Proficiency and manual asymmetry in young people with trisomy 21 in two manual dexterity tasks
Objective: To evaluate the proficiency and manual asymmetry of individuals with Trisomy 21 (T21) in two manual dexterity tests: global and fine. Methods: Participants were 21 individuals with T21 between 17 and 45 years, 13 right-handed, residents in the city of Porto, Portugal. For evaluating the overall handedness (DMG) we used the Minnesota Manual Dexterity Test (placement version) and for fine manual dexterity (DMF), the Purdue Pegboard.
Results: In DMF test statistically significant differences were not observed (t (20) = 1.23, p = 0.233) between the hands, but in the DMG test the difference between hands reach statistical significance (t (20) = 3.128, p = 0.005), not being the preferred hand (145.22 sec ± 53.42) faster than the preferred hand (156.16 sec ± 59.99). The Asymmetry Index Manual for each task was conducted, however, did not reveal statistically significant (t (20) = - 1.003, p = 0.328). Conclusion: The best proficiency with the hand not preferred in DMG task may be related to peculiar characteristics to this population, such as difficulties in selective motor, which impoverish the performance for either hand, or with other factors to be investigated. The data suggest that the task performed by DMG and DMF and people with T21 are not influenced by manual preference.
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