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da Silva Costa AA, Moraes R, den Otter R, Gennaro F, Bakker L, Rocha Dos Santos PC, Hortobágyi T. Corticomuscular and intermuscular coherence as a function of age and walking balance difficulty. Neurobiol Aging 2024; 141:85-101. [PMID: 38850592 DOI: 10.1016/j.neurobiolaging.2024.05.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Revised: 04/12/2024] [Accepted: 05/08/2024] [Indexed: 06/10/2024]
Abstract
We determined beta-band intermuscular (IMC) and corticomuscular coherence (CMC) as a function of age and walking balance difficulty. Younger (n=14, 23y) and older individuals (n=19, 71y) walked 13 m overground, on a 6-cm-wide ribbon overground, and on a 6-cm-wide (5-cm-high) beam. Walking distance as a proxy for walking balance and speed were computed. CMC was estimated between electroencephalographic signal at Cz electrode and surface electromyographic signals of seven leg muscles, while IMC was calculated in four pairs of leg muscles, during stance and swing gait phases. With increasing difficulty, walking balance decreased in old individuals and speed decreased gradually independent of age. Beam walking increased IMC, while age increased IMC in proximal muscle pairs, and decreased IMC in distal muscle pairs. Age and difficulty increased CMC independent of gait phases. Concluding, CMC and IMC increased with walking balance difficulty and age, except for distal muscle pairs, which had lower IMC with age. These findings suggest an age-related increase in corticospinal involvement in the neural control of walking balance. DATA AVAILABILITY: The datasets used in this study are available from the corresponding author upon reasonable request.
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Affiliation(s)
- Andréia Abud da Silva Costa
- Ribeirão Preto Medical School, Graduate Program in Rehabilitation and Functional Performance, University of São Paulo, Brazil; Biomechanics and Motor Control Lab, School of Physical Education and Sport of Ribeirão Preto, University of São Paulo, Brazil; Department of Human Movement Sciences, University of Groningen Medical Center, Groningen, the Netherlands.
| | - Renato Moraes
- Ribeirão Preto Medical School, Graduate Program in Rehabilitation and Functional Performance, University of São Paulo, Brazil; Biomechanics and Motor Control Lab, School of Physical Education and Sport of Ribeirão Preto, University of São Paulo, Brazil
| | - Rob den Otter
- Department of Human Movement Sciences, University of Groningen Medical Center, Groningen, the Netherlands
| | - Federico Gennaro
- Department of Biomedical Sciences, University of Padua, Padua, Italy
| | - Lisanne Bakker
- Department of Human Movement Sciences, University of Groningen Medical Center, Groningen, the Netherlands
| | - Paulo Cezar Rocha Dos Santos
- Department of Computer Science & Applied Mathematics, Weizmann Institute of Science, Israel; The Center of Advanced Technologies in Rehabilitation, Sheba Medical Center, Israel; IDOR/Pioneer Science Initiative, Rio de Janeiro, RJ, Brazil
| | - Tibor Hortobágyi
- Department of Human Movement Sciences, University of Groningen Medical Center, Groningen, the Netherlands; Department of Kinesiology, Hungarian University of Sports Science, Budapest 1123, Hungary; Department of Sport Biology, Institute of Sport Sciences and Physical Education, University of Pécs, Pécs, Hungary
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Borzelli D, Vieira TMM, Botter A, Gazzoni M, Lacquaniti F, d'Avella A. Synaptic inputs to motor neurons underlying muscle coactivation for functionally different tasks have different spectral characteristics. J Neurophysiol 2024; 131:1126-1142. [PMID: 38629162 DOI: 10.1152/jn.00199.2023] [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: 05/15/2023] [Revised: 04/11/2024] [Accepted: 04/11/2024] [Indexed: 06/01/2024] Open
Abstract
The central nervous system (CNS) may produce the same endpoint trajectory or torque profile with different muscle activation patterns. What differentiates these patterns is the presence of cocontraction, which does not contribute to effective torque generation but allows to modulate joints' mechanical stiffness. Although it has been suggested that the generation of force and the modulation of stiffness rely on separate pathways, a characterization of the differences between the synaptic inputs to motor neurons (MNs) underlying these tasks is still missing. In this study, participants coactivated the same pair of upper-limb muscles, i.e., the biceps brachii and the triceps brachii, to perform two functionally different tasks: limb stiffness modulation or endpoint force generation. Spike trains of MNs were identified through decomposition of high-density electromyograms (EMGs) collected from the two muscles. Cross-correlogram showed a higher synchronization between MNs recruited to modulate stiffness, whereas cross-muscle coherence analysis revealed peaks in the β-band, which is commonly ascribed to a cortical origin. These peaks did not appear during the coactivation for force generation, thus suggesting separate cortical inputs for stiffness modulation. Moreover, a within-muscle coherence analysis identified two subsets of MNs that were selectively recruited to generate force or regulate stiffness. This study is the first to highlight different characteristics, and probable different neural origins, of the synaptic inputs driving a pair of muscles under different functional conditions. We suggest that stiffness modulation is driven by cortical inputs that project to a separate set of MNs, supporting the existence of a separate pathway underlying the control of stiffness.NEW & NOTEWORTHY The characterization of the pathways underlying force generation or stiffness modulation are still unknown. In this study, we demonstrated that the common input to motor neurons of antagonist muscles shows a high-frequency component when muscles are coactivated to modulate stiffness but not to generate force. Our results provide novel insights on the neural strategies for the recruitment of multiple muscles by identifying specific spectral characteristics of the synaptic inputs underlying functionally different tasks.
