What does a network admin see when you use Google Reader?

I roll through a lot of my blogs via Google Reader at work. Most of what I look at is related to my work, some of it isn’t. If my network guys took an interest in me, what would they see? A lot of time in Google Reader, or every blog that Google Reader is set to tap? If they can see everything, is there a way to prevent that? Short of setting up a proxy server (though not ruled out as an option)... Thanks!