Do Fibro pains come on from doing lightweight activities more than from heavy activities? It would be very difficult to know the difference, since we probably use the small muscles along with the larger muscles, for both light and heavy loads, so it might just feel like the big ones hurt but really it is the small ones. Example: I was carrying a small camp chair to the back yard, and my arm got tired and painfull right away, as usual, but instead of stopping to rest I hoisted the chair up high and managed to finish the task. ["latent onset of pain" did occur of course, and it still hurts between my shoulder blades now] Some of the research by Dr. Alan Light, and others, says things such as: ".... the average duration of the differential activations significantly longer in fibromyalgia compared with controls at the two lowest load levels (0-1 Kg) (p<0.04), but not at the two highest load levels (2 and 4 Kg). " Or maybe it is not so simple as I want it to be. Here is another quote that suggests that different parts within muscles are acting differently, so maybe it is just one part of each muscle that hurts, but doing light load tasks could still be what brings it on - Quote #2: "duration of the differential activation between regions within a single muscle" If this is true, it would be earth shattering for Fibro research, and possibly could lead to more accurate and definite diagnosis. Is he onto something here? Does anyone understand what I am trying to say???