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Affiliation(s)
- Daniele Borzelli
- Department of Biomedical, Dental, Morphological and Functional Imaging Sciences, University of Messina, Messina, Italy
- Laboratory of Neuromotor Physiology, IRCCS Santa Lucia Foundation, Rome, Italy
| | - Taian M M Vieira
- Laboratory for Engineering of the Neuromuscular System, Department of Electronics and Telecommunications, Politecnico di Torino, Turin, Italy
- PoliToBIOMed Lab, Politecnico di Torino, Turin, Italy
| | - Alberto Botter
- Laboratory for Engineering of the Neuromuscular System, Department of Electronics and Telecommunications, Politecnico di Torino, Turin, Italy
- PoliToBIOMed Lab, Politecnico di Torino, Turin, Italy
| | - Marco Gazzoni
- Laboratory for Engineering of the Neuromuscular System, Department of Electronics and Telecommunications, Politecnico di Torino, Turin, Italy
- PoliToBIOMed Lab, Politecnico di Torino, Turin, Italy
| | - Francesco Lacquaniti
- Laboratory of Neuromotor Physiology, IRCCS Santa Lucia Foundation, Rome, Italy
- Department of Systems Medicine and Center of Space BioMedicine, University of Rome Tor Vergata, Rome, Italy
| | - Andrea d'Avella
- Department of Biomedical, Dental, Morphological and Functional Imaging Sciences, University of Messina, Messina, Italy
- Laboratory of Neuromotor Physiology, IRCCS Santa Lucia Foundation, Rome, Italy
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Defferriere T, Helal AS, Li J, Rupp JLM, Tuller HL. Ionic Conduction-Based Polycrystalline Oxide Gamma Ray Detection - Radiation-Ionic Effects. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2309253. [PMID: 38380958 DOI: 10.1002/adma.202309253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Revised: 01/26/2024] [Indexed: 02/22/2024]
Abstract
Newly discovered opto-ionic effects in metal oxides provide unique opportunities for functional ceramic applications. The authors generalize the recently demonstrated grain boundary opto-ionic effect observed in solid electrolyte thin films under ultraviolet (UV) irradiation to a radiation-ionic effect that can be applied to bulk materials and used for gamma-rays (γ-rays) detection. Near room temperature, lightly doped Gd-doped CeO2, a polycrystalline ion conducting ceramic, exhibits a resistance ratio change ≈103 and reversible response in ionic current when exposed to 60Co γ-ray (1.1 and 1.3 MeV). This is attributed to the steady state passivation of space charge barriers at grain boundaries, that act as virtual electrodes, capturing radiation-induced electrons, in turn lowering space charge barrier heights, and thereby exclusively modulating the ionic carrier flow within the ceramic electrolytes. Such behavior allows significant electrical response under low fields, that is, < 2 V cm-1, paving the way to inexpensive, sensitive, low-power, and miniaturizable solid-state devices, uniquely suited for operating in harsh (high temperature, pressure, and corrosive) environments. This discovery presents opportunities for portable and/or scalable radiation detectors benefiting geothermal drilling, small modular reactors, nuclear security, and waste management.
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Affiliation(s)
- Thomas Defferriere
- Department of Material Science and Engineering, MIT, Cambridge, MA, 02139, USA
| | - Ahmed Sami Helal
- Department of Nuclear Science and Engineering, MIT, Cambridge, MA, 02139, USA
- Nuclear Materials Authority, Katameya, 3rd Settlement, Cairo, 11936, Egypt
| | - Ju Li
- Department of Material Science and Engineering, MIT, Cambridge, MA, 02139, USA
- Department of Nuclear Science and Engineering, MIT, Cambridge, MA, 02139, USA
| | - Jennifer L M Rupp
- Department of Material Science and Engineering, MIT, Cambridge, MA, 02139, USA
- Department of Chemistry, Technical University Munich, 85748, Garching, Germany
- Department of Electrical Engineering and Computer Science, MIT, Cambridge, MA, 02139, USA
- TUMint. Energy Research GmbH, Lichtenbergstr. 4, 85747, Garching, Germany
| | - Harry L Tuller
- Department of Material Science and Engineering, MIT, Cambridge, MA, 02139, USA
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Guo Y, Jones EJ, Škarabot J, Inns TB, Phillips BE, Atherton PJ, Piasecki M. Common synaptic inputs and persistent inward currents of vastus lateralis motor units are reduced in older male adults. GeroScience 2024; 46:3249-3261. [PMID: 38238546 PMCID: PMC11009172 DOI: 10.1007/s11357-024-01063-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Accepted: 01/02/2024] [Indexed: 04/13/2024] Open
Abstract
Although muscle atrophy may partially account for age-related strength decline, it is further influenced by alterations of neural input to muscle. Persistent inward currents (PIC) and the level of common synaptic inputs to motoneurons influence neuromuscular function. However, these have not yet been described in the aged human quadriceps. High-density surface electromyography (HDsEMG) signals were collected from the vastus lateralis of 15 young (mean ± SD, 23 ± 5 y) and 15 older (67 ± 9 y) men during submaximal sustained and 20-s ramped contractions. HDsEMG signals were decomposed to identify individual motor unit discharges, from which PIC amplitude and intramuscular coherence were estimated. Older participants produced significantly lower knee extensor torque (p < 0.001) and poorer force tracking ability (p < 0.001) than young. Older participants also had lower PIC amplitude (p = 0.001) and coherence estimates in the alpha frequency band (p < 0.001) during ramp contractions when compared to young. Persistent inward currents and common synaptic inputs are lower in the vastus lateralis of older males when compared to young. These data highlight altered neural input to the clinically and functionally important quadriceps, further underpinning age-related loss of function which may occur independently of the loss of muscle mass.
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Affiliation(s)
- Yuxiao Guo
- Centre of Metabolism, Ageing & Physiology (COMAP), MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research &, National Institute for Health Research (NIHR) Nottingham Biomedical Research Centre, School of Medicine, University of Nottingham, Royal Derby Hospital Centre (Room 3011), Derby, DE22 3DT, UK
| | - Eleanor J Jones
- Centre of Metabolism, Ageing & Physiology (COMAP), MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research &, National Institute for Health Research (NIHR) Nottingham Biomedical Research Centre, School of Medicine, University of Nottingham, Royal Derby Hospital Centre (Room 3011), Derby, DE22 3DT, UK
| | - Jakob Škarabot
- School of Sport, Exercise and Health Sciences, Loughborough University, Loughborough, UK
| | - Thomas B Inns
- Centre of Metabolism, Ageing & Physiology (COMAP), MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research &, National Institute for Health Research (NIHR) Nottingham Biomedical Research Centre, School of Medicine, University of Nottingham, Royal Derby Hospital Centre (Room 3011), Derby, DE22 3DT, UK
| | - Bethan E Phillips
- Centre of Metabolism, Ageing & Physiology (COMAP), MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research &, National Institute for Health Research (NIHR) Nottingham Biomedical Research Centre, School of Medicine, University of Nottingham, Royal Derby Hospital Centre (Room 3011), Derby, DE22 3DT, UK
| | - Philip J Atherton
- Centre of Metabolism, Ageing & Physiology (COMAP), MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research &, National Institute for Health Research (NIHR) Nottingham Biomedical Research Centre, School of Medicine, University of Nottingham, Royal Derby Hospital Centre (Room 3011), Derby, DE22 3DT, UK
| | - Mathew Piasecki
- Centre of Metabolism, Ageing & Physiology (COMAP), MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research &, National Institute for Health Research (NIHR) Nottingham Biomedical Research Centre, School of Medicine, University of Nottingham, Royal Derby Hospital Centre (Room 3011), Derby, DE22 3DT, UK.
