[Palmar force in Down syndrome people. Analysis of involved muscles]

To associate hipotony with grip strength in palmar prehension seeking to indicate parameters and a scale of force for bearers of the Down's Syndrome, once there is a growing increase of the longevity in that population and a lack of works, as well as to identify through literature revision and an anatomic and kinesiologic analysis of the muscles involved in this movement.

Transversal analytic study that had the participation of 138 individuals, distributed in two groups: group of study (GE) = 28 (Down Syndrome's bearers) and the group control (GC) = 110 (normal individuals). The instrument used was the JAMAR dynamometer.

It was verified grip strength significantly smaller for the group GE in relation to the group GC.

men has a prevalence palmar prehension grip strength in relation to women; it was verified a significant deficit of the palmar prehension grip strength in the group GE when compared with the group GC; the obtained results should be considered an indicative of force to rehabilitate the hand function in individuals with Down's Syndrome; it should be taken in consideration the hand's characteristics of the Down's Syndrome bearer, because perhaps they present better results for grip strength with the dynamometer in the position 1; the principal muscles involved in the movement are: long flexor of the thumb; tenars muscles (opponent of the thumb, adductor of the thumb and short flexor of the thumb); hypotenars muscles (short flexor of the minimum finger); superficial flexor of the fingers; deep flexor of the fingers and the 4 lumbrical.