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Adaptation of the Compensatory Stepping Response Following Predictable and Unpredictable Perturbation Training

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Title: Adaptation of the Compensatory Stepping Response Following Predictable and Unpredictable Perturbation Training
Authors: Hasegawa, Naoya Browse this author →KAKEN DB
Tanaka, Shintaro Browse this author
Mani, Hiroki Browse this author →KAKEN DB
Inoue, Takahiro Browse this author
Wang, Yun Browse this author
Watanabe, Kazuhiko Browse this author
Asaka, Tadayoshi Browse this author →KAKEN DB
Keywords: compensatory stepping
margin of stability
automatic postural response
motor adaptation
postural perturbation
Issue Date: 15-Jul-2021
Publisher: Frontiers Media
Journal Title: Frontiers in human neuroscience
Volume: 15
Start Page: 674960
Publisher DOI: 10.3389/fnhum.2021.674960
Abstract: Background: Effective training of the backward step response could be beneficial to improve postural stability and prevent falls. Unpredicted perturbation-based balance training (PBT), widely known as compensatory-step training, may enhance the fear of falling and the patterns of postural muscle co-contraction. Contrastingly, PBT with predictable direction or both direction and timing would suppress the fear and the co-contraction patterns during training, but the efficacy of predictable PBT for unpredictable perturbations is still unknown. Objective: To compare the adaptation effects of compensatory-step training with and without predictable perturbations on backward stepping against unpredictable perturbations. Methods: Thirty-three healthy young adults were randomly assigned to one of the following step training groups: Unpredicted, Predicted, and Self-initiated. In training sessions, participants were perturbed to induce a compensatory step with (Predicted group) or without (Unpredicted group) knowledge of the perturbation's direction or while knowing both the direction and timing of the perturbation (Self-initiated group). In test sessions (pre- and post-training), participants were instructed to recover their postural stability in response to an unpredicted perturbation. The margin of stability (MOS), center of mass (COM) shift, and step characteristics were measured during a backward step in both test and training sessions. Results: All three groups showed a significant increase in the step length and velocity in the post-training sessions compared to those in the pre-training sessions. Moreover, in the Unpredicted and Predicted groups, but not in the Self-initiated group, the MOS at step contact was significantly increased following the training session. In addition, the Self-initiated group showed a significant increase in COM shift at 50 ms after slip onset during training compared to the Unpredicted and Predicted groups. Conclusion: Unpredicted and predicted PBT improve step characteristics during backward stepping against unpredictable perturbations. Moreover, the unpredictable PBT and PBT with direction-predictable perturbations enhance the feedback postural control reflected as the postural stability at step contact.
Type: article
Appears in Collections:保健科学院・保健科学研究院 (Graduate School of Health Sciences / Faculty of Health Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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