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Glass SM, Morelli R, Mellinger E, Delaney C, Plassmann C, Kolb C, Parcetich KM. Acute responses of postural alignment and intermuscular coherence to anti-gravitational muscle engagement-A randomized crossover trial. J Bodyw Mov Ther 2024; 38:133-142. [PMID: 38763552 DOI: 10.1016/j.jbmt.2023.10.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Revised: 09/03/2023] [Accepted: 10/03/2023] [Indexed: 05/21/2024]
Abstract
INTRODUCTION Posture is a facet of clinical assessment in several rehabilitative disciplines. Despite extensive clinical focus, the precision with which posture can be evaluated and intervened upon is limited by the very general terms used to describe it. The purpose of this crossover trial was to quantify the effects of targeted postural intervention motivated by theoretical sagittal gravitational collapsing (SGC) tendencies on: 1) distance from SGC, 2) intermuscular coherence (iCOH), and 3) kinematic chain connectivity. METHODS Ten healthy adults (24.50 ± 1.18 years, 172.72 ± 10.19 cm, 76.47 ± 14.60 kg) completed pre- and post-intervention testing on two occasions involving contrasting interventions: promote postural muscle (PPM) vs. reduce compensatory muscle (RCM) engagement. Distance from SGC, iCOH, and kinematic chain connectivity were quantified from electromyography and/or kinematic data acquired during tests administered before and after interventions. Effects of Treatment [PPM, RCM] and Time [Pre, Post] were tested with linear mixed models. RESULTS A Treatment*Time interaction was observed for distance from SGC. Post-intervention distance from SGC was greater following PPM only (p < 0.01). A Treatment*Time interaction was observed for hi-frequency trunk muscle iCOH, with a post-intervention increase corresponding to the RCM intervention (p < 0.007). Additional iCOH effects did not differ by intervention. CONCLUSION Distance from SGC is acutely modifiable and increases following exercises to facilitate anti-SGC muscles. Convergent findings related to kinematic chain connectivity and prescriptive neural binding were not observed. These observations suggest that it may be possible to describe, evaluate, and intervene upon posture in reference to a specific, mechanistic theory regarding the function of postural alignment.
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Affiliation(s)
- Stephen M Glass
- Department of Physical Therapy, Radford University Carilion, Roanoke, VA, 24013, USA.
| | - Ryan Morelli
- Department of Physical Therapy, Radford University Carilion, Roanoke, VA, 24013, USA
| | - Emily Mellinger
- Department of Physical Therapy, Radford University Carilion, Roanoke, VA, 24013, USA
| | - Caitlyn Delaney
- Department of Physical Therapy, Radford University Carilion, Roanoke, VA, 24013, USA
| | - Christine Plassmann
- Department of Physical Therapy, Radford University Carilion, Roanoke, VA, 24013, USA
| | - Caleb Kolb
- Department of Physical Therapy, Radford University Carilion, Roanoke, VA, 24013, USA
| | - Kevin M Parcetich
- Department of Physical Therapy, Radford University Carilion, Roanoke, VA, 24013, USA
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Silsby M, Yiannikas C, Fois AF, Kennerson ML, Kiernan MC, Fung VSC, Vucic S. Upper and lower limb tremor in Charcot-Marie-Tooth neuropathy type 1A and the implications for standing balance. J Neurol 2024; 271:1776-1786. [PMID: 38051345 PMCID: PMC10972941 DOI: 10.1007/s00415-023-12124-z] [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: 09/25/2023] [Revised: 11/17/2023] [Accepted: 11/18/2023] [Indexed: 12/07/2023]
Abstract
BACKGROUND Neuropathic tremor occurs in Charcot-Marie-Tooth neuropathy type 1A (CMT1A; hereditary motor and sensory neuropathy, HMSN), although the pathophysiological mechanisms remain to be elucidated. Separately, lower limb tremor has not been explored in CMT1A and could be associated with imbalance as in other neuropathies. The present study aimed to determine tremor characteristics in the upper and lower limbs in CMT1A and relate these findings to clinical disability, particularly imbalance. METHODS Tremor and posturography studies were undertaken in phenotyped and genotyped CMT1A patients. Participants underwent detailed clinical assessment, tremor study recordings, and nerve conduction studies. Tremor stability index was calculated for upper limb tremor and compared to essential tremor. RESULTS Seventeen patients were enrolled. Postural and kinetic upper limb tremors were evident in 65%, while postural and orthostatic lower limb tremors were seen in 35% of CMT1A patients. Peak upper limb frequencies were lower distally (~ 6 Hz) and higher proximally (~ 9 Hz), were unchanged by weight-loading, and not impacted by fatigue. The tremor stability index was significantly higher in CMT1A than in essential tremor. A 5-6 Hz lower limb tremor was recorded which did not vary along the limb and was unaffected by fatigue. Balance was impaired in patients with postural lower limb tremor. A high frequency peak on posturography was associated with 'good' balance. CONCLUSIONS Tremor is a common clinical feature in CMT1A, distinct from essential tremor, mediated by a complex interaction between peripheral and central mechanisms. Postural lower limb tremor is associated with imbalance; strategies aimed at tremor modulation could be of therapeutic utility.
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Affiliation(s)
- Matthew Silsby
- Neurology Department, Westmead Hospital, Westmead Clinical School, University of Sydney, Sydney, NSW, Australia
- Brain and Nerve Research Centre, University of Sydney, Concord, NSW, Australia
- Neurology Department, Concord Hospital, Sydney, NSW, Australia
| | - Con Yiannikas
- Neurology Department, Concord Hospital, Sydney, NSW, Australia
- Neurology Department, Royal North Shore Hospital, Sydney, NSW, Australia
| | - Alessandro F Fois
- Neurology Department, Westmead Hospital, Westmead Clinical School, University of Sydney, Sydney, NSW, Australia
| | - Marina L Kennerson
- Northcott Neuroscience Laboratory, ANZAC Research Institute, University of Sydney, Sydney, NSW, Australia
- Molecular Medicine Laboratory, Concord Hospital, Concord, NSW, Australia
| | - Matthew C Kiernan
- Neurology Department, Royal Prince Alfred Hospital Sydney, Sydney, NSW, Australia
- Brain and Mind Centre, University of Sydney, Camperdown, NSW, Australia
| | - Victor S C Fung
- Neurology Department, Westmead Hospital, Westmead Clinical School, University of Sydney, Sydney, NSW, Australia
| | - Steve Vucic
- Brain and Nerve Research Centre, University of Sydney, Concord, NSW, Australia.
