Searched for: author:"Ortiz, J."
(1 - 8 of 8)
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Tabasi, A. (author), Lazzaroi, M. (author), Brouwer, N.P. (author), Kingma, I. (author), van Dijk, W. (author), de Looze, M.P. (author), Toxiri, S. (author), Ortiz, J. (author), van Dieen, J.H. (author)
Estimation of low-back load can be used to determine the assistance to be provided by an actuated back-support exoskeleton. To this end, an EMG-driven muscle model and a regression model can be implemented. The goal of the regression model is to reduce the number of required sensors for load estimation. Both models need to be calibrated. This...
bookPart 2022
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de Kroon, M.L.A. (author), Sisay Awoke, T. (author), Almansa Ortiz, J. (author), van Buuren, S. (author), Reijneveld, S.A. (author)
Background and aims. Evidence on the association between BMI increase in early life and cognitive functioning in later life is scarce and inconsistent; this also regards the causal pathways. We assessed the associations of individual BMI trajectories from birth until age 19 with cognitive functioning in young adulthood. Second, we studied...
conference paper 2019
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Koopman, A.S. (author), Toxiri, S. (author), Power, V. (author), Kingma, I. (author), van Dieën, J.H. (author), Ortiz, J. (author), de Looze, M.P. (author)
With mechanical loading as the main risk factor for LBP, exoskeletons (EXO)are designed to reduce the load on the back by taking over part of the moment normally generated by back muscles. The present study investigated the effect of an active exoskeleton, controlled using three different control modes (INCLINATION, EMG & HYBRID), on spinal...
article 2019
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Toxiri, S. (author), Koopmans, A.S. (author), Lazzaroni, M. (author), Ortiz, J. (author), Power, V. (author), de Looze, M.P. (author), O'Sullivan, L. (author), Caldwell, D.G. (author)
The potential versatility of active exoskeletons is achieved by appropriately modulating their actuation forces. This is done by assistive strategies that interpret user’s movements and assistance needs during operation. This article shows how different strategies determine the effectiveness of an active back-support exoskeleton designed to...
article 2019
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Huysamen, K. (author), de Looze, M.P. (author), Bosch, T. (author), Ortiz, J. (author), Toxin, S. (author), O'Sullivan, L.W. (author)
The aim of this study was to evaluate the effect of an industrial exoskeleton on muscle activity, perceived musculoskeletal effort, measured and perceived contact pressure at the trunk, thighs and shoulders, and subjective usability for simple sagittal plane lifting and lowering conditions. Twelve male participants lifted and lowered a box of 7...
article 2018
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Toxiri, S. (author), Koopman, A.S. (author), Lazzaroni, M. (author), Ortiz, J. (author), Power, V. (author), de Looze, M.P. (author), O'Sullivan, L. (author), Caldwell, D.G. (author)
Active exoskeletons are potentially more effective and versatile than passive ones, but designing them poses a number of additional challenges. An important open challenge in the field is associated to the assistive strategy, by which the actuation forces are modulated to the user's needs during the physical activity. This paper addresses this...
article 2018
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Cobb, Z. (author), de Vries, R. (author), Spooner, N. (author), Williams, S. (author), Staelens, L. (author), Doig, M. (author), Broadhurst, R. (author), Barfield, M. (author), van de Merbel, N. (author), Schmid, B. (author), Siethoff, C. (author), Ortiz, J. (author), Verheij, E. (author), van Baar, B. (author), White, S. (author), Timmerman, P. (author)
Background: At the start of their work, the European Bioanalysis Forum dried blood spots microsampling consortium did not form a dedicated team to investigate the spot homogeneity. However, two teams performed experiments that produced results relating to sample homogeneity. Results: The data, which were produced via two different approaches (a...
article 2013
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de Vries, R. (author), Barfield, M. (author), van de Merbel, N. (author), Schmid, B. (author), Siethoff, C. (author), Ortiz, J. (author), Verheij, E. (author), van Baar, B. (author), Cobb, Z. (author), White, S. (author), Timmerman, P. (author)
Background: The European Bioanalysis Forum dried blood spots (DBS)/microsampling consortium is reporting back from the experiments they performed on further documenting the potential hurdles of the DBS technology. This paper is focused on the impact of hematocrit changes on DBS analyses. Results: The hematocrit can have an effect on the size of...
article 2013
Searched for: author:"Ortiz, J."
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