Only recently have uniform categories of activity been developed by an international ICU rehabilitation group to promote standardization across studies. Perhaps part of this debate centers on an effective measurement tool that is not too burdensome from either an implementation or analysis perspective. The resource-intensive nature of the actiheart may not be cost or resource-intensive. Thus, no single instrument to date currently offers all of the features that would make it fully useful for an inpatient clinical research application. From a clinical perspective, if a device requires downloading data without any immediate in-time user inferface, like a nurse or patient might enjoy using a pedometer-type of instrument, then its use in daily clinical care by nursing, physical therapy or patients may be limited