Actually no. The holter monitor is a fairly passive investigation, where you pace yourself through the day. At the time I was still able to walk about a hundred metres at a time before I needed to stop and rest for a while and I was able to do this while wearing the monitor. That was my mistake. It didn't find any evidence of a problem at the time and the cardiac ward wouldn't allow me to perform the cardiac stress test because I was out of breath from the moment they began to speed up the machine. For myself, it wasn't until I finally performed the 6 minute monitored walk as part of pulmonary function testing that the problem became apparent. Unlike the holter monitor I treated the test as a de facto opportunity to perform the cardiac stress test. The result was that the test had to be discontinued due to my heart rate reaching dangerous levels because I wasn't trying to pace myself but kept pushing myself to keep walking no matter how out of breath I became.