Postural influence on lower limb loading and stability during stand-to-sit movement in hemiplegic stroke patients / 中国康复医学杂志

Objective:To investigate the effect of four different limbs postures on leg loading and stability of stand-to-sit (StandTS) in hemiplegic stroke patients.Method:30 hemiplegic stroke patients and 30 healthy individuals participated in this study.The duration,mean lower limb loading,and sway of the center of gravity (COG) in mediolateral directions (COGX) were measured during StandTS at four postures.Result:There were no significant differences in duration,mean lower limb loading,and COGX between the two arm positions during StandTS in hemiplegic stroke patients (0.05＜P＜0.1).In hemiplegic stroke patients performing StandTS,there were significant differences in duration,lower limb loading,and COGX between the different foot positions (P＜0.05).When hemiplegic stroke patients placed the paretic foot posterior,the weightbearing asymmetry between lower limbs was greatly improved,compared with the asymmetry when the non-paretic foot was posterior (P＜0.05).Furthermore,when the non-paretic foot was posterior,the duration to complete the StandTS movement increased (P＜0.05),and the postural stability during StandTS improved(P＜0.05).There were no significant differences in duration,mean lower limb loading,and COGX among four different limbs positions during StandTS in healthy individuals (0.05＜P＜0.1).Conclusion:Changing the upper limb position did not affect lower limb loading and postural stability during StandTS in stroke patients.However,changing the foot position significantly influenced the lower limb loading and postural stability during StandTS in hemiplegic stroke patients.

Relação entre percepção e ação durante os movimentos de sentar e levantar em indivíduos idosos / The relation between perception and action during the stand-to-sit and sit-to-stand movements in elderly individuals

A proposta deste estudo foi analisar o efeito do envelhecimento nos aspectos perceptivos e motores envolvidos com as ações de sentar e levantar de uma cadeira. Indivíduos jovens e idosos foram filmados enquanto sentavam/levantavam de uma cadeira em sete alturas diferentes do assento. Eles julgaram a dificuldade/facilidade encontrada para sentar e levantar em cada altura do assento. Os idosos exibiram mudanças na estratégia de controle usada para sentar na altura mais baixa do assento e superestimaram o nível de dificuldade/facilidade para realizar as tarefas de sentar e levantar. Em síntese, a percepção de execução fácil da tarefa de sentar pelos idosos não concorda com o grau de dificuldade exibido no desempenho motor na altura mais baixa do assento.

The purpose of this study was to analyze aging effects on the perceptual and motor aspects involved in the sit-to-stand and stand-to-sit actions. Young and older individuals were videotaped while performing those actions on a chair adjusted with seven seat heights. Participants estimated, for each seat height, the difficulty/facility perceived while performing the sit-to-stand and stand-to-sit actions. Older individuals exhibited changes in the control strategy used for sitting at the lowest seat height, and overestimated the degree of difficulty/facility involved in performing both actions. In general, the degree of easiness perceived by older individuals at the lowest seat height disagrees with the degree of difficulty exhibited during the motor performance of this task.