<p>CHICAGO (AP) — Injuries from zip line accidents have soared along with the popularity of an activity that hurtles riders through the air, sometimes at dizzying heights above ground, a study of U.S. emergency room data shows.</p>
<p>Over 16 years, nearly 17,000 people were treated for zip line-related injuries including broken bones, cuts and sprains; most occurred in the last four years of the 1997-2012 study. It's the first national look at zip line injuries and highlights a need for better regulation and uniform safety standards, the researchers say.</p>