Sarah Gerhardt at Mavericks (IMAGE) University of California - Santa Cruz Caption This is UC Santa Cruz alumna Sarah Gerhardt surfing at Mavericks. Sarah and husband Mike Gerhardt wore heart rate monitors during a session at Mavericks, enabling UCSC biologist Terrie Williams to record one of the highest prolonged heart-rate levels ever recorded. Their heart rates averaged 90 percent of maximum (as measured in treadmill tests) for hours at a time. Credit Frank Quirarte, www.mavsurfer.com Usage Restrictions For use only with news coverage of this research. Include photographer's name and web site in credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.