Effects of a cognitive dual task on variability and local dynamic stability in sustained repetitive arm movements using principal component analysis: a pilot study.

Motor task versus motor + cognitive task With respect to endpoint variability, a statistical trend was observed in VE m which decreased in the M + C [9.34 (± 3.22) mm] compared to the M [11.01 (± 3.78) mm] trials [ t (11) = 1.83, P = 0.095, d = 0.48].

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