First baseman Todd Helton seems to be improving, although the stomach ailment that landed him in the hospital and on the disabled list Friday remained a mystery 48 hours later. "More a positive vibe because he is feeling better," team trainer Keith Dugger said. Helton is expected to be released from Rose Medical Center after another battery of tests today. Dugger said doctors "haven't officially eliminated anything," but reiterated that Helton's condition isn't considered life-threatening. "I think there is improvement," manager Clint Hurdle said. "More optimism maybe [Sunday] than there was [Saturday]."