thanks for noticing i would just like to chime in and repeat how consistantly this takes place. as per eric, i set 3 different profiles in my pump (i use Medtronic, not OPod), so i can switch settings w/out having to set daily TBs. as the week progresses, and if i have been swimming every day, i have a gradual ISF and less Basal. also, anything i consume right after my swim, i need less than 50% of units of insulin than at any other time of my day/night.