Article

We sought to characterize the percent (PT) of the phases of a gait cycle (GC) as
velocity changes to establish norms for pathological gait characteristics with
higher resolution technology. Ninety five healthy subjects (49 males and 46
females with age 34.9 +/- 11.8 yrs, body weight 64.0 +/- 11.7 kg and BMI 23.5 +/-
3.6) were enrolled and walked comfortably on a 10-m walkway at self-selected
slower, normal, and faster velocities. Walking was recorded with a high speed
camera (250 frames per second) and the eight phases of a GC were determined by
examination of individual frames for each subject. The correlation coefficients
between the mean PT of the phases of the three velocities gaits and PT defined by
previous publications were all greater than 0.99. The correlation coefficient
between velocity and PT of gait phases is -0.83 for loading response (LR), -0.75
for mid stance (MSt), and -0.84 for pre-swing (PSw). While the PT of the phases
of three velocities from this study are highly correlated with PT described by
Dr. Jacquenlin Perry decades ago, actual PT of each phase varied amongst these
individuals with the largest coefficient variation of 24.31% for IC with slower
velocity. From slower to faster walk, the mean PT of MSt diminished from 35.30%
to 25.33%. High resolution recording revealed ambiguity of some gait phase
definitions, and these data may benefit GC characterization of normal and
pathological gait in clinical practice. The study results indicate that one
should consider individual variations and walking velocity when evaluating gaits
of subjects using standard gait phase classification.
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Langue : ANGLAIS