@article{ef715ec2bf834e439c98ef0d036b3d2f,
title = "Comparison of the human-exosuit interaction using ankle moment and ankle positive power inspired walking assistance",
abstract = " Previous ankle exoskeleton assistance techniques that were able to demonstrate metabolic reductions can be categorized into those that delivered moment profiles similar to the biological ankle moment throughout the stance phase, and others that delivered positive power only during push off. Both assistance techniques and a powered-off condition were compared in treadmill walking (1.5 m s −1 ) with a soft exosuit. We hypothesized that both techniques can result in a similar metabolic reduction when providing a similar level of average positive exosuit power at each ankle (0.12 W kg −1 ) and hip (0.02 W kg −1 ) while the underlying global center-of-mass and local joint biomechanics would be different. We found a similar net metabolic rate reduction of 15% relative to walking with the suit powered-off for both techniques. The ankle moment inspired technique showed larger magnitudes of reductions for biological moment and power at the hip and the ankle. The ankle power inspired technique might benefit from higher biological efficiency, when reducing positive instead of negative power at the knee and when almost keeping the isometric function of the plantarflexors before push-off. Changes at the ankle caused energetic reductions at the knee, hip and the center-of-mass. A major contribution to metabolic reduction might be based on them. As the lower limb biomechanics that led to these reductions were different, we believe that humans alter their gait to maximize their energetic benefit based on the exosuit assistance. For further insights on mechanisms that lead to metabolic reduction, joint mechanics and muscle-tendon dynamics must be analyzed in combination. ",
keywords = "Assistance, Control, Exosuit, Moment, Power",
author = "Martin Grimmer and Quinlivan, {Brendan T.} and Sangjun Lee and Philippe Malcolm and Rossi, {Denise Martineli} and Christopher Siviy and Walsh, {Conor J.}",
note = "Funding Information: This material is based upon the work supported by the Defense Advanced Research Projects Agency (DARPA), the National Science Foundation (Grant No. CNS-1446464), Warrior Web Program (Contract No. W911NF-14-C-0051), the National Science Foundation Graduate Research Fellowship Program (Grant No. DGE1144152), the Samsung Scholarship, the S{\~a}o Paulo Research Foundation (FAPESP; Grant No. 2015/02116-1), and the Robert Bosch Stiftung (Grant No. 32.5.G412.0003.0) and the Center for Research in Human Movement Variability of the University of Nebraska Omaha and the NIH (P20GM109090). This work was also partially funded by the Wyss Institute and the John A. Paulson School of Engineering and Applied Sciences at Harvard University. Funding Information: This material is based upon the work supported by the Defense Advanced Research Projects Agency (DARPA), the National Science Foundation (Grant No. CNS-1446464 ), Warrior Web Program (Contract No. W911NF-14-C-0051), the National Science Foundation Graduate Research Fellowship Program (Grant No. DGE1144152), the Samsung Scholarship, the S{\~a}o Paulo Research Foundation (FAPESP; Grant No. 2015/02116-1), and the Robert Bosch Stiftung (Grant No. 32.5.G412.0003.0) and the Center for Research in Human Movement Variability of the University of Nebraska Omaha and the NIH (P20GM109090). This work was also partially funded by the Wyss Institute and the John A. Paulson School of Engineering and Applied Sciences at Harvard University. Funding Information: This material is based upon the work supported by the Defense Advanced Research Projects Agency (DARPA), the National Science Foundation (Grant No. CNS-1446464), Warrior Web Program (Contract No. W911NF-14-C-0051), the National Science Foundation Graduate Research Fellowship Program (Grant No. DGE1144152), the Samsung Scholarship, the S?o Paulo Research Foundation (FAPESP; Grant No. 2015/02116-1), and the Robert Bosch Stiftung (Grant No. 32.5.G412.0003.0) and the Center for Research in Human Movement Variability of the University of Nebraska Omaha and the NIH (P20GM109090). This work was also partially funded by the Wyss Institute and the John A. Paulson School of Engineering and Applied Sciences at Harvard University. Publisher Copyright: {\textcopyright} 2018 The Authors",
year = "2019",
month = jan,
day = "23",
doi = "10.1016/j.jbiomech.2018.11.023",
language = "English (US)",
volume = "83",
pages = "76--84",
journal = "Journal of Biomechanics",
issn = "0021-9290",
publisher = "Elsevier Limited",
}