Quick start guide of the Heart Rate Variability Logger app, an app that lets you record, plot and export time and frequency domain Heart Rate Variability Features (includes experience sampling, rr-interval correction, comparison between recordings, activity monitoring & step counting, location tracking). iPhone app: https://itunes.apple.com/us/app/heart-rate-variability-logger/id683984776?ls=1&mt=8 android app: https://play.google.com/store/apps/details?id=ma.hrvlogger&hl=en More information and implementation details can be found here: http://www.marcoaltini.com/2/post/2013/12/heart-rate-variability-logger-app-details.html

1. Heart Rate Variability Logger
V4.2 Quick Start Guide
@marco_alt

2. • Extracts, plots, stores and exports heart rate, rr-intervals, time and
frequency domain heart rate variability features
(AVNN, SDNN, rMSSD, pNN50, LF, HF, LF/HF)
• Configurable experience sampling for events annotation
• Comparison between recordings lets you get a better
understanding of autonomic regulation and
sympathetic/parasympathetic activity under different contexts in a
glance
• Step counter or accelerometer derived motion intensity for user
context (step counter only for iPhones 5S)
• Configurable time window for features computation (choose
between 30 seconds, 1, 2 or 5 minutes)
• Location tracking (GSM/WiFI or GPS based)
• RR-intervals correction can be enabled to prevent ectopic beats
or artifacts from affecting HRV features
• Data export using iTunes or Dropbox
• Tested for recordings longer than 24 hours

3. Select RR-interval
correction parameters
to remove artifacts
due to motion or
ectopic beats
Configure your
preferred time
window, features will
be computed
accordingly
Link to Dropbox or
use iTunes to
download your data

4. By enabling
experience
sampling, events will
be automatically
triggered at
configurable time
intervals
You can also add
some randomness to
avoid receiving events
at constant time
intervals, in this case
enable 'add
randomness' as well.
There will be a shift
in time of maximum
5% more or 5% less
than the time
specified as 'time
interval’

5. Activity tracking can
be used to add
context to your
recordings (motion
intensity for iphons
prior to the 5S, and
step counter for the
5S)
Additional context
can be acquired
enabling location
tracking. GSM and
WiFi networks will be
used if high accuracy
location is
disabled, otherwise
the app will use GPS
and therefore drain
more battery
power, but provide
more accurate and
frequent location
updates.

6. connect
Connect to your
Bluetooth SMART
Heart Rate Monitor

7. record
HRV Logger will
start receiving your
Heart Rate
Next, start a
recording
heart rate

8. stop
log event
During the
recording, you can
log relevant events

9. Event annotations

10. The real-time view
shows the HR and RR
data received from the
sensor, as well as the
computed features

11. RR-intervals can be
corrected
automatically for
artifacts and ectopic
beats

12. Features are
computed at userdefined windows
(30 seconds to 5
minutes)
HRV Features:
- AVNN
- SDNN
- rMSSD
- pNN50
- LF
- HF
- LF/HF
Accelerometer
Features:
- Motion intensity

13. On top of HRV
features, the
accelerometer is
used to determine
motion intensity
and give an
indication of the
user activity
Iphones 5S will
display actual steps
taken

14. Steps

15. Browse your history
of recordings

16. Export your data

17. Select export
modality

18. Filter data based on
configurable
thresholds

19. Recordings
comparisons
Select up to three
recordings to
compare
get a better
understanding of
autonomic
regulation and
sympathetic/parasy
mpathetic activity
under different
contexts in a glance

21. Data format
• Four csv files
• HR every second as received from the sensor
• RR-intervals after correction
• Events annotated + event type and text
• Features (AVNN, SDNN, rMSSD, pNN50, LF, HF,
LF/HF, steps, latitude, longitude)
Features example:

22. Questions?
See link below
@marco_alt