Hi Maria- I think the theory behind the varied workout rates is that at lower rates you burn more fat and less carbs, thus helping with weight loss by burning your stored fat and using less carbs that are in your system already. For example, the UK C2 site says that at UT2 you're burning 60% fat/ 40% carbs on up to Max HR you're burning 0% fat/ 100% carbs. I can't find the chart right now- have you seen it? For those of us losing weight, the former is obviously the better choice.
As far as how you're training right now, it totally depends on your goals. For me personally, I need to do two things: 1) Train for OTW fall head races (5K) and 2) Lose weight. The goals aren't mutually exclusive, but I do spend a lot more time in the higher intensity ranges now because of the race training rather than the lower ones. (I am focusing my off-water time on L4/ UT2 stuff.) So, what are you trying to accomplish? If it's purely for weight loss, then yeah, you should slow down and lengthen up your workouts. Mark's suggestions are on the money. A year ago, my UT2 type stuff was at 2:45ish (slow!), and now I can stay at about 2:20 and keep in range at that 18-20 spm and keep up a conversation. You'll find that as your fitness level rises, your times for UT2 splits will drop. These are by far my favorite kinds of workouts (closely followed by pyramids).
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- just get in the zone and stay there. Watch a movie, listen to a book on tape, etc. You can also use something like the Wolverine plan to generate some more 'fun' UT2 workouts (called L4's) that vary stroke rating and splits, just to keep it interesting. (I'm a person who likes playing the mind math games with the PM).
I just bought a heart rate monitor today in order to help me track WW points from my OTW training (Xeno's recommendation). I'm not losing consistenly, and I think that's related to not enough food, rather than the opposite (getting into that starvation mode). I'd love to hear what you think if you get one. I'll try to check back with you in a week or so and let you know what I think about the HR monitor. I'm really curious to see what I'm actually doing OTW (on the erg, I have a pretty good idea, but in the boat I'm pretty distracted keeping up with technique, listening to the cox, etc. and don't really notice how hard/slow I'm going).
I've been long winded enough- let us know what you discover, okay?
Julie in CO