Kinematic parameters obtained with the ArmeoSpring for upper-limb assessment after stroke: a reliability and learning ef

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RESEARCH

Kinematic parameters obtained with the ArmeoSpring for upper‑limb assessment after stroke: a reliability and learning effect study for guiding parameter use Nabila Brihmat1, Isabelle Loubinoux1, Evelyne Castel‑Lacanal1,2, Philippe Marque1,2 and David Gasq1,3,4*

Abstract  Background:  After stroke, kinematic measures obtained with non-robotic and robotic devices are highly recom‑ mended to precisely quantify the sensorimotor impairments of the upper-extremity and select the most relevant therapeutic strategies. Although the ArmeoSpring exoskeleton has demonstrated its effectiveness in stroke motor rehabilitation, its interest as an assessment tool has not been sufficiently documented. The aim of this study was to investigate the psychometric properties of selected kinematic parameters obtained with the ArmeoSpring in poststroke patients. Methods:  This study involved 30 post-stroke patients (mean age = 54.5 ± 16.4 years; time poststroke = 14.7 ± 26.7 weeks; Upper-Extremity Fugl-Meyer Score (UE-FMS) = 40.7 ± 14.5/66) who participated in 3 assessment sessions, each consisting of 10 repetitions of the ‘horizontal catch’ exercise. Five kinematic parameters (task and movement time, hand path ratio, peak velocity, number of peak velocity) and a global Score were computed from raw ArmeoSpring’ data. Learning effect and retention were analyzed using a 2-way repeated-measures ANOVA, and reliability was investigated using the intra-class correlation coefficient (ICC) and minimal detectable change (MDC). Results:  We observed significant inter- and intra-session learning effects for most parameters except peak velocity. The measures performed in sessions 2 and 3 were significantly different from those of session 1. No additional signifi‑ cant difference was observed after the first 6 trials of each session and successful retention was also highlighted for all the parameters. Relative reliability was moderate to excellent for all the parameters, and MDC values expressed in percentage ranged from 42.6 to 102.8%. Conclusions:  After a familiarization session, the ArmeoSpring can be used to reliably and sensitively assess motor impairment and intervention effects on motor learning processes after a stroke. Trial registration The study was approved by the local hospital ethics committee in September 2016 and was regis‑ tered under number 05-0916.

*Correspondence: gasq.d@chu‑toulouse.fr 4 Service des Explorations Fonctionnelles Physiologiques, Hôpital Rangueil, 1 Avenue du Pr Poulhes, 31059 Toulouse, France Full list of author information is available at the end of the article © The Author(s) 2020. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included i