RESUMO
Background: Partial body weight support (BWS) systems have been broadly used with treadmills as a strategy for gait training of individuals with gait impairments. Considering that we usually walk on level ground and that BWS is achieved by altering the load on the plantar surface of the foot, it would be important to investigate some ground reaction force (GRF) parameters in healthy individuals walking on level ground with BWS to better implement rehabilitation protocols for individuals with gait impairments. Objective: To describe the effects of body weight unloading on GRF parameters as healthy young adults walked with BWS on level ground. Method: Eighteen healthy young adults (27±4 years old) walked on a walkway, with two force plates embedded in the middle of it, wearing a harness connected to a BWS system, with 0%, 15%, and 30% BWS. Vertical and horizontal peaks and vertical valley of GRF, weight acceptance and push-off rates, and impulse were calculated and compared across the three experimental conditions. Results: Overall, participants walked more slowly with the BWS system on level ground compared to their normal walking speed. As body weight unloading increased, the magnitude of the GRF forces decreased. Conversely, weight acceptance rate was similar among conditions. Conclusions: Different amounts of body weight unloading promote different outputs of GRF parameters, even with the same mean walk speed. The only parameter that was similar among the three experimental conditions was the weight acceptance rate. .
Assuntos
Idoso , Humanos , Masculino , Adenocarcinoma/tratamento farmacológico , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Neoplasias Pulmonares/tratamento farmacológico , Neoplasias Retais/patologia , Adenocarcinoma/secundário , Tolerância a Medicamentos , Floxuridina/administração & dosagem , Neoplasias Pulmonares/secundário , Mitomicina , Mitomicinas/administração & dosagem , Indução de RemissãoRESUMO
Introduction Partial body weight support (BWS) systems have been employed for gait training of children with cerebral palsy (CP). Therefore, it would be important to analyze if the type of walking surface and the amount of body weight unloading over lower limbs change the way these children walk. Objectives Investigate the influence of walking surface and amount of body weight unloading on the spatial temporal characteristics during walking of children with CP. Materials and methods Seven children with spastic CP between four and eight years old and GMFCS (Gross Motor Function Classification System) between I and IV, were videotaped walking with 0%, 15% and 30% of BWS on both dynamic (treadmill) and static (ground level) surfaces. Walking spatial temporal variables were calculated. Results Children walked with similar velocity in all experimental conditions. While stance duration decreased as the percentage of BWS increased, no differences were found for stance and swing periods and cadence. Children walked with longer steps and strides and with faster strides on static surface compared to dynamic surface. Conclusion Children with CP presenting different levels of motor impairment presented some alterations in the spatial temporal walking parameters as they walked with body unloading. However, such alterations might be due mainly to the type of walking surface than the percentage of body weight unloading on lower limbs.
Introdução Sistemas de suporte parcial de peso corporal (SPPC) têm sido utilizados para treinamento do andar de crianças com paralisia cerebral (PC). Sendo assim, seria importante analisar se o tipo de superfície e a quantidade de alívio de peso corporal sobre os membros inferiores interferem na forma como essas crianças andam. Objetivo Investigar a influência do tipo de superfície e da porcentagem de alívio de peso corporal sobre as características espaço-temporais durante o andar de crianças com PC. Materiais e métodos Sete crianças com PC espástica, entre quatro e oito anos de idade, e GMFCS (Gross Motor Function Classification System) entre I e IV, foram filmadas andando com 0%, 15% e 30% de SPPC em superfícies móvel (esteira motorizada) e fixa (chão). Variáveis espaço-temporais do andar foram calculadas. Resultados As crianças andaram com velocidade semelhante em todas as condições experimentais. Enquanto que a duração do período de apoio diminuiu conforme a porcentagem de SPPC aumentou, nenhuma diferença para as fases de apoio e balanço e cadência foi encontrada. As crianças andaram com passos e passadas mais longos e passadas mais rápidas na superfície fixa do que na superfície móvel. Conclusão Crianças com PC com diferentes níveis de acometimento motor apresentaram algumas alterações nos parâmetros espaço-temporais durante o andar com alívio de peso corporal em superfícies móvel e fixa. Entretanto, tais alterações podem ser atribuídas principalmente ao tipo de superfície em que as crianças andam do que às porcentagens de alívio de peso corporal proporcionadas aos membros inferiores.