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The effect of these disturbances can be either assistive or resistive forces depending on the patient's movement, which increase or decrease the speed of the affected joints by forcing the control unit to act consequently. In some therapies, like gait assistance, it is also essential to maintain synchronization between joint movements, to ensure a dynamic stability. A force control approach is used for all the joints individually, while two control methods are defined to act when disturbances are detected: Cartesian position control (Cartesian level) and Variable execution speed (joint level). The trajectory to be followed by the patient is previously recorded using an active exoskeleton, H1, worn by healthy subjects. A realistic simulation model of the exoskeleton is used for testing the effect of disturbances on the particular joints and on the planned trajectory and for evaluating the performance of the two proposed control methods. The performances of the presented methods are evaluated by comparing the resulting trajectories with respect to those planned. The evaluation of the most suitable method is performed considering the following factors: stability, minimum time delay and synchronization of the joints.<\/p>","DOI":"10.4018\/ijsda.2014040103","type":"journal-article","created":{"date-parts":[[2014,9,15]],"date-time":"2014-09-15T08:28:58Z","timestamp":1410769738000},"page":"34-49","source":"Crossref","is-referenced-by-count":6,"title":["Recovering Planned Trajectories in Robotic Rehabilitation Therapies under the Effect of Disturbances"],"prefix":"10.4018","volume":"3","author":[{"given":"Vijaykumar","family":"Rajasekaran","sequence":"first","affiliation":[{"name":"Institute for Bioengineering of Catalonia & Universitat Polit\u00e8cnica de Catalunya, Barcelona Tech, Barcelona, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joan","family":"Aranda","sequence":"additional","affiliation":[{"name":"Institute for Bioengineering of Catalonia & Universitat Polit\u00e8cnica de Catalunya, Barcelona Tech, Barcelona, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alicia","family":"Casals","sequence":"additional","affiliation":[{"name":"Institute for Bioengineering of Catalonia & Universitat Polit\u00e8cnica de Catalunya, Barcelona Tech, Barcelona, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"2432","reference":[{"key":"ijsda.2014040103-0","doi-asserted-by":"crossref","unstructured":"Aguirre-Ollinger, G., Colgate, J. 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