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Lang-Hodge AM, Cooke DF, Marigold DS. The effects of prior exposure to prism lenses on de novo motor skill learning. PLoS One 2023; 18:e0292518. [PMID: 37862342 PMCID: PMC10588867 DOI: 10.1371/journal.pone.0292518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Accepted: 09/23/2023] [Indexed: 10/22/2023] Open
Abstract
Motor learning involves plasticity in a network of brain areas across the cortex and cerebellum. Such traces of learning have the potential to affect subsequent learning of other tasks. In some cases, prior learning can interfere with subsequent learning, but it may be possible to potentiate learning of one task with a prior task if they are sufficiently different. Because prism adaptation involves extensive neuroplasticity, we reasoned that the elevated excitability of neurons could increase their readiness to undergo structural changes, and in turn, create an optimal state for learning a subsequent task. We tested this idea, selecting two different forms of learning tasks, asking whether exposure to a sensorimotor adaptation task can improve subsequent de novo motor skill learning. Participants first learned a new visuomotor mapping induced by prism glasses in which prism strength varied trial-to-trial. Immediately after and the next day, we tested participants on a mirror tracing task, a form of de novo skill learning. Prism-trained and control participants both learned the mirror tracing task, with similar reductions in error and increases in distance traced. Both groups also showed evidence of offline performance gains between the end of day 1 and the start of day 2. However, we did not detect differences between groups. Overall, our results do not support the idea that prism adaptation learning can potentiate subsequent de novo learning. We discuss factors that may have contributed to this result.
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Affiliation(s)
- Annmarie M. Lang-Hodge
- Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, British Columbia, Canada
| | - Dylan F. Cooke
- Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, British Columbia, Canada
- Institute for Neuroscience and Neurotechnology, Simon Fraser University, Burnaby, British Columbia, Canada
| | - Daniel S. Marigold
- Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, British Columbia, Canada
- Institute for Neuroscience and Neurotechnology, Simon Fraser University, Burnaby, British Columbia, Canada
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2
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Malone LA, Hill NM, Tripp H, Wolpert DM, Bastian AJ. A novel video game for remote studies of motor adaptation in children. Physiol Rep 2023; 11:e15764. [PMID: 37434268 PMCID: PMC10336020 DOI: 10.14814/phy2.15764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 06/19/2023] [Accepted: 06/22/2023] [Indexed: 07/13/2023] Open
Abstract
Here we designed a motor adaptation video game that could be played remotely (at home) through a web browser. This required the child to adapt to a visuomotor rotation between their hand movement and a ball displayed in the game. The task had several novel features, specifically designed to allow the study of the developmental trajectory of adaptation across a wide range of ages. We test the concurrent validity by comparing children's performance on our remote task to the same task performed in the laboratory. All participants remained engaged and completed the task. We quantified feedforward and feedback control during this task. Feedforward control, a key measure of adaptation, was similar at home and in the laboratory. All children could successfully use feedback control to guide the ball to a target. Traditionally, motor learning studies are performed in a laboratory to obtain high quality kinematic data. However, here we demonstrate concurrent validity of kinematic behavior when conducted at home. Our online platform provides the flexibility and ease of collecting data that will enable future studies with large sample sizes, longitudinal experiments, and the study of children with rare diseases.
