Subject: RE: low aerobic training The simple answer is that your Garmin is trying to get to slow down. The default HR zones for about 118-136 BPM for someone who is 50 years of based on a Maximum HR of 170 BPM. Having said that, the default zone are notoriously inaccurate for endurance athletes. If you are going to use the zones on your Garmin you should do a Lactate Threshold (LTH) Run Test to accurately determine you, Heart Rate Zones. To get ready for the test You should do a 10-minute warm-up and any stretching or strides that you would do before a race. Then run as hard as you can from 30-minutes. It should feel like a race the whole way. Ten minutes into the test start recording your HR. The average HR for the last 20 minutes of the test will be your LTHR (Lactate Threshold Heart Rate). From there set up your HR zones. Zone 1: 0% - 85% LTHR Zone 2: 85% - 89% LTHR Zone 3: 90% - 94% LTHR Zone 4: 95% - 99% LTHR Zone 5a 100% - 102% LTHR Zone 5b 103% - 106% LTHR Zone 5c 106% and up LTHR Your Aerobic zones are Zone 1 & 2. |