Reach-to-grasp co-ordination in the paretic limbs of individuals with stroke: insight from a barrier paradigm

Runnarong, N.; Tretriluxana, J.; Hiengkaew, V.; Vachalathiti, R.

Journal of the Medical Association of Thailand 97(Suppl 7): S84-S88


ISSN/ISBN: 0125-2208
PMID: 25141534
Document Number: 14530
Reach and grasp components must be co-ordinated to preserve the optimal reach-to-grasp performance. However conflicting results regarding the deficit in reach-to-grasp co-ordination has been reported in the paretic hand of individuals after stroke. Additionally, investigations have not been undertaken to study more challenging task constraints to induce the impairment of reach-to-grasp co-ordination. This study aimed to compare reach-to-grasp co-ordination while avoiding an obstacle in the paretic hand of individuals after stroke with matched non-disabled adults. Twenty-four participants having mild severity of upper extremity impairment were recruited with an equal number of non-disabled adults. Kinematic reach-to-grasp movements with obstacle avoidance were analyzed. Reach-to-grasp co-ordination was quantified using cross-correlation analysis: maximum correlation coefficient represented the spatial aspect and the time lag represented the temporal aspects. Individuals after stroke showed a significant disturbance in the temporal aspect of reach-to-grasp co-ordination, but not the spatial aspect as compared with non-disabled adults. Among participants, after stroke reach-to-grasp co-ordination was delayed in the temporal aspect of reach-to-grasp with obstacle avoidance but preserved in the spatial aspect. Specific methods to assess reach-to-grasp co-ordination and to treat the time delay to improve co-ordination should be considered in individuals after stroke.

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