Do you ever "comb your carpet"?

Yes, this is a dirty question but not in the sense you think. I’m talking about vacuuming. I have a friend who vacuums her carpet from time to time on the low (bare floor) setting and calls it “combing” her carpet. She claims it runs the bristles on her vacuum through the pile of her carpet (hence, combing) and puffs the carpet back up when it starts to get flat. Aside from probably being hard on the vacuum engine, would this really work? Has anyone heard of this or does anyone do it? I’m wondering if there are tricks out there to “puff up” high-pile carpet in high-traffic areas.