Serial changes in gait cadence and acceleration during daily activities. Examples of patients who showed no fluctuation in the cadence. Left ordinate: the cadence (black continuous line and symbols), right ordinate: acceleration (red continuous line and symbols), abscissa: time, black dotted line: mean cadence ± 1SD of normal subjects, and red dotted line: mean acceleration − 2SD of normal subjects. Fluctuations in acceleration were small in the patient shown in (a), and large in the patient shown in (b).