Start lifting more now, don't wait until goal.
I'm a shorty, too - and this last bit of weight is hard to get off. I eat around 1400-1500 per day.
I do intense strength train 3x per week, and cardio other days.
It wouldn't hurt you to multiple your BMR by 1.4 and try eating that for a couple of weeks to see what happens.
Also - on your calorie cycling, I think 1000 one day and 2000 another is too wide a swing (IMHO). Try more for 1200 one day and 1700 another day. If you are lifting and doing cardio, 1000 is way too little.
As far as how long to exercise for, there is a lot of conflicting info out there. As long as you get the total time in - it's better to get in six 10 minute walks than no walks at all. How much glucose is in your blood is really dependent upon what you eat, how tolerant you are to insulin, and how long before your exercise you have eaten.
Now glycogen, on the other hand - I believe your muscles store 300 calories worth at any given time, and that is used as energy during your workouts. I read that in "You On A Diet", so you can check that figure just to be sure.
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