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Affiliation(s)
- Laura A. Malone
- Kennedy Krieger InstituteBaltimoreMarylandUSA
- Department of NeurologyJohns Hopkins School of MedicineBaltimoreMarylandUSA
- Department of Physical Medicine and RehabilitationJohns Hopkins School of MedicineBaltimoreMarylandUSA
| | - Nayo M. Hill
- Kennedy Krieger InstituteBaltimoreMarylandUSA
- Department of NeuroscienceJohns Hopkins School of MedicineBaltimoreMarylandUSA
| | - Haley Tripp
- Kennedy Krieger InstituteBaltimoreMarylandUSA
| | - Daniel M. Wolpert
- Mortimer B. Zuckerman Mind Brain Behavior InstituteColumbia UniversityNew YorkNew YorkUSA
- Department of NeuroscienceColumbia UniversityNew YorkNew YorkUSA
| | - Amy J. Bastian
- Kennedy Krieger InstituteBaltimoreMarylandUSA
- Department of NeuroscienceJohns Hopkins School of MedicineBaltimoreMarylandUSA
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3
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Chaudhuri JD. An initial preparation for human cadaveric dissection ameliorates the associated mental distress in students. ANATOMICAL SCIENCES EDUCATION 2022; 15:910-927. [PMID: 34143562 DOI: 10.1002/ase.2112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Revised: 05/31/2021] [Accepted: 06/06/2021] [Indexed: 06/12/2023]
Abstract
It is universally recognized that cadaveric dissection is an essential part of anatomy training. However, it has been reported to induce mental distress in some students and impair their intrinsic motivation (IM) to study. One of the postulated reasons for this behavior is the lack of adequate information and preparation of students for cadaveric dissection. Therefore, it is hypothesized that providing relevant information prior to cadaveric dissection will ameliorate the mental distress, enhance the IM of students, and improve their academic performance. A cohort of occupational therapy students enrolled in an anatomy course were psychologically prepared for cadaveric dissection. Students were provided with a curated list of YouTube videos and peer-reviewed journal articles related to cadaveric dissection prior to the commencement of the anatomy course. All students were also required to attend an oral presentation immediately before commencing dissection. The control group included students who had not been provided with any resources in preparation for cadaveric dissection. Compared to the control group, students who had been prepared demonstrated better quality of cadaveric dissection, improved academic performance, reported less mental distress and greater IM. Moreover, students reported the oral presentation to be most relevant and journal articles to be least useful in their preparation. Therefore, this is an effective approach in the amelioration of mental distress and improvement of performance in anatomy students. Consequently, this study represents a paradigm shift in the pedagogy of anatomy, and could represent a vital element in the evolution of a revitalized anatomy curriculum.
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Affiliation(s)
- Joydeep Dutta Chaudhuri
- School of Occupational Therapy, College of Health Sciences, Husson University, Bangor, Maine, USA
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4
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Sato S, Cui A, Choi JT. Visuomotor errors drive step length and step time adaptation during 'virtual' split-belt walking: the effects of reinforcement feedback. Exp Brain Res 2021; 240:511-523. [PMID: 34816293 DOI: 10.1007/s00221-021-06275-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Accepted: 11/11/2021] [Indexed: 10/19/2022]
Abstract
Precise foot placement is dependent on changes in spatial and temporal coordination between two legs in response to a perturbation during walking. Here, we used a 'virtual' split-belt adaptation task to examine the effects of reinforcement (reward and punishment) feedback about foot placement on the changes in error, step length and step time asymmetry. Twenty-seven healthy adults (20 ± 2.5 years) walked on a treadmill with continuous feedback of the foot position and stepping targets projected on a screen, defined by a visuomotor gain for each leg. The paradigm consisted of a baseline period (same gain on both legs), visuomotor adaptation period (split: one high = 'fast', one low = 'slow' gain) and post-adaptation period (same gain). Participants were divided into 3 groups: control group received no score, reward group received increasing score for each target hit, and punishment group received decreasing score for each target missed. Re-adaptation was assessed 24 ± 2 h later. During early adaptation, the slow foot undershot and fast foot overshot the stepping target. Foot placement errors were gradually reduced by late adaptation, accompanied by increasing step length asymmetry (fast < slow step length) and step time asymmetry (fast > slow step time). Only the punishment group showed greater error reduction and step length re-adaptation on the next day. The results show that (1) explicit feedback of foot placement alone drives adaptation of both step length and step time asymmetry during virtual split-belt walking, and (2) specifically, step length re-adaptation driven by visuomotor errors may be enhanced by punishment feedback.
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Affiliation(s)
- Sumire Sato
- Neuroscience and Behavior Program, University of Massachusetts Amherst, Amherst, MA, USA.,Department of Applied Physiology and Kinesiology, University of Florida, Gainesville, FL, USA
| | - Ashley Cui
- Public Health Science Program, University of Massachusetts Amherst, Amherst, MA, USA
| | - Julia T Choi
- Neuroscience and Behavior Program, University of Massachusetts Amherst, Amherst, MA, USA. .,Department of Applied Physiology and Kinesiology, University of Florida, Gainesville, FL, USA.
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5
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Leow LA, Tresilian JR, Uchida A, Koester D, Spingler T, Riek S, Marinovic W. Acoustic stimulation increases implicit adaptation in sensorimotor adaptation. Eur J Neurosci 2021; 54:5047-5062. [PMID: 34021941 DOI: 10.1111/ejn.15317] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 05/07/2021] [Accepted: 05/14/2021] [Indexed: 11/29/2022]
Abstract
Sensorimotor adaptation is an important part of our ability to perform novel motor tasks (i.e., learning of motor skills). Efforts to improve adaptation in healthy and clinical patients using non-invasive brain stimulation methods have been hindered by inter-individual and intra-individual variability in brain susceptibility to stimulation. Here, we explore unpredictable loud acoustic stimulation as an alternative method of modulating brain excitability to improve sensorimotor adaptation. In two experiments, participants moved a cursor towards targets, and adapted to a 30º rotation of cursor feedback, either with or without unpredictable acoustic stimulation. Acoustic stimulation improved initial adaptation to sensory prediction errors in Study 1, and improved overnight retention of adaptation in Study 2. Unpredictable loud acoustic stimulation might thus be a potent method of modulating sensorimotor adaptation in healthy adults.
