First up is to calculate my minimum and maximum heart rate. The minimum is a fairly simple task, taking my heart rate before I get out of bed in the morning. I can keep doing this and keep a rolling average. At the moment it sits at around 52 bpm. Calculating the max heart rate is a little more complex though.
There are lots of formulae floating around the Internet, from the very simple 220 - Age through to the more complex 210 - (Age/2) - (0.05 * Weight (lb)). Here is a quick summary of my scores:
Calculation | MHR |
Simple Age Based | 184.0 |
BikeRadar | 187.2 |
Miller | 186.4 |
Londeree | 180.7 |
Jackson | 182.8 |
Whyte | 182.2 |
Combined | 181.4 |
This gives me an average of around 183, so lets use this number. Knowing the max and the min I can now start to work out the training zones, and again it gets complex. A fairly rough guide is to use 10% wide zones, so 60% to 70% is the weight loss and endurance zone. 70% to 80% is the cardio zone. However, British Cycling use a more complex zone setup (from Bike Radar):
Zone 1 (60-65% of maximum heart rate): For long, easy rides, to improve the combustion and storage of fats.
Zone 2 (65-75% of MHR): The basic base training zone. Longish rides of medium stress.
Zone 3 (75-82% of MHR): For development of aerobic capacity and endurance with moderate volume at very controlled intensity.
Zone 4 (82-89% of MHR): For simulating pace when tapering for a race.
Zone 5 (89-94% of MHR): For raising anaerobic threshold. Good sessions for 10- and 25-mile time-trials.
Zone 6 (94-100% of MHR): For high-intensity interval training to increase maximum power and speed
Zone 2 (65-75% of MHR): The basic base training zone. Longish rides of medium stress.
Zone 3 (75-82% of MHR): For development of aerobic capacity and endurance with moderate volume at very controlled intensity.
Zone 4 (82-89% of MHR): For simulating pace when tapering for a race.
Zone 5 (89-94% of MHR): For raising anaerobic threshold. Good sessions for 10- and 25-mile time-trials.
Zone 6 (94-100% of MHR): For high-intensity interval training to increase maximum power and speed
Plugging in all of the numbers then gives me a very rough guide to my training zones
Zone | HR min | HR max |
Z1 | 110 | 119 |
Z2 | 119 | 138 |
Z3 | 138 | 150 |
Z4 | 150 | 163 |
Z5 | 163 | 173 |
Z6 | 173 | 184 |
I know from experience that keeping it below 120 bpm on the bike is a pretty easy ride so this feels about right. With these zones in place I can now think about applying them to my training, at least in the early days while I get a feel for them, and for that I need a heart rate monitor.
I already own an ANT+ HRM so this would be the obvious choice, except Strava doesn't support ANT+ on Android ( I know, how stupid, but check the forums and feel the anger of the ANT fans). I also have an Endomondo Pro license, but as this is different to the subscription based Premium license I don't get so many nice features. I also find Endomondo tends to wander off track leading to inaccurate results.
I've looked at various Garmin devices but they would all put a serious dent in the £1000 budget so I'm going to have to come up with some combination of monitoring. If you see somebody rolling past with two phones, a cycle computer and a calculator it is probably me. Don't try to stop me, I'll be in the zone.