Background: Previous studies discussed the repeatability and variability in plantar pressure measurement, but a few considered different age groups. Here we determine within and between-days repeatability and variability of plantar pressure measurement during gait in participants from different age groups. Method: Plantar pressure was recorded in children, young adults and older adults walking at preferred speed in four non-consecutive days within one week. Data from 10 steps from each foot in each day were analyzed considering the different regions of the foot. Mean and peak plantar pressure and data variability were compared between the steps, foot regions and days. Results: To describe mean and peak pressure during gait in children and adults a single measurement can be enough, but elderly will requires more attention especially concerning peak values. Variability in mean pressure did not differ between age groups, but peak pressure variability differed across foot regions and age groups. Conclusion: One single observation can be used to describe plantar pressure during gait in children and adults. When the interest concerns older people, it might be pertinent to consider more than one day of assessment, especially when looking at peak pressure.
Objetivo: Determinar a variabilidade, a repetibilidade e as assimetrias da pressão plantar na marcha de crianças avaliadas em diferentes dias. Metodologia: Participaram deste estudo 12 crianças voluntárias (6 meninos) com idade média de 10,0±2,0 anos. Elas caminharam descalças em velocidade preferida ao longo de um trajeto de 9 m. A avaliação da marcha foi repetida em 4 dias não consecutivos de uma semana e a pressão plantar foi monitorada em cada um dos dias através de um baropodômetro. Os dados de pressão plantar foram comparados entre as pisadas em cada dia e entre os diferentes dias, considerando a pressão média e o pico de pressão para cada um dos pés. O índice de assimetria foi quantificado e comparado entre os dias. Resultados: As crianças tiveram um padrão consistente para pressão média e pico de pressão plantar. Os índices de assimetria observados foram similares entre os diferentes dias avaliados. Conclusão: A pressão média e o pico de pressão apresentaram valores consistentes em diferentes dias em que crianças são avaliadas, o que inclui similar assimetrias nos diferentes dias.
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