{"title":"力场扰动和肌肉振动加强了健康成年人稳态步态中与稳定性相关的足部位置反应","authors":"A.M. van Leeuwen , S.M. Bruijn , J.C. Dean","doi":"10.1016/j.humov.2024.103243","DOIUrl":null,"url":null,"abstract":"<div><p>Mediolateral gait stability can be maintained by coordinating our foot placement with respect to the center-of-mass (CoM) kinematic state. Neurological impairments can reduce the degree of foot placement control. For individuals with such impairments, interventions that could improve foot placement control could thus contribute to improved gait stability. In this study we aimed to better understand two potential interventions, by investigating their effect in neurologically intact individuals. The degree of foot placement control can be quantified based on a foot placement model, in which the CoM position and velocity during swing predict subsequent foot placement. Previously, perturbing foot placement with a force-field resulted in an enhanced degree of foot placement control as an after-effect. Moreover, timed muscle vibration enhanced the degree of foot placement control whilst the vibration was applied. Here, we replicated these two findings and further investigated whether Q1) timed muscle vibration leads to an after-effect and Q2) whether combining timed muscle vibration with force-field perturbations leads to a larger after-effect, as compared to force-field perturbations only. In addition, we evaluated several potential contributors to the degree of foot placement control, by considering foot placement errors, CoM variability and the CoM position gain (β<sub>pos</sub>) of the foot placement model, next to the R<sup>2</sup> measure as the degree of foot placement control. Timed muscle vibration led to a higher degree of foot placement control as an after-effect (Q1). However, combining timed muscle vibration and force-field perturbations did not lead to a larger after-effect, as compared to following force-field perturbations only (Q2). Furthermore, we showed that the improved degree of foot placement control following force-field perturbations and during/following muscle vibration, did not reflect diminished foot placement errors. Rather, participants demonstrated a stronger active response (higher β<sub>pos</sub>) as well as higher CoM variability.</p></div>","PeriodicalId":55046,"journal":{"name":"Human Movement Science","volume":"96 ","pages":"Article 103243"},"PeriodicalIF":1.6000,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0167945724000666/pdfft?md5=9f5e8684d1caf950696a3ab6bf056e8e&pid=1-s2.0-S0167945724000666-main.pdf","citationCount":"0","resultStr":"{\"title\":\"Force-field perturbations and muscle vibration strengthen stability-related foot placement responses during steady-state gait in healthy adults\",\"authors\":\"A.M. van Leeuwen , S.M. Bruijn , J.C. 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Moreover, timed muscle vibration enhanced the degree of foot placement control whilst the vibration was applied. Here, we replicated these two findings and further investigated whether Q1) timed muscle vibration leads to an after-effect and Q2) whether combining timed muscle vibration with force-field perturbations leads to a larger after-effect, as compared to force-field perturbations only. In addition, we evaluated several potential contributors to the degree of foot placement control, by considering foot placement errors, CoM variability and the CoM position gain (β<sub>pos</sub>) of the foot placement model, next to the R<sup>2</sup> measure as the degree of foot placement control. Timed muscle vibration led to a higher degree of foot placement control as an after-effect (Q1). However, combining timed muscle vibration and force-field perturbations did not lead to a larger after-effect, as compared to following force-field perturbations only (Q2). Furthermore, we showed that the improved degree of foot placement control following force-field perturbations and during/following muscle vibration, did not reflect diminished foot placement errors. 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引用次数: 0
摘要
通过协调我们脚的位置与重心(CoM)运动状态,可以保持步态的内外侧稳定性。神经损伤会降低足部位置控制的程度。因此,对于有此类障碍的人来说,能够改善足部位置控制的干预措施有助于提高步态稳定性。在这项研究中,我们旨在通过研究两种潜在干预措施对神经系统完好个体的影响,更好地了解这两种干预措施。足摆放控制的程度可根据足摆放模型进行量化,在该模型中,摆动过程中的CoM位置和速度可预测随后的足摆放。在此之前,用力场干扰脚的位置会导致脚的位置控制程度增强,这是一种后效应。此外,定时的肌肉振动在振动的同时也增强了脚的位置控制程度。在此,我们复制了这两项研究结果,并进一步研究了 Q1)定时肌肉振动是否会导致后效应;Q2)与力场扰动相比,将定时肌肉振动与力场扰动相结合是否会导致更大的后效应。此外,我们还考虑了足部放置误差、CoM 变异性和足部放置模型的 CoM 位置增益 (βpos),以及作为足部放置控制程度的 R2 测量值,从而评估了足部放置控制程度的几个潜在影响因素。定时肌肉振动的后效应(Q1)导致了更高的足部位置控制程度。然而,与只跟随力场扰动相比,结合定时肌肉振动和力场扰动并不会导致更大的后效应(Q2)。此外,我们还发现,在力场扰动和肌肉振动期间/之后,脚的位置控制程度有所提高,但这并不反映脚的位置错误有所减少。相反,参与者表现出了更强的主动反应(更高的βpos)以及更高的CoM变异性。
Force-field perturbations and muscle vibration strengthen stability-related foot placement responses during steady-state gait in healthy adults
Mediolateral gait stability can be maintained by coordinating our foot placement with respect to the center-of-mass (CoM) kinematic state. Neurological impairments can reduce the degree of foot placement control. For individuals with such impairments, interventions that could improve foot placement control could thus contribute to improved gait stability. In this study we aimed to better understand two potential interventions, by investigating their effect in neurologically intact individuals. The degree of foot placement control can be quantified based on a foot placement model, in which the CoM position and velocity during swing predict subsequent foot placement. Previously, perturbing foot placement with a force-field resulted in an enhanced degree of foot placement control as an after-effect. Moreover, timed muscle vibration enhanced the degree of foot placement control whilst the vibration was applied. Here, we replicated these two findings and further investigated whether Q1) timed muscle vibration leads to an after-effect and Q2) whether combining timed muscle vibration with force-field perturbations leads to a larger after-effect, as compared to force-field perturbations only. In addition, we evaluated several potential contributors to the degree of foot placement control, by considering foot placement errors, CoM variability and the CoM position gain (βpos) of the foot placement model, next to the R2 measure as the degree of foot placement control. Timed muscle vibration led to a higher degree of foot placement control as an after-effect (Q1). However, combining timed muscle vibration and force-field perturbations did not lead to a larger after-effect, as compared to following force-field perturbations only (Q2). Furthermore, we showed that the improved degree of foot placement control following force-field perturbations and during/following muscle vibration, did not reflect diminished foot placement errors. Rather, participants demonstrated a stronger active response (higher βpos) as well as higher CoM variability.
期刊介绍:
Human Movement Science provides a medium for publishing disciplinary and multidisciplinary studies on human movement. It brings together psychological, biomechanical and neurophysiological research on the control, organization and learning of human movement, including the perceptual support of movement. The overarching goal of the journal is to publish articles that help advance theoretical understanding of the control and organization of human movement, as well as changes therein as a function of development, learning and rehabilitation. The nature of the research reported may vary from fundamental theoretical or empirical studies to more applied studies in the fields of, for example, sport, dance and rehabilitation with the proviso that all studies have a distinct theoretical bearing. Also, reviews and meta-studies advancing the understanding of human movement are welcome.
These aims and scope imply that purely descriptive studies are not acceptable, while methodological articles are only acceptable if the methodology in question opens up new vistas in understanding the control and organization of human movement. The same holds for articles on exercise physiology, which in general are not supported, unless they speak to the control and organization of human movement. In general, it is required that the theoretical message of articles published in Human Movement Science is, to a certain extent, innovative and not dismissible as just "more of the same."