- Neurology Department, Concord Hospital, Sydney, NSW, Australia.
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Lai J, Ye Y, Huang D, Zhang X. Age-related differences in the capacity and neuromuscular control of the foot core system during quiet standing. Scand J Med Sci Sports 2024; 34:e14522. [PMID: 37872662 DOI: 10.1111/sms.14522] [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: 04/15/2023] [Revised: 09/08/2023] [Accepted: 09/29/2023] [Indexed: 10/25/2023]
Abstract
The foot core system is essential for upright stability. However, aging-induced changes in the foot core function remain poorly understood. The present study aimed to examine age-related differences in postural stability from the perspective of foot core capacity and neuromuscular control during quiet standing. Thirty-six older and 25 young adults completed foot core capacity tests including toe flexion strength, muscle ultrasonography, and plantar cutaneous sensitivity. The center of pressure (COP) and electromyography (EMG) of abductor hallucis (ABH), peroneus longus (PL), tibialis anterior (TA) and medial gastrocnemius (GM) were simultaneously recorded during double-leg and single-leg standing (SLS). EMG data were used to calculate muscle synergy and intermuscular coherence across three frequency bands. Compared to young adults, older adults exhibited thinner hallucis flexors, weaker toe strength, and lower plantar cutaneous sensitivity. The ABH thickness and plantar cutaneous sensitivity were negatively associated with the COP mean peak velocity in older adults, but not in young adults. Besides, older adults had higher cocontraction of muscles spanning the arch (ABH-PL) and ankle (TA-GM), and had lower beta- and gamma-band coherence of the ABH-PL and TA-PL during SLS. Foot core capacities became compromised with advancing age, and the balance control of older adults was susceptible to foot core than young adults in balance tasks. To compensate for the weakened foot core, older adults may adopt arch and ankle stiffening strategies via increasing muscle cocontraction. Furthermore, coherence analysis indicated that aging may increase the demand for cortical brain resources during SLS.
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Affiliation(s)
- Jiaqi Lai
- School of Biomedical Engineering, Shenzhen Campus of Sun Yat-sen University, Shenzhen, China
- Key Laboratory of Sensing Technology and Biomedical Instrument of Guangdong Province, School of Biomedical Engineering, Sun Yat-sen University, Guangzhou, China
| | - Yinyan Ye
- Department of Rehabilitation Medicine, The Seventh Affiliated Hospital, Sun Yat-Sen University, Shenzhen, China
| | - Dongfeng Huang
- Department of Rehabilitation Medicine, The Seventh Affiliated Hospital, Sun Yat-Sen University, Shenzhen, China
- Guangdong Engineering and Technology Research Center for Rehabilitation Medicine and Translation, Guangdong, China
| | - Xianyi Zhang
- School of Biomedical Engineering, Shenzhen Campus of Sun Yat-sen University, Shenzhen, China
- Key Laboratory of Sensing Technology and Biomedical Instrument of Guangdong Province, School of Biomedical Engineering, Sun Yat-sen University, Guangzhou, China
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Yamanaka E, Goto R, Kawakami M, Tateishi T, Kondo K, Nojima I. Intermuscular Coherence during Quiet Standing in Sub-Acute Patients after Stroke: An Exploratory Study. Brain Sci 2023; 13:1640. [PMID: 38137088 PMCID: PMC10742243 DOI: 10.3390/brainsci13121640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Revised: 11/09/2023] [Accepted: 11/22/2023] [Indexed: 12/24/2023] Open
Abstract
Asymmetrically impaired standing control is a prevalent disability among stroke patients; however, most of the neuromuscular characteristics are unclear. Therefore, the main purpose of this study was to investigate between-limb differences in intermuscular coherence during quiet standing. Consequently, 15 patients who had sub-acute stroke performed a quiet standing task without assistive devices, and electromyography was measured on the bilateral tibialis anterior (TA), soleus (SL), and medial gastrocnemius (MG). The intermuscular coherence of the unilateral synergistic (SL-MG) pair and unilateral antagonist (TA-SL and TA-MG) pairs in the delta (0-5 Hz) and beta (15-35 Hz) bands were calculated and compared between the paretic and non-paretic limbs. The unilateral synergistic SL-MG coherence in the beta band was significantly greater in the non-paretic limb than in the paretic limb (p = 0.017), while unilateral antagonist TA-MG coherence in the delta band was significantly greater in the paretic limb than in the non-paretic limb (p < 0.01). During quiet standing, stroke patients showed asymmetry in the cortical control of the plantar flexor muscles, and synchronous control between the antagonistic muscles was characteristic of the paretic limb. This study identified abnormal muscle activity patterns and asymmetrical cortical control underlying impaired standing balance in patients with sub-acute stroke using an intermuscular coherence analysis.
