The system I use combines the Rhythm+ armband monitor, with the Endomondo app for my iPhone. [Edit Jan 2015 I now use a Mio Alpha HR monitor, which also "talks" to Endomondo.]
Heart Rate Monitor: Rhythm+ by SCOSCHE
The monitor "optically measures blood flow" - which basically means it uses lights. The promotional material says it is for use on the forearm but I have also strapped it to my ankle successfully.
It charges via a handy docking station, so no expensive batteries. The blue dots are my addition so that I put it in the right way around!
The device is MUCH more comfortable than a chest strap monitor, and also seems to transmit much more reliably. In fact provided there are no solid walls in the way, it can transmit across quite a distance.
The thing that felt strange at first, was that the monitor doesn't have it's own readout. However, it sends the data via bluetooth to a variety of phone apps. I chose Endomondo.
Phone App: Endomondo
Phone App: Endomondo
Once monitor and app are all set up to communicate with each other, this is very simple to use. And it is not just a HR monitor, you can also link it to your phone's GPS and so see where you've been on a map and track your speed and distance!
I mostly just use the HR feature and the read out looks like this.
I mostly just use the HR feature and the read out looks like this.
The slider at the bottom appears so that the display continues, but the screen is locked.
After finishing the "session" a summary can be accessed:
And also a time-line, showing how HR varied through out the activity:
There is also a chart showing how long was spent in each "zone". I edited these zones online so that the the boundaries between the zones are: 60, 80, 100, 120 and 140.
Here you can see I spent almost 3 minutes above 120 bpm.
The phone data is only available immediately after the session. However the data is transferred to your online Endomondo account via Wifi. All the sessions are then stored for later analysis.
The graph in particular is easier to interpret online.
The phone data is only available immediately after the session. However the data is transferred to your online Endomondo account via Wifi. All the sessions are then stored for later analysis.
The graph in particular is easier to interpret online.

There is a facility to tag and name each session. I tend not to bother, but rather just use the system for feed back whilst active, and then when I review things later that day on the computer.
Anyway, it's all very interesting, and I think monitoring my HR is definitely helping me understand where I spike my HR and therefore what activities I need to be careful with....
..... more thoughts on that later.
In the mean time I hope others have found this review useful, and might be encouraged to also start monitoring their activities.
It's not going to "cure" ME, but hopefully as a sort of budgeting tool, this can prevent me from becoming "over-drawn" on my energy account and incurring a high-interest payback later.
PS [Jan 2015]
I now use a Mio Alpha HR monitor that has some advantages over the Rhythym+
1. It has a read out like a watch
2. It can run all day on an overnight charge
3. It has an alarm function that beeps when my HR goes too high.
It can also "talk" with Endomondo on my phone so that I still get my pretty graphs!
Sue Jackson describes her Mio Alpha in a blog post here
Some more of my Heart Rate Monitoring posts can be found here: Just ME INDEX
Anyway, it's all very interesting, and I think monitoring my HR is definitely helping me understand where I spike my HR and therefore what activities I need to be careful with....
..... more thoughts on that later.
In the mean time I hope others have found this review useful, and might be encouraged to also start monitoring their activities.
It's not going to "cure" ME, but hopefully as a sort of budgeting tool, this can prevent me from becoming "over-drawn" on my energy account and incurring a high-interest payback later.
PS [Jan 2015]
I now use a Mio Alpha HR monitor that has some advantages over the Rhythym+
1. It has a read out like a watch
2. It can run all day on an overnight charge
3. It has an alarm function that beeps when my HR goes too high.
It can also "talk" with Endomondo on my phone so that I still get my pretty graphs!
Sue Jackson describes her Mio Alpha in a blog post here
Some more of my Heart Rate Monitoring posts can be found here: Just ME INDEX
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Other posts on Monitoring Activities for Pacing:
Monitoring ME: Part 1 - Fitbit Sept 2014
A few notes on using a HR Monitor for Pacing Feb 2014
Monitoring ME: Part 1 - Fitbit Sept 2014
A few notes on using a HR Monitor for Pacing Feb 2014
Pacing for M.E. - And Using a Fitbit Dec 2013