Precision-Dependent Changes in Motor Variability During Sustained Bimanual Reaching

8 posts back to Dec. 2011 on bimanual that your doctor and therapists should have already set up a stroke protocol for your recovery. But I bet they have done nothing on this. 

Precision-Dependent Changes in Motor Variability During Sustained Bimanual Reaching 

Alessia Longo ^*1 and Ruud Meulenbroek ^*1Affiliations¹Radboud University

*Longo and Meulenbroek are with the Donders Institute for Brain, Cognition and Behaviour, Radboud University, Nijmegen, The Netherlands.

Address author correspondence to Alessia Longo at a.longo@donders.ru.nl.

Volume: 22 Issue: 1 Pages: 28-44

https://doi.org/10.1123/mc.2016-0013

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Movement variability of the upper limb was investigated using a bimanual Fitts’ task. Participants tapped rhythmically between target-pairs of different index of difficulties for three intervals of 20 min each. We studied the effects of index of difficulties and time-on-task on movement time, end-point variability, approximate entropy, and standard deviation of the relative phase. Lower index of difficulties and time-on-task caused decreasing movement time and increasing end-point variability. Moreover, standard deviation of the relative phase and approximate entropy moderately increased. By looking into the long-term effects of a sustained bimanual Fitts’ task, this is the first time such movement variability increase is demonstrated in multiple variability indices. The relevance of the findings for future studies on work-related musculoskeletal disorders is being discussed.