ISO and sports pictures are a bit of a conundrum. Cranking up the ISO is necessary even in good lighting (though 400 is certainly more manageable than 1600), but if a shot is good, things like noise tend to be ignored more than they would be in an ordinary shot. There's an inherent drama and action in sports that allows the photographer to let some of the technical stuff slide. Shutter speed and focus become more important than the other stuff.
Case in point: I sold
this image to one of my professors last semester (a color version) and he called it "the best sports shot in Columbus this year." I'm not sure I would go so far as to call it the
best but I certainly like it too. Technically it isn't even a very good shot though, the noise is atrocious, but the content overcomes that.
That's probably way more text than anyone wants to read. Basically, what I'm saying is not to worry about the ISO and just go for shots that punch with content. The picture you posted exemplifies good sports photography.