big fellow wrote:
yeah that sounds way, way too high for base training to me as well. once you're hitting 90% max HR you're close to, if not already in your anaerobic zone
John - do you have the name of the studies Dr. Croggan? would be interesting to read them.
For me, maintaining an effort at 90% max heart rate for 45 minutes is not difficult and is completely aerobic. It takes some concentration but the real issue when training at this level indoors is cooling. In addition, many find this type of workout difficult more due to technique than ability: trying to get to the target heart rate level too fast. I have an isopower data file of a very hard effort under perfect (cool) conditions: for one hour the power is essentially constant at my max hour power, but my heart rate did not hit 90% until 25 minutes into the race (a hillclimb). Here, my average heart rate for 59 minutes was 89% of max. The key then is using HR as a guide is to ramp up slowly.
If you want more information on this topic, go to the Topica wattage forum and do a search on “sweet spot.”
PS Aerobic/Anaerobic are other terms, like LT I try to avoid, just like "oxygen debt" because historical they have been misused. Simply because one exceeds "LT" does not mean one has switched to anaerobic mechanisms. For example, even the 4 K pursuit, an all-out effort of 4 minutes, is largely aerobic, with the anaerobic component only at the start.