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Affiliation(s)
- Li-Ann Leow
- School of Psychology, The University of Queensland, Brisbane, QLD, Australia.,School of Human Movement and Nutrition Sciences, The University of Queensland, Brisbane, QLD, Australia
| | | | - Aya Uchida
- School of Psychology, The University of Queensland, Brisbane, QLD, Australia
| | - Dirk Koester
- BSP Business School Berlin, Berlin, Germany.,Department of Sport Science, Bielefeld University, Bielefeld, Germany
| | - Tamara Spingler
- Spinal Cord Injury Center, Heidelberg University Hospital, Heidelberg, Germany
| | - Stephan Riek
- School of Human Movement and Nutrition Sciences, The University of Queensland, Brisbane, QLD, Australia.,Graduate Research School, University of Sunshine Coast, Sippy Downs, Australia
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Bakkum A, Donelan JM, Marigold DS. Savings in sensorimotor learning during balance-challenged walking but not reaching. J Neurophysiol 2021; 125:2384-2396. [PMID: 34038257 DOI: 10.1152/jn.00627.2020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Safe and successful motor performance relies on the ability to adapt to physiological and environmental change and retain what is learned. An open question is what factors maximize this retention? One overlooked factor is the degree to which balance is challenged during learning. We propose that the greater need for control and/or perceived threat of falling or injury associated with balance-challenging tasks increases the value assigned to maintaining a learned visuomotor mapping (i.e., the new relationship between visual input and motor output). And we propose that a greater-valued mapping is a more retainable mapping, as it serves to benefit future motor performance. Thus, we tested the hypothesis that challenging balance enhances motor memory, reflected by greater recall and faster relearning (i.e., savings). Four groups of participants adapted to a novel visuomotor mapping induced by prism lenses while performing a reaching or walking task, with and without an additional balance challenge. We found that challenging balance did not disrupt visuomotor adaptation during reaching or walking. We then probed recall and savings by having participants repeat the adaptation protocol 1 wk later. For reaching, we found evidence of initial recall, though neither group demonstrated savings upon reexposure to the prisms. In contrast, both walking groups demonstrated significant initial recall and savings. In addition, we found that challenging balance significantly enhanced savings during walking. Taken together, our results demonstrate the robustness of motor memories formed during walking and highlight the potential influence of balance control on sensorimotor learning.NEW & NOTEWORTHY Most everyday tasks challenge our balance. Yet, this aspect of daily motor behavior is often overlooked in adaptation paradigms. Here, we show that challenging balance does not impair sensorimotor adaptation during precision reaching and walking tasks. Furthermore, we show that challenging balance enhances savings of a learned visuomotor mapping during walking. These results provide evidence for the potential performance benefits associated with learning during unconstrained, naturalistic behaviors.
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Affiliation(s)
- Amanda Bakkum
- Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, British Columbia, Canada
| | - J Maxwell Donelan
- Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, British Columbia, Canada
| | - Daniel S Marigold
- Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, British Columbia, Canada
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Bakkum A, Gunn SM, Marigold DS. How aging affects visuomotor adaptation and retention in a precision walking paradigm. Sci Rep 2021; 11:789. [PMID: 33437012 PMCID: PMC7804256 DOI: 10.1038/s41598-020-80916-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Accepted: 12/28/2020] [Indexed: 01/22/2023] Open
Abstract
Motor learning is a lifelong process. However, age-related changes to musculoskeletal and sensory systems alter the relationship (or mapping) between sensory input and motor output, and thus potentially affect motor learning. Here we asked whether age affects the ability to adapt to and retain a novel visuomotor mapping learned during overground walking. We divided participants into one of three groups (n = 12 each) based on chronological age: a younger-aged group (20–39 years old); a middle-aged group (40–59 years old); and an older-aged group (60–80 years old). Participants learned a new visuomotor mapping, induced by prism lenses, during a precision walking task. We assessed retention one-week later. We did not detect significant effects of age on measures of adaptation or savings (defined as faster relearning). However, we found that older adults demonstrated reduced initial recall of the mapping, reflected by greater foot-placement error during the first adaptation trial one-week later. Additionally, we found that increased age significantly associated with reduced initial recall. Overall, our results suggest that aging does not impair adaptation and that older adults can demonstrate visuomotor savings. However, older adults require some initial context during relearning to recall the appropriate mapping.
