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17 April 2018 03:15 PM

glever Newbie

Total Posts: 1

Joined 2017-08-01

Hello,

I'm interfacing with my Garmin HRM3SS strap (through homebrew java library) and wanted to do some Heart Rate Variability analysis.
The main datapage that is being received is DataPage4-PreviousHeartBeatEvent but it seems that even though the monitor sends at 4 Hz, it only updates every 4 packages.
The channel should have been set up according to the Hrm Device Profile Data sheet.

.....
HRMChannel - Received HrmDataPage4PreviousHeartBeatEvent{heartBeatEventTime=60000.0,heartBeatCount=232,computedHeartRateInBpm=65,previousEventTime=59000.0}
HRMChannel - Received HrmDataPage4PreviousHeartBeatEvent{heartBeatEventTime=60000.0,heartBeatCount=232,computedHeartRateInBpm=65,previousEventTime=59000.0}
HRMChannel - Received HrmDataPage4PreviousHeartBeatEvent{heartBeatEventTime=60000.0,heartBeatCount=232,computedHeartRateInBpm=65,previousEventTime=59000.0}
HRMChannel - Received HrmDataPage4PreviousHeartBeatEvent{heartBeatEventTime=61000.0,heartBeatCount=233,computedHeartRateInBpm=64,previousEventTime=60000.0}
HRMChannel - StatSummary{currentBeat=HrmDataPage4PreviousHeartBeatEvent{heartBeatEventTime=61000.0,heartBeatCount=233,computedHeartRateInBpm=64,previousEventTime=60000.0}, delta=1000.0, meanRr=-900.0, stdDevRr=100.0, rmssd=426.4014327112209}
HRMChannel - Received HrmDataPage4PreviousHeartBeatEvent{heartBeatEventTime=61000.0,heartBeatCount=233,computedHeartRateInBpm=64,previousEventTime=60000.0}
HRMChannel - Received HrmDataPage4PreviousHeartBeatEvent{heartBeatEventTime=61000.0,heartBeatCount=233,computedHeartRateInBpm=64,previousEventTime=60000.0}
HRMChannel - Received HrmDataPage4PreviousHeartBeatEvent{heartBeatEventTime=61000.0,heartBeatCount=233,computedHeartRateInBpm=64,previousEventTime=60000.0}
HRMChannel - Received HrmDataPage4PreviousHeartBeatEvent{heartBeatEventTime=62000.0,heartBeatCount=234,computedHeartRateInBpm=64,previousEventTime=61000.0}
... etc ... 

(The values from the datapage are directly derived from the received bytes. I did have to fight java a bit for the ushort => int conversion, but am pretty confident they are finally correct...)

Am I overlooking something?
If not, does anyone know an HRM strap that does provide the granularity to perform HRV analysis?

Many thanks,
Glen

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