Veronica, if you kept the reps/weights you used in entering the 1RMs, you could just add 12 pounds to the weight and re-compute. That will give you the most accurate results.
I ran a test to see how much difference it would make in a situation where you thought you were lifting 100 pounds for 8 reps, but you were actually lifting 112 pounds for 8 reps, to see how that affected your 1RM. And better check my math, because I haven't had my coffee this morning and that can be dangerous!!!
But this is what I think would happen, using a 1RM calculator I have in a strength recording program:
Predicted1RM = 124.6 (based on lifting 100 pounds 8 reps)
Actual1RM = 139.5 (based on lifting 112 pounds 8 reps)
In Meso1 we do 60 percent of our 1RMs, and you'd end up doing this if you just went with your original estimates and ignored the weight of the bar:
lift = 0.6* 124.6 + 12 = 86.8
But what you want is this:
lift = 0.6*139.5 = 83.8
So, you'd tend to start out a little heavy on all of your barbell lifts because you are adding in the 12 pounds without it being adjusted downward by the rep percentage, and also, you would not realize how strong you actually are. You could just drop off a few pounds when you try the lift, and adjust the workout card after the first week. Most of us end up tweaking our numbers a little anyway. And you might find that it is a nice challenge to have the weights juuussst a little heavier
But personally I find the larger 1RMs to be very motivating and so I'd be one who would go back and re-enter all of the scores with barbells. More fun to think you can lift almost 140 pounds and to make the meso 1 lift, than to think you can lift almost 125 pounds and perhaps not make the meso 1 lift!
Edited to add: I assumed that the workout manager is really doing a 60 percent computation as it says on the sheets and not computing a 15RM; the numbers are a little different.