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Affiliation(s)
- Amanda Bakkum
- Department of Biomedical Physiology and Kinesiology, Simon Fraser University, 8888 University Drive, Burnaby, BC, V5A 1S6, Canada
| | - Shaila M Gunn
- Department of Biomedical Physiology and Kinesiology, Simon Fraser University, 8888 University Drive, Burnaby, BC, V5A 1S6, Canada
| | - Daniel S Marigold
- Department of Biomedical Physiology and Kinesiology, Simon Fraser University, 8888 University Drive, Burnaby, BC, V5A 1S6, Canada.
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Tays G, Bao S, Javidialsaadi M, Wang J. Consolidation of use-dependent motor memories induced by passive movement training. Neurosci Lett 2020; 732:135080. [PMID: 32464264 DOI: 10.1016/j.neulet.2020.135080] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Revised: 05/13/2020] [Accepted: 05/21/2020] [Indexed: 11/16/2022]
Abstract
Motor adaptation, a type of motor learning, is often thought to involve two distinct processes: error-based and use-dependent learning. Passive movement training, which is associated with use-dependent learning, can facilitate motor adaptation, although it is unknown how long its facilitative effect can last. The objective of this study was to examine the lasting effect of passive training on visuomotor adaptation for the duration of up to 24 h. Neurotypical, right-handed subjects experienced four experimental sessions: baseline, training, time delay and testing. In the training session, all subjects received passive training of their dominant arm that was moved by an exoskeletal robot in a "desired" target direction repeatedly. Following that, the subjects experienced a time delay of 5 min, 1 h or 24 h. In the testing session, the subjects performed reaching movements under a novel visuomotor condition, in which the visual display was rotated 30 degrees counterclockwise about the start circle. Control subjects experienced the baseline and testing sessions with a time delay of 5 min between the two sessions. Results indicate that the 1-h and 24-h groups, but not the 5-min group, adapted to the rotation significantly better than the controls. This finding has an implication for neurorehabilitation suggesting, for example, that passive proprioceptive training may indeed be a viable option for improving arm motor function in stroke survivors with severe hemiparesis, for whom efficient intervention techniques are very limited.
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Affiliation(s)
- Grant Tays
- Department of Kinesiology, University of Wisconsin-Milwaukee, Milwaukee, WI 53201, United States
| | - Shancheng Bao
- Department of Kinesiology, University of Wisconsin-Milwaukee, Milwaukee, WI 53201, United States
| | - Mousa Javidialsaadi
- Department of Kinesiology, University of Wisconsin-Milwaukee, Milwaukee, WI 53201, United States
| | - Jinsung Wang
- Department of Kinesiology, University of Wisconsin-Milwaukee, Milwaukee, WI 53201, United States.
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9
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Task Errors Drive Memories That Improve Sensorimotor Adaptation. J Neurosci 2020; 40:3075-3088. [PMID: 32029533 DOI: 10.1523/jneurosci.1506-19.2020] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Revised: 01/20/2020] [Accepted: 01/25/2020] [Indexed: 11/21/2022] Open
Abstract
Traditional views of sensorimotor adaptation (i.e., adaptation of movements to perturbed sensory feedback) emphasize the role of automatic, implicit correction of sensory prediction errors. However, latent memories formed during sensorimotor adaptation, manifest as improved relearning (e.g., savings), have recently been attributed to strategic corrections of task errors (failures to achieve task goals). To dissociate contributions of task errors and sensory prediction errors to latent sensorimotor memories, we perturbed target locations to remove or enforce task errors during learning and/or test, with male/female human participants. Adaptation improved after learning in all conditions where participants were permitted to correct task errors, and did not improve whenever we prevented correction of task errors. Thus, previous correction of task errors was both necessary and sufficient to improve adaptation. In contrast, a history of sensory prediction errors was neither sufficient nor obligatory for improved adaptation. Limiting movement preparation time showed that the latent memories driven by learning to correct task errors take at least two forms: a time-consuming but flexible component, and a rapidly expressible, inflexible component. The results provide strong support for the idea that movement corrections driven by a failure to successfully achieve movement goals underpin motor memories that manifest as savings. Such persistent memories are not exclusively mediated by time-consuming strategic processes but also comprise a rapidly expressible but inflexible component. The distinct characteristics of these putative processes suggest dissociable underlying mechanisms, and imply that identification of the neural basis for adaptation and savings will require methods that allow such dissociations.SIGNIFICANCE STATEMENT Latent motor memories formed during sensorimotor adaptation manifest as improved adaptation when sensorimotor perturbations are reencountered. Conflicting theories suggest that this "savings" is underpinned by different mechanisms, including a memory of successful actions, a memory of errors, or an aiming strategy to correct task errors. Here we show that learning to correct task errors is sufficient to show improved subsequent adaptation with respect to naive performance, even when tested in the absence of task errors. In contrast, a history of sensory prediction errors is neither sufficient nor obligatory for improved adaptation. Finally, we show that latent sensorimotor memories driven by task errors comprise at least two distinct components: a time-consuming, flexible component, and a rapidly expressible, inflexible component.
