increase when cycling) and never received "low battery" indication (will I receive?) I believe no because PM5 is a receiver, the transmitter battery is more important and it's full. By the way in the waiting for change I will try to cut the PM5 from the chest strap connection by connecting it only to the smartphone ErgData app, let see

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Re: heart rate (BPM calculation) need to be revised LOL

Post by Citroen » April 20th, 2020, 4:59 am

Boooooo wrote:
April 19th, 2020, 4:06 am
Citroen wrote:
April 18th, 2020, 2:50 pm
Same with stroke rate and pace.
do not believe that, only heart rate is not calculated; they are aware this their official reply (hope I am allowed should not be a secret :lol: )
You're wrong.

The PM5 watches the clock, measures watts, counts strokes and reads HR (if a HRM is connected). Nothing more. All other numbers are calculated.
All numbers recorded are instantaneous at the end of a split - always have been since PM2. There is no rolling average.

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Re: heart rate (BPM calculation) need to be revised LOL

Post by Boooooo » April 20th, 2020, 11:07 am

some pics from my first ever BikeErg workout :mrgreen:
Using ErgData app have the possibility to record CONTINUOS data and uploading to Strava (or similar apps) with full level of details

only HR shown is not the average (same story if consider each segment I will show in the next post)


Image

Image

Boooooo
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Re: heart rate (BPM calculation) need to be revised LOL

Post by Boooooo » April 20th, 2020, 11:22 am

Image

Boooooo
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Re: heart rate (BPM calculation) need to be revised LOL

Post by Boooooo » April 20th, 2020, 11:26 am

this happens because "Yes, the HR value shown on the split level are the last recorded HR."
(to be precise Watts and RPM differs too but by little value 1-2 but for sure ARE NOT the last value recorded, indeed are an average)

Image

Boooooo
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Re: heart rate (BPM calculation) need to be revised LOL

Post by Boooooo » April 20th, 2020, 11:48 am

(6th split snapshot then I stop I promise :mrgreen: )

only the last recorded value of HR is taken and put beside the 6th split level while I thougtht was an average

Image

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