Felipe Massa admitted to having a sore neck after two days of testing this week at Mugello.
The Brazilian, who missed most of the second half of the 2009 season following his Budapest accident, drove a total of 90 laps in a two-year-old F2007 fitted with demonstration tyres.
"Even though I trained a lot over the last months, certain muscles important for driving were a bit sleepy," he said in an AFP news report before returning home to Sao Paulo.
"I had a bit of pain in my neck, especially on the fast corners which make this one of the toughest tracks. As for the rest I felt good and felt no difference from before the accident," Massa, 28, added.