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Affiliation(s)
- Eiji Yamanaka
- Department of Health Sciences, Graduate School of Medicine, Shinshu University, 3-1-1 Asahi, Matsumoto 390-8621, Japan;
- Department of Rehabilitation Medicine, Tokyo Bay Rehabilitation Hospital, 4-1-1 Yatsu, Narashino 275-0026, Japan
| | - Ryosuke Goto
- Department of Rehabilitation Medicine, Tokyo Bay Rehabilitation Hospital, 4-1-1 Yatsu, Narashino 275-0026, Japan
| | - Michiyuki Kawakami
- Department of Rehabilitation Medicine, Tokyo Bay Rehabilitation Hospital, 4-1-1 Yatsu, Narashino 275-0026, Japan
- Department of Rehabilitation Medicine, Keio University School of Medicine, 35 Shinano-machi, Shinjuku-ku, Tokyo 160-8582, Japan
| | - Takaki Tateishi
- Department of Rehabilitation Medicine, Tokyo Bay Rehabilitation Hospital, 4-1-1 Yatsu, Narashino 275-0026, Japan
| | - Kunitsugu Kondo
- Department of Rehabilitation Medicine, Tokyo Bay Rehabilitation Hospital, 4-1-1 Yatsu, Narashino 275-0026, Japan
| | - Ippei Nojima
- Department of Health Sciences, Graduate School of Medicine, Shinshu University, 3-1-1 Asahi, Matsumoto 390-8621, Japan;
- Department of Rehabilitation Medicine, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya 467-0001, Japan
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Silsby M, Yiannikas C, Fois AF, Ng K, Kiernan MC, Fung VSC, Vucic S. Imbalance and lower limb tremor in chronic inflammatory demyelinating polyradiculoneuropathy. J Peripher Nerv Syst 2023; 28:415-424. [PMID: 37314215 DOI: 10.1111/jns.12574] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Revised: 06/08/2023] [Accepted: 06/11/2023] [Indexed: 06/15/2023]
Abstract
BACKGROUND AND AIMS Imbalance is a prominent symptom of chronic inflammatory demyelinating polyradiculoneuropathy (CIDP). Although upper limb tremor in CIDP is described, lower limb tremor has not been assessed. The aim of this study was to determine whether lower limb tremor was present in CIDP and assess potential relationships with imbalance. METHODS This was a cross-sectional observational study of prospectively recruited consecutive patients with typical CIDP (N = 25). Clinical phenotyping, lower limb nerve conduction and tremor studies, and posturography analyses were performed. The Berg Balance Scale (BBS) divided CIDP patients into those with "good" and "poor" balance. RESULTS Lower limb tremor was evident in 32% of CIDP patients and associated with poor balance (BBSTremor 35 [23-46], BBSNo Tremor 52 [44-55], p = .035). Tremor frequency was 10.2-12.5 Hz with legs outstretched and on standing, apart from four patients with a lower frequency tremor (3.8-4.6 Hz) while standing. Posturography analysis revealed a high-frequency spectral peak in the vertical axis in 44% of CIDP patients (16.0 ± 0.4 Hz). This was more likely in those with "good" balance (40% vs. 4%, p = .013). INTERPRETATION Lower limb tremor is present in one third of CIDP patients and is associated with poor balance. A high-frequency peak on posturography is associated with better balance in CIDP. Lower limb tremor and posturography assessments could serve as important biomarkers of balance in a clinical setting.
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Affiliation(s)
- Matthew Silsby
- Neurology Department, Westmead Hospital Sydney & Sydney Medical School, University of Sydney, Sydney, NSW, Australia
- Brain and Nerve Research Centre, Concord Hospital, University of Sydney, Sydney, Australia
- Neurology Department, Concord Hospital Sydney, Sydney, Australia
| | - Con Yiannikas
- Neurology Department, Concord Hospital Sydney, Sydney, Australia
- Neurology Department, Royal North Shore Hospital Sydney & Sydney Medical School, University of Sydney, Sydney, Australia
| | - Alessandro F Fois
- Neurology Department, Westmead Hospital Sydney & Sydney Medical School, University of Sydney, Sydney, NSW, Australia
| | - Karl Ng
- Neurology Department, Royal North Shore Hospital Sydney & Sydney Medical School, University of Sydney, Sydney, Australia
| | - Matthew C Kiernan
- Brain and Mind Centre, University of Sydney & Neurology Department, Royal Prince Alfred Hospital, Sydney, Australia
| | - Victor S C Fung
- Neurology Department, Westmead Hospital Sydney & Sydney Medical School, University of Sydney, Sydney, NSW, Australia
| | - Steve Vucic
- Brain and Nerve Research Centre, Concord Hospital, University of Sydney, Sydney, Australia
- Neurology Department, Concord Hospital Sydney, Sydney, Australia
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Yamanaka E, Horiuchi Y, Nojima I. EMG-EMG coherence during voluntary control of human standing tasks: a systematic scoping review. Front Neurosci 2023; 17:1145751. [PMID: 37250422 PMCID: PMC10215561 DOI: 10.3389/fnins.2023.1145751] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Accepted: 04/24/2023] [Indexed: 05/31/2023] Open
Abstract
Background Intra- or inter-muscular (EMG-EMG) coherence is a simple and non-invasive method for estimating central nervous system control during human standing tasks. Although this research area has developed, no systematic literature review has been conducted. Objectives We aimed to map the current literature on EMG-EMG coherence during various standing tasks to identify the research gaps and summarize previous studies comparing EMG-EMG coherence between healthy young and elderly adults. Methods Electronic databases (PubMed, Cochrane Library, and CINAHL) were searched for articles published from inception to December 2021. We incorporated studies that analyzed EMG-EMG coherence of the postural muscles in various standing tasks. Results Finally, 25 articles fulfilled the inclusion criteria and involved 509 participants. Most participants were healthy young adults, while only one study included participants with medical conditions. There was some evidence that EMG-EMG coherence could identify differences in standing control between healthy young and elderly adults, although the methodology was highly heterogeneous. Conclusion The present review indicates that EMG-EMG coherence may help elucidate changes in standing control with age. In future studies, this method should be used in participants with central nervous system disorders to understand better the characteristics of standing balance disabilities.
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Affiliation(s)
- Eiji Yamanaka
- Division of Physical Therapy, Shinshu University School of Health Sciences, Nagano, Japan
- Department of Rehabilitation Medicine, Tokyo Bay Rehabilitation Hospital, Chiba, Japan
| | - Yuki Horiuchi
- Division of Physical Therapy, Shinshu University School of Health Sciences, Nagano, Japan
| | - Ippei Nojima
- Division of Physical Therapy, Shinshu University School of Health Sciences, Nagano, Japan
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11
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Jie LJ, Kal E, Ellmers TJ, Rosier J, Meijer K, Boonstra TW. The Effects of Conscious Movement Processing on the Neuromuscular Control of Posture. Neuroscience 2023; 509:63-73. [PMID: 36403689 DOI: 10.1016/j.neuroscience.2022.11.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Revised: 11/07/2022] [Accepted: 11/10/2022] [Indexed: 11/19/2022]
Abstract
Maintaining balance is thought to primarily occur sub-consciously. Occasionally, however, individuals will direct conscious attention towards balance, e.g., in response to a threat to balance. Such conscious movement processing (CMP) increases the reliance on attentional resources and may disrupt balance performance. However, the underlying changes in neuromuscular control remain poorly understood. We investigated the effects of CMP (manipulated using verbal instructions) on neural control of posture in twenty-five adults (11 females, mean age = 23.9, range = 18-33). Participants performed 90-s, bipedal stance balance trials in high- and low-CMP conditions, during both stable (solid surface) and unstable (foam) task conditions. Postural sway amplitude, frequency and complexity were used to assess postural control. Surface EMG was recorded bilaterally from lower leg muscles (Soleus, Tibialis Anterior, Gastrocnemius Medialis, Peroneus Longus) and intermuscular coherence (IMC) was assessed for 12 muscle pairs across four frequency bands. We observed significantly increased sway amplitude, and decreased sway frequency and complexity in the high- compared to the low-CMP conditions. All sway variables increased in the unstable compared to the stable conditions. We observed reduced beta band IMC between several muscle pairs during high- compared to low-CMP, but these findings did not remain significant after controlling for multiple comparisons. Finally, IMC significantly increased in the unstable conditions for most muscle combinations and frequency bands. In all, results tentatively suggest that CMP-induced changes in sway outcomes may be facilitated by reduced beta-band IMC, but these findings need to be replicated before they can be interpreted more conclusively.
