Ajustes posturais em individuos neurologicamente normais e em portadores da Sindrome de Down na gangorra : efeito do treino

AUTOR(ES)

Regiane Luz Carvalho

DATA DE PUBLICAÇÃO

2000

RESUMO

The purpose of this study was to investigate the postural adjustments and the effects of practice during balance on seesaw. Subjects. Six individuals with Down syndrome and six neurological normal individuals (NN) took part of this study. Methods. The individuals were trained to balance on one seesaw and were tested before and after practice on nine different seesaws. We recorded the LED marks that were placed on the center or hip, knee and ankle joints and the EMG activities of the some leg and trunk muscles. Results. Neurological Normal individuals maintained balance mainly using ankle movements, and these movements were correlated with the displacement of the center of pressure. They demonstrated an alternated pattern of ankle agonist and antagonist muscles activities and were able to moduIate the amount of balance based on the mechanical dernand of each io, tenns or degree of stability. The order of this alternation was io the opposite direction of the stretched muscle. For cxample, when the. ankle was moved into dorsal fIexion the gastrocnemium was stretched but the anterior tibialis was activated. Training did not affect t.he balance on seesaw. Individuals with Down syndrome demonstrated a difficulty to corre1ate the joints movements with center of pressure displacement. Contrary to NN, the Down syndrome individuals did not alternated the EMG activities. They co-activated the agonist and antagonist ankle muscles even for easy conditions and were unable to modulated the answer with mechanical demand of the task. Training increased the ,possibilities of these individuals balance on seesaw, but clid not change their postural strategy. Conclusion and Discussion. This study confirm the idea that the balance on seesaw i8 achieved mainly by changing the ankle joint (Ivanenko et aL, 1997) and show that the NN individuals use a strategy similar to the inverted pendulum. First,. we observed that these individuals inhibited the stretching muscle using perhaps a suprao ó segmental projection. Second, the training did not affect the balance strategy for both groups. Third, too Down syndrome used a different strategy compared with normal individuals and their strategy was enough to assure balance. Contrary to the others studies (A1meida, et al., 1994) they- did not change their muscle and cinematic strategy of balance after training. it?s seems that the strategy that they use is an adaptive response to deficits on postural control If this is an adaptive response the Physical Therapist should try changing these strategy? Our study supports the idea that the rehabilitation should emphasize the motor function and not the movement patter However, before embarking in a new therapeutic tractate; new studies are need to show if the adaptive response used by the individuals with Down syndrome balance on seesaw can be changed without any detriment of their ability to balance on seesaw

ASSUNTO(S)

treinamento (atletismo) postura humana sindrome de down

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