velocity of 0.1 .03 m/s compared to community walkers with a gait velocity of 0.8 + 0.18 m/s. Table 2-2. Six ambulation categories Ambulation level Physiological walker Limited household walker Unlimited household walker Most-limited community walker Least-limited community walker Community walker Ambulation ability Walks only for exercise or in therapy Requires assist for some walking activities, does walk during some home activities Able to walk for all household activities, has difficulty with stairs and uneven terrain, not able to enter and leave the house independently Able to enter and leave their home independently, is able to ascend and descend curbs, able to manage stairs but with assistance, independent in at least one community activity, but needs assistance with others Independent in stairs, all moderate community activities, and in local stores and uncrowded shopping centers Independent in all home and community activities, can walk with crowds and on uneven terrain, and able to be independent in shopping centers The classification system was condensed to depict three distinct gait velocity based classifications (see Table 2-3). This was necessary due to the similarities in gait speed between the household walkers. A walking speed of less than 0.4 m/s was determined equivalent to severe gait impairments and the household ambulation category. Limited community ambulation equals moderate gait impairments and speeds between 0.4 m/s and 0.8 m/s. Those in the community ambulation category walk over 0.8 m/s and are considered to have mild or limited post-stroke gait impairment. The normal healthy older population has been documented to walk at a gait velocity of 1.33 m/s [165]. Table 2-3. Gait Speed Classification Speed, m/s Impairment Ambulation Ability < 0.4 Severe Household ambulation 0.4-0.8 Moderate Limited Community Ambulation > 0.8 Mild Community Ambulation 1.33 None Normal, Healthy Elderly Population