Use it and improve it or lose it: interactions between arm function and use in humans post-stroke
Yukikazu Hidaka, Cheol E Han, Steven L Wolf, Carolee J Winstein, Nicolas Schweighofer, Yukikazu Hidaka, Cheol E Han, Steven L Wolf, Carolee J Winstein, Nicolas Schweighofer
Abstract
"Use it and improve it, or lose it" is one of the axioms of motor therapy after stroke. There is, however, little understanding of the interactions between arm function and use in humans post-stroke. Here, we explored putative non-linear interactions between upper extremity function and use by developing a first-order dynamical model of stroke recovery with longitudinal data from participants receiving constraint induced movement therapy (CIMT) in the EXCITE clinical trial. Using a Bayesian regression framework, we systematically compared this model with competitive models that included, or not, interactions between function and use. Model comparisons showed that the model with the predicted interactions between arm function and use was the best fitting model. Furthermore, by comparing the model parameters before and after CIMT intervention in participants receiving the intervention one year after randomization, we found that therapy increased the parameter that controls the effect of arm function on arm use. Increase in this parameter, which can be thought of as the confidence to use the arm for a given level of function, lead to increase in spontaneous use after therapy compared to before therapy.
Conflict of interest statement
The authors have declared that no competing interests exist.
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References
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