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Affiliation(s)
- Li-Juan Jie
- Department of Nutrition and Movement Sciences, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, the Netherlands; Research Centre for Nutrition, Lifestyle and Exercise, Zuyd University of Applied Sciences, the Netherlands.
| | - Elmar Kal
- College of Health, Medicine and Life Sciences, Brunel University London, UK; Centre for Cognitive Neuroscience, Brunel University London, UK
| | - Toby J Ellmers
- Centre for Vestibular Neurology, Imperial College London, UK
| | - Joëlle Rosier
- Department of Nutrition and Movement Sciences, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, the Netherlands
| | - Kenneth Meijer
- Department of Nutrition and Movement Sciences, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, the Netherlands
| | - Tjeerd W Boonstra
- Department of Neuropsychology and Psychopharmacology, Faculty of Psychology and Neuroscience, Maastricht University, the Netherlands
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12
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Sensorimotor recalibration of postural control strategies occurs after whole body vibration. Sci Rep 2023; 13:522. [PMID: 36627328 PMCID: PMC9831994 DOI: 10.1038/s41598-022-27117-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Accepted: 12/26/2022] [Indexed: 01/11/2023] Open
Abstract
Efficient postural control results from an effective interplay between sensory feedbacks integration and muscle modulation and can be affected by ageing and neuromuscular injuries. With this study, we investigated the effect of whole-body vibratory stimulation on postural control strategies employed to maintain an upright posture. We explored both physiological and posturography metrics, through corticomuscular and intramuscular coherence, and muscle networks analyses. The stimulation disrupts balance in the short term, but leads to a greater contribution of cortical activity, necessary to modulate muscle activation via the formation of (new) synergies. We also observed a reconfiguration of muscle recruitment patterns that returned to pre-stimulation levels after few minutes, accompanied by a slight improvement of balance in the anterior-posterior direction. Our results suggest that, in the context of postural control, appropriate mechanical stimulation is capable of triggering a recalibration of the sensorimotor set and might offer new perspectives for motor re-education.
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13
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Ojha A, Alderink G, Rhodes S. Coherence between electromyographic signals of anterior tibialis, soleus, and gastrocnemius during standing balance tasks. Front Hum Neurosci 2023; 17:1042758. [PMID: 37144163 PMCID: PMC10151522 DOI: 10.3389/fnhum.2023.1042758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Accepted: 03/31/2023] [Indexed: 05/06/2023] Open
Abstract
Introduction Knowledge about the mechanics and physiological features of balance for healthy individuals enhances understanding of impairments of balance related to neuropathology secondary to aging, diseases of the central nervous system (CNS), and traumatic brain injury, such as concussion. Methods We examined the neural correlations during muscle activation related to quiet standing from the intermuscular coherence in different neural frequency bands. Electromyography (EMG) signals were recorded from six healthy participants (fs = 1,200 Hz for 30 s) from three different muscles bilaterally: anterior tibialis, medial gastrocnemius, and soleus. Data were collected for four different postural stability conditions. In decreasing order of stability these were feet together eyes open, feet together eyes closed, tandem eyes open, and tandem eyes closed. Wavelet decomposition was used to extract the neural frequency bands: gamma, beta, alpha, theta, and delta. Magnitude-squared-coherence (MSC) was computed between different muscle pairs for each of the stability conditions. Results and discussion There was greater coherence between muscle pairs in the same leg. Coherence was greater in lower frequency bands. For all frequency bands, the standard deviation of coherence between different muscle pairs was always higher in the less stable positions. Time-frequency coherence spectrograms also showed higher intermuscular coherence for muscle pairs in the same leg and in less stable positions. Our data suggest that coherence between EMG signals may be used as an independent indicator of the neural correlates for stability.
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Affiliation(s)
- Anuj Ojha
- School of Engineering, Grand Valley State University, Grand Rapids, MI, United States
| | - Gordon Alderink
- Department of Physical Therapy and Athletic Training, Grand Valley State University, Grand Rapids, MI, United States
| | - Samhita Rhodes
- School of Engineering, Grand Valley State University, Grand Rapids, MI, United States
- *Correspondence: Samhita Rhodes,
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14
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Sozzi S, Schieppati M. Balance Adaptation While Standing on a Compliant Base Depends on the Current Sensory Condition in Healthy Young Adults. Front Hum Neurosci 2022; 16:839799. [PMID: 35399363 PMCID: PMC8989851 DOI: 10.3389/fnhum.2022.839799] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Accepted: 02/03/2022] [Indexed: 01/06/2023] Open
Abstract
Background Several investigations have addressed the process of balance adaptation to external perturbations. The adaptation during unperturbed stance has received little attention. Further, whether the current sensory conditions affect the adaptation rate has not been established. We have addressed the role of vision and haptic feedback on adaptation while standing on foam. Methods In 22 young subjects, the analysis of geometric (path length and sway area) and spectral variables (median frequency and mean level of both total spectrum and selected frequency windows) of the oscillation of the centre of feet pressure (CoP) identified the effects of vision, light-touch (LT) or both in the anteroposterior (AP) and mediolateral (ML) direction over 8 consecutive 90 s standing trials. Results Adaptation was obvious without vision (eyes closed; EC) and tenuous with vision (eyes open; EO). With trial repetition, path length and median frequency diminished with EC (p < 0.001) while sway area and mean level of the spectrum increased (p < 0.001). The low- and high-frequency range of the spectrum increased and decreased in AP and ML directions, respectively. Touch compared to no-touch enhanced the rate of increase of the low-frequency power (p < 0.05). Spectral differences in distinct sensory conditions persisted after adaptation. Conclusion Balance adaptation occurs during standing on foam. Adaptation leads to a progressive increase in the amplitude of the lowest frequencies of the spectrum and a concurrent decrease in the high-frequency range. Within this common behaviour, touch adds to its stabilising action a modest effect on the adaptation rate. Stabilisation is improved by favouring slow oscillations at the expense of sway minimisation. These findings are preliminary to investigations of balance problems in persons with sensory deficits, ageing, and peripheral or central nervous lesion.