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Panizzolo FA, Freisinger GM, Karavas N, Eckert-Erdheim AM, Siviy C, Long A, Zifchock RA, LaFiandra ME, Walsh CJ. Metabolic cost adaptations during training with a soft exosuit assisting the hip joint. Sci Rep 2019; 9:9779. [PMID: 31278286 PMCID: PMC6611879 DOI: 10.1038/s41598-019-45914-5] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Accepted: 06/17/2019] [Indexed: 11/09/2022] Open
Abstract
Different adaptation rates have been reported in studies involving ankle exoskeletons designed to reduce the metabolic cost of their wearers. This work aimed to investigate energetic adaptations occurring over multiple training sessions, while walking with a soft exosuit assisting the hip joint. The participants attended five training sessions within 20 days. They walked carrying a load of 20.4 kg for 20 minutes with the exosuit powered and five minutes with the exosuit unpowered. Percentage change in net metabolic cost between the powered and unpowered conditions improved across sessions from -6.2 ± 3.9% (session one) to -10.3 ± 4.7% (session five), indicating a significant effect associated with training. The percentage change at session three (-10.5 ± 4.5%) was similar to the percentage change at session five, indicating that two 20-minute sessions may be sufficient for users to fully adapt and maximize the metabolic benefit provided by the exoskeleton. Retention was also tested measuring the metabolic reduction five months after the last training session. The percent change in metabolic cost during this session (-10.1 ± 3.2%) was similar to the last training session, indicating that the adaptations resulting in reduced metabolic cost are preserved. These outcomes are relevant when evaluating exoskeletons' performance on naïve users, with a specific focus on hip extension assistance.
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Affiliation(s)
- Fausto A Panizzolo
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, 29 Oxford Street, Cambridge, MA, 02138, USA
- Wyss Institute for Biologically Inspired Engineering at Harvard, 3 Blackfan Circle, Boston, MA, 02115, USA
| | - Gregory M Freisinger
- Department of Civil and Mechanical Engineering, United States Military Academy, 752 Thayer Road, West Point, NY, 10996, USA.
- United States Army Research Laboratory, Aberdeen Proving Ground, 4727 Deer Creek Loop, MD, 21005, Maryland, USA.
- 75th Innovation Command, United States Army, 10949 Aerospace Ave, Houston, TX, 77034, USA.
| | - Nikos Karavas
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, 29 Oxford Street, Cambridge, MA, 02138, USA
- Wyss Institute for Biologically Inspired Engineering at Harvard, 3 Blackfan Circle, Boston, MA, 02115, USA
| | - Asa M Eckert-Erdheim
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, 29 Oxford Street, Cambridge, MA, 02138, USA
- Wyss Institute for Biologically Inspired Engineering at Harvard, 3 Blackfan Circle, Boston, MA, 02115, USA
| | - Christopher Siviy
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, 29 Oxford Street, Cambridge, MA, 02138, USA
- Wyss Institute for Biologically Inspired Engineering at Harvard, 3 Blackfan Circle, Boston, MA, 02115, USA
| | - Andrew Long
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, 29 Oxford Street, Cambridge, MA, 02138, USA
- Wyss Institute for Biologically Inspired Engineering at Harvard, 3 Blackfan Circle, Boston, MA, 02115, USA
| | - Rebecca A Zifchock
- Department of Civil and Mechanical Engineering, United States Military Academy, 752 Thayer Road, West Point, NY, 10996, USA
| | - Michael E LaFiandra
- United States Army Research Laboratory, Aberdeen Proving Ground, 4727 Deer Creek Loop, MD, 21005, Maryland, USA
| | - Conor J Walsh
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, 29 Oxford Street, Cambridge, MA, 02138, USA
- Wyss Institute for Biologically Inspired Engineering at Harvard, 3 Blackfan Circle, Boston, MA, 02115, USA
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