Article

The purpose of this study was to examine the effects of obesity on dynamic
plantar pressure distribution during walking for prepubescent children. A
footscan((R)) plantar pressure plate system was used to collect the gait data.
Fifty obese prepubescent children and fifty non-obese prepubescent children
walked across the plate at preferred speed while barefoot. SPSS11.5 was used for
analysis and significance is defined as p<0.05. Obese subjects had longer
midstance duration (p=0.004) and shorter propulsion duration (p=0.047) compared
to non-obese subjects. The peak pressures under the metatarsal heads II-V,
midfoot and heel lateral (p=0.004, p=0.03, p=0.004) were significantly higher for
obese subjects. The time to peak pressures under the toes II-V, the metatarsal
heads IV, V and midfoot (p=0.008, p=0.009, p=0.01, p=0.006), and pressure rate
under the heel medial and lateral heel (p=0.03, p=0.009) were also significantly
higher. In addition, the arch index for the left foot (p=0.01), the left and
right foot axis angle (p=0.027, p=0.03) were significant larger among obese
subjects. We also found that obese subjects had significantly higher relative
regional impulses of contact with the plate at the midfoot of left foot (p=0.01)
and the forefoot of right foot (p=0.047). There were also differences in foot
balance during the midstance and propulsion phase (p=0.0004, p=0.03) and in
pronation extent during midstance and propulsion phases between left and right
foot in the obese group (p=0.03, p=0.01). In conclusion, the obese children have
weaker walking stability with flatter foot pattern, the larger foot axis angle
and dynamic plantar pressure distribution changes compared to non-obese children.
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