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Affiliation(s)
- Stefania Sozzi
- Centro Studi Attività Motorie (CSAM), Istituti Clinici Scientifici Maugeri SB (IRCCS), Pavia, Italy
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15
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Ohtsuka H, Nakajima T, Komiyama T, Suzuki S, Irie S, Ariyasu R. Execution of natural manipulation in the air enhances the beta-rhythm intermuscular coherences of the human arm depending on muscle pairs. J Neurophysiol 2022; 127:946-957. [PMID: 35294314 DOI: 10.1152/jn.00421.2021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Natural manipulation tasks in air consist of two kinematic components: a grasping component, with activation of the hand muscles, and a lifting component, with activation of the proximal muscles. However, it remains unclear whether the synchronized motor commands to the hand/proximal arm muscles are divergently controlled during the task. Therefore, we examined how intermuscular coherence was modulated depending on the muscle combinations during grip and lift (G&L) tasks. Electromyograms (EMGs) were recorded from the biceps brachii (BB), triceps brachii (TB), flexor digitorum superficialis (FDS), and extensor digitorum communis (EDC) muscles. The participants were required to maintain G&L tasks involving a small cubical box with the thumb and index and middle fingers. Consequently, we found that the beta-rhythm coherence (15-35 Hz) in BB-TB, BB-FDS, and TB-EDC pairs during G&L was significantly larger than that during the isolated task with cocontraction of the two target muscles but not BB-EDC, TB-FDS, and FDS-EDC (task and muscle pair specificities). These increases in beta-rhythm coherence were also observed in intramuscular EMG recordings. Furthermore, the results from the execution of several mimic G&L tasks revealed that the separated task-related motor signals and combinations between the motor signals/sensations of the fingertips or object load had minor contributions to the increase in the coherence. These results suggest that during G&L the central nervous system regulates synchronous drive onto motoneurons depending on the muscle pairs and that the multiple combination effect of the sensations of touch/object load and motor signals in the task promotes the synchrony of these pairs.NEW & NOTEWORTHY Natural manipulation in air consists of two kinematic components: grasping, with activation of hand muscles, and lifting, with activation of proximal muscles. We show that during the maintenance of object manipulation in air the central nervous system regulates the synchronous drive onto human motoneuron pools depending on the hand/proximal muscle pairs and that the multiple combination effect of the sensations of touch/object load and motor signals in the task promotes the synchrony of these pairs.
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Affiliation(s)
- Hiroyuki Ohtsuka
- Department of Integrative Physiology, Kyorin University School of Medicine, Mitaka City, Tokyo, Japan.,Department of Physical Therapy, Showa University School of Nursing and Rehabilitation Sciences, Yokohama City, Kanagawa, Japan
| | - Tsuyoshi Nakajima
- Department of Integrative Physiology, Kyorin University School of Medicine, Mitaka City, Tokyo, Japan
| | - Tomoyoshi Komiyama
- Division of Health and Sports Sciences, Faculty of Education, Chiba University, Chiba City, Chiba, Japan.,Division of Health and Sports Education, The United Graduate School of Education, Tokyo Gakugei University, Koganei City, Tokyo, Japan
| | - Shinya Suzuki
- Department of Integrative Physiology, Kyorin University School of Medicine, Mitaka City, Tokyo, Japan
| | - Shun Irie
- Department of Integrative Physiology, Kyorin University School of Medicine, Mitaka City, Tokyo, Japan
| | - Ryohei Ariyasu
- Department of Integrative Physiology, Kyorin University School of Medicine, Mitaka City, Tokyo, Japan
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16
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Krauskopf T, Lauck TB, Klein L, Beusterien ML, Mueller M, Von Tscharner V, Mehring C, Herget GW, Stieglitz T, Pasluosta C. Unilateral transfemoral amputees exhibit altered strength and dynamics of muscular co-activation modulated by visual feedback. J Neural Eng 2022; 19. [PMID: 35100571 DOI: 10.1088/1741-2552/ac5091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2021] [Accepted: 01/31/2022] [Indexed: 11/11/2022]
Abstract
OBJECTIVE Somatosensory perception is disrupted in patients with a lower limb amputation. This increases the difficulty to maintain balance and leads to the development of neuromuscular adjustments. We investigated how these adjustments are reflected in the co-activation of lower body muscles and are modulated by visual feedback. APPROACH We measured electromyography (EMG) signals of muscles from the trunk (erector spinae and obliquus external), and the lower intact/dominant leg (tibialis anterior and medial gastrocnemius) in eleven unilateral transfemoral amputees and eleven age-matched able-bodied controls during 30 seconds of upright standing with and without visual feedback. Muscle synergies involved in balance control were investigated using wavelet coherence analysis. We focused on 7 frequencies grouped in three frequency bands, a low-frequency band (7.56 and 19.86 Hz) representing more sub-cortical and spinal inputs to the muscles, a mid-frequency band (38.26 and 62.63 Hz) representing more cortical inputs, and a high-frequency band (92.90, 129 and 170.90 Hz) associated with synchronizing motor unit action potentials. Further, the dynamics of changes in intermuscular coupling over time were quantified using the Entropic Half-Life. MAIN RESULTS Amputees exhibited lower coherency values when vision was removed at 7.56 Hz for the muscle pair of the lower leg. At this frequency, the coherency values of the amputee group also differed from controls for the eyes closed condition. Controls and amputees exhibited opposite coherent behaviors with visual feedback at 7.56 Hz. For the eyes open condition at 129 Hz, the coherency values of amputees and controls differed for the muscle pair of the trunk, and at 170.90 Hz for the muscle pair of the lower leg. Amputees exhibited different dynamics of muscle co-activation at the low frequency band when vision was available. SIGNIFICANCE Altogether, these findings point to the development of neuromuscular adaptations reflected in the strength and dynamics of muscular co-activation.
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Affiliation(s)
- Thomas Krauskopf
- Laboratory for Biomedical Micro-technology, Department of Microsystem Engineering (IMTEK), University of Freiburg, Georges-Koehler-Allee 201, Freiburg im Breisgau, Baden-Württemberg, 79110, GERMANY
| | - Torben B Lauck
- Laboratory for Biomedical Microtechnology, Department of Microsystem Engineering (IMTEK) , University of Freiburg, Georges-Koehler-Allee 201, Freiburg im Breisgau, Baden-Württemberg, 79110, GERMANY
| | - Lukas Klein
- Department of Orthopaedics and Trauma Surgery, Medical Center-University of Freiburg, Hugstetter Straße 55, Freiburg, Baden-Württemberg, 79106, GERMANY
| | - Marvin L Beusterien
- Laboratory for Biomedical Micro-technology, Department of Microsystem Engineering (IMTEK), University of Freiburg, Georges-Koehler-Allee 201, Freiburg im Breisgau, Baden-Württemberg, 79110, GERMANY
| | - Marc Mueller
- Sanitaetshaus Pfaender, Munzinger Straße 5c, Freiburg, 79111, GERMANY
| | | | - Carsten Mehring
- Institute of Biology III & Bernstein Centre , University of Freiburg, Hansastr. 9a, Freiburg im Breisgau, Baden-Württemberg, 79098, GERMANY
| | - Georg W Herget
- Department of Orthopaedics and Trauma Surgery, Medical Center-University of Freiburg, Hugstetter Straße 55, Freiburg, Baden-Württemberg, 79106, GERMANY
| | - Thomas Stieglitz
- Laboratory for Biomedical Micro-technology, Department of Microsystem Engineering (IMTEK), University of Freiburg, Georges-Köhler-Allee 201, Freiburg im Breisgau, Baden-Württemberg, 79110, GERMANY
| | - Cristian Pasluosta
- Laboratory for Biomedical Micro-technology, Department of Microsystem Engineering (IMTEK), University of Freiburg, Georges-Koehler-Allee 201, Freiburg im Breisgau, Baden-Württemberg, 79110, GERMANY
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17
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Glass SM, Wildman L, Brummitt C, Ratchford K, Westbrook GM, Aron A. Effects of global postural alignment on posture-stabilizing synergy and intermuscular coherence in bipedal standing. Exp Brain Res 2022; 240:841-851. [DOI: 10.1007/s00221-021-06291-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Accepted: 12/14/2021] [Indexed: 11/24/2022]
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18
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Zaback M, Adkin AL, Chua R, Timothy Inglis J, Carpenter MG. Facilitation and habituation of cortical and subcortical control of standing balance following repeated exposure to a height-related postural threat. Neuroscience 2022; 487:8-25. [DOI: 10.1016/j.neuroscience.2022.01.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2021] [Revised: 12/23/2021] [Accepted: 01/17/2022] [Indexed: 01/21/2023]
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19
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Rubin N, Liu W, Hu X, Huang HH. Common Neural Input within and across Lower Limb Muscles: A Preliminary Study. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2021; 2021:6683-6686. [PMID: 34892641 DOI: 10.1109/embc46164.2021.9630141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Motor units (MUs) are the basic unit of motor control. MU synchronization has been evaluated to identify common inputs in neural circuitry during motor coordination. Recent studies have compared common inputs between muscles in the lower limb, but further investigation is needed to compare common inputs to MUs both within a muscle and between MUs of different muscle pairs. The goal of this preliminary study was to characterize levels of common inputs to MUs in three muscle groups: MUs within a muscle, between bilateral homologous pairs, and between agonist/antagonist muscle pairs. To achieve this, surface electromyography (EMG) was recorded during bilateral ankle dorsiflexion and plantarflexion on the right and left tibiales anterior (RTA, LTA) and gastrocnemii (RGA, LGA) muscles. After decomposing EMG into active MU firings, we conducted coherence analyses of composite MU spike trains (CSTs) in each muscle group in both the beta (13-30 Hz) and gamma (30-60 Hz) frequency bands. Our results indicate MUs within a muscle have the greatest levels of common input, with decreasing levels of common input to bilateral and agonist/antagonist muscle pairs, respectively. Additionally, each muscle group exhibited similar levels of common input between the beta and gamma bands. This work may provide a way to unveil mechanisms of functional coordination in the lower limb across motor tasks.
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Bakker LBM, Nandi T, Lamoth CJC, Hortobágyi T. Task specificity and neural adaptations after balance learning in young adults. Hum Mov Sci 2021; 78:102833. [PMID: 34175684 DOI: 10.1016/j.humov.2021.102833] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Revised: 05/11/2021] [Accepted: 06/17/2021] [Indexed: 10/21/2022]
Affiliation(s)
- Lisanne B M Bakker
- University of Groningen, University Medical Center Groningen, the Netherlands,.
| | - Tulika Nandi
- Nuffield Department of Clinical Neurosciences, University of Oxford, United Kingdom
| | - Claudine J C Lamoth
- University of Groningen, University Medical Center Groningen, the Netherlands
| | - Tibor Hortobágyi
- University of Groningen, University Medical Center Groningen, the Netherlands,; Institute of Sport Sciences and Physical Education, Faculty of Sciences, University of Pécs, Pécs, Hungary; Somogy County Kaposi Mór Teaching Hospital, Kaposvár, Hungary
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21
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Dos Santos PCR, Lamoth CJC, Barbieri FA, Zijdewind I, Gobbi LTB, Hortobágyi T. Age-specific modulation of intermuscular beta coherence during gait before and after experimentally induced fatigue. Sci Rep 2020; 10:15854. [PMID: 32985547 PMCID: PMC7522269 DOI: 10.1038/s41598-020-72839-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Accepted: 09/07/2020] [Indexed: 12/19/2022] Open
Abstract
We examined the effects of age on intermuscular beta-band (15-35 Hz) coherence during treadmill walking before and after experimentally induced fatigue. Older (n = 12) and younger (n = 12) adults walked on a treadmill at 1.2 m/s for 3 min before and after repetitive sit-to-stand, rSTS, to induce muscle fatigability. We measured stride outcomes and coherence from 100 steps in the dominant leg for the synergistic (biceps femoris (BF)-semitendinosus, rectus femoris (RF)-vastus lateralis (VL), gastrocnemius lateralis (GL)-Soleus (SL), tibialis anterior (TA)-peroneus longus (PL)) and for the antagonistic (RF-BF and TA-GL) muscle pairs at late swing and early stance. Older vs. younger adults had 43-62% lower GL-SL, RF-VL coherence in swing