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CSTUEMER
09-19-2009, 06:15 AM
Hello,

in the recorded tcx files of the 310xt I can see that the heart beat is not written for all trackpoints:

<Trackpoint>
<Time>2009-09-17T11:00:41Z</Time>
<Position>
<LatitudeDegrees>52.4937926</LatitudeDegrees>
<LongitudeDegrees>13.2567849</LongitudeDegrees>
</Position>
<AltitudeMeters>70.2000000</AltitudeMeters>
<DistanceMeters>62.0000000</DistanceMeters>
<HeartRateBpm xsi:type="HeartRateInBeatsPerMinute_t">
<Value>92</Value>
</HeartRateBpm>
<Extensions>
<TPX xmlns="http://www.garmin.com/xmlschemas/ActivityExtension/v2" CadenceSensor="Footpod">
<Speed>1.4770001</Speed>
</TPX>
</Extensions>
</Trackpoint>
<Trackpoint>
<Time>2009-09-17T11:00:52Z</Time>
<Position>
<LatitudeDegrees>52.4939702</LatitudeDegrees>
<LongitudeDegrees>13.2568171</LongitudeDegrees>
</Position>
<AltitudeMeters>60.0000000</AltitudeMeters>
</Trackpoint>
<Trackpoint>
<Time>2009-09-17T11:00:54Z</Time>
<Position>
<LatitudeDegrees>52.4939835</LatitudeDegrees>
<LongitudeDegrees>13.2567866</LongitudeDegrees>
</Position>
<AltitudeMeters>63.0000000</AltitudeMeters>
<DistanceMeters>83.4799957</DistanceMeters>
<HeartRateBpm xsi:type="HeartRateInBeatsPerMinute_t">
<Value>92</Value>
</HeartRateBpm>
<Extensions>
<TPX xmlns="http://www.garmin.com/xmlschemas/ActivityExtension/v2" CadenceSensor="Footpod">
<Speed>1.7930001</Speed>
</TPX>
</Extensions>
</Trackpoint>


This kind of recording differs IMHO from other devices like edge series and it leads to the situation that the tcx-converter can't create a valid hrm-file for the import in 3rd party tools.

Does anybody knows the "system" behind - when the HeartRateBpm is written and when not?

DW152
09-19-2009, 06:26 AM
This issue surfaced back in July when the 310 first started being used.

However, I don't know the logic behind when an HR value is written and when it is not.

t_smit
09-19-2009, 09:04 AM
Does your heart rate track look OK in GC or TC? An 11 second gap in track points implies that you were doing maybe smart recording and you weren't moving... or else the 310 radio had lost the heart rate monitor and didn't get it back until 11:00:54.

I'm not familiar with the ins and outs of using other analysis tools but you might have to use one-second recording to get a good trace.

CSTUEMER
09-19-2009, 11:42 AM
Does your heart rate track look OK in GC or TC? An 11 second gap in track points implies that you were doing maybe smart recording and you weren't moving... or else the 310 radio had lost the heart rate monitor and didn't get it back until 11:00:54.

I'm not familiar with the ins and outs of using other analysis tools but you might have to use one-second recording to get a good trace.

Yes, heart rate track look OK in GC or TC
Is it possible to change the kind of recording on the 310xt ?

SEILOGRAMP
09-19-2009, 12:28 PM
Yes, heart rate track look OK in GC or TC
Is it possible to change the kind of recording on the 310xt ?

No, the 310 only allows smart recording.

CSTUEMER
09-20-2009, 12:59 PM
Okay, is there anybody from Garmin who could confirm, that the 310Xt is using "smart recoding" not only for the GPS-position, but also for the recoding of heartbeat data ?

DCRAINMAKER
09-20-2009, 10:21 PM
Okay, is there anybody from Garmin who could confirm, that the 310Xt is using "smart recoding" not only for the GPS-position, but also for the recoding of heartbeat data ?

I'm not from Garmin, but I can certainly confirm that. The exception is for Power Meters, and then the 310XT switches over to 1s mode. I'm looking at a slew of files and all vary between 1-4s or so between trackpoints. With the exception being bike-produced ones with a PM, where it shows every second.

That said - what TCX converter are you using? From a data structure standpoint, I'd expect any TCX convert reading the XML-based files to simply skip missing data points - in the same manner that if a cadence point were dropped or somthing, it wouldn't fail the entire file. Many non-Garmin applications out there today can do this without issue - Training Peaks, Sports Tracks, WKO+, Power Agent, iBike, Golden Cheetah, etc...to name a few I've tried.

NDURANCERIDER
09-21-2009, 08:09 AM
In the past, smart recording would write out all the information (position, heart rate, cadence, etc) for every trackpoint. However, in the 310xt, this isn't necessarily so. If there is no change in HR (or any of the other metrics), then the HR (or other metric) might not be saved with that trackpoint.

If the Smart Recording isn't recording properly (ie, your hr wasn't steady during that time), you should open a ticket with Garmin Support (http://www.garmin.com/support).

April