Heart Rate Variability

Heart Rate Variability


It is generally assumed that heart rate is fairly constant, becoming gradually elevated during periods of exertion then reducing during rest.

The time period between the impulses that stimulate the heart to beat (known as R-R Interval) actually varies significantly for a constant average heart rate.

This variation known as Heart Rate Variability (HRV) can provide interesting information about the subject, such as:

- Indication of over-training (1) (2)
- Monitoring recovery from a competition or workout (3)
- Identifying when the athlete is able to undertake hard training (4)

Various parameters have been established to classify HRV, the most notable being SDSD,; RMSSD; SD1 and SD2

This app calculates and displays these parameters in pseudo real time (update every 5 seconds based on the most recent 60 heartbeats). Also displayed is a histogram of the most recent SD1 values

In order to maintain reasonable stability in the parameters it is necessary to remove ectopic beats from the data set. Ectopic beats are when there is a short R-R interval followed immediately by a long R-R interval, the average of the two being similar to the R-R intervals either side of the ectopic beat.



Notes
1. This app is for general interest only and SHOULD NOT be used for any clinical purpose.
2. CONSULT YOUR PHYSICIAN before undertaking any strenuous activity
3. This app requires a Polar Wearlink+ Transmitter With Bluetooth (Available from Amazon)
- NOTE If you have a Bluetooth Low Energy Chest-strap such as Polar H7 or Zephyr HxM check out the new app HRVxt
4. App has been tested on Samsung S3 and S4

References
1. Effect of overreaching on cognitive performance and related cardiac autonomic control. Dupuy et.al, Scand J Med Sci Sports 2012
2. Decrease in heart rate variability with over-training: assessment by the Poincare´ plot analysis. Mourot et.al, Clin Physiol Funct Imaging (2004) 24
3. Heart rate variability before and after cycle exercise in relation to different body positions. Barak et.al; Journal of Sports Science and Medicine (2010) 9.
4. Endurance training guided individually by daily heart rate variability measurements; Kiviniemi et.al; Eur J Appl Physiol

Andrew Flatt has an excellent blog on HRV training that can be found here: HTTP://hrvtraining.com/

The Pro version of this app, now available (search Heart Rate Variability - Pro) will save all the R-R intervals (in mS) to a file that can be imported into a spreadsheet or Kubios HRV analysis software. In addition, a separate file will be generated that records all the parameters displayed on the screen, with the line numbers in the R-R file that were used to generate those values.

Recent changes:
V3.00

- Added LF/HF live display
- Ectopic beat detection now more aggressive
- App saves 2 files after approximately 200 beats have been received, File 'year-month-day-time-r2r' contains 60 beats.

V3.01

- Minor bug fix for users who have experience a crash
Add to list
Free
55
2.8
User ratings
40
Installs
5,000+
Concerns
0
File size
333 kb
Screenshots
Screenshot of Heart Rate Variability Screenshot of Heart Rate Variability
About Heart Rate Variability
It is generally assumed that heart rate is fairly constant, becoming gradually elevated during periods of exertion then reducing during rest.

The time period between the impulses that stimulate the heart to beat (known as R-R Interval) actually varies significantly for a constant average heart rate.

This variation known as Heart Rate Variability (HRV) can provide interesting information about the subject, such as:

- Indication of over-training (1) (2)
- Monitoring recovery from a competition or workout (3)
- Identifying when the athlete is able to undertake hard training (4)

Various parameters have been established to classify HRV, the most notable being SDSD,; RMSSD; SD1 and SD2

This app calculates and displays these parameters in pseudo real time (update every 5 seconds based on the most recent 60 heartbeats). Also displayed is a histogram of the most recent SD1 values

In order to maintain reasonable stability in the parameters it is necessary to remove ectopic beats from the data set. Ectopic beats are when there is a short R-R interval followed immediately by a long R-R interval, the average of the two being similar to the R-R intervals either side of the ectopic beat.



Notes
1. This app is for general interest only and SHOULD NOT be used for any clinical purpose.
2. CONSULT YOUR PHYSICIAN before undertaking any strenuous activity
3. This app requires a Polar Wearlink+ Transmitter With Bluetooth (Available from Amazon)
- NOTE If you have a Bluetooth Low Energy Chest-strap such as Polar H7 or Zephyr HxM check out the new app HRVxt
4. App has been tested on Samsung S3 and S4

References
1. Effect of overreaching on cognitive performance and related cardiac autonomic control. Dupuy et.al, Scand J Med Sci Sports 2012
2. Decrease in heart rate variability with over-training: assessment by the Poincare´ plot analysis. Mourot et.al, Clin Physiol Funct Imaging (2004) 24
3. Heart rate variability before and after cycle exercise in relation to different body positions. Barak et.al; Journal of Sports Science and Medicine (2010) 9.
4. Endurance training guided individually by daily heart rate variability measurements; Kiviniemi et.al; Eur J Appl Physiol

Andrew Flatt has an excellent blog on HRV training that can be found here: HTTP://hrvtraining.com/

The Pro version of this app, now available (search Heart Rate Variability - Pro) will save all the R-R intervals (in mS) to a file that can be imported into a spreadsheet or Kubios HRV analysis software. In addition, a separate file will be generated that records all the parameters displayed on the screen, with the line numbers in the R-R file that were used to generate those values.

Recent changes:
V3.00

- Added LF/HF live display
- Ectopic beat detection now more aggressive
- App saves 2 files after approximately 200 beats have been received, File 'year-month-day-time-r2r' contains 60 beats.

V3.01

- Minor bug fix for users who have experience a crash
Android Market Comments
A Google User
Jan 3, 2015
Pro version failure. Originally gave this full marks and bought the pro version, which was quite pricey, relative to similar apps, but I lost the paid for functionality and now still have the free version albeit paid for. I feel ripped off.
A Google User
Jan 3, 2015
No Bluetooth no game If you don't have Bluetooth you can't play it,sorry
A Google User
Jun 3, 2014
Help me please Wearing a new polar heart link, paired to my note3 and the app just keeps "listening"that's the only thing on the screen... It's up to 40000, I presume that's long enough. .. What's wrong here? Little help please
A Google User
Apr 11, 2014
Yess Try
A Google User
Jan 24, 2014
Stay tuned. The dashboard on this app looks great (love being able to see at a glance HR and HRV numbers). Interest in bio-hacking is growing and the relationship of HRV to health is finally something that can be used practically. Unfortunately for me, this app does not currently connect to a smart BT device (I'm running CM11 - Android 4.4.2 on a Nexus4 - with a Polar H7). I appreciate the fact however that the developer provides a free version of his app so I could test it out. I also contacted the developer and he quickly responded that he is looking into providing BT4.0 support. Best of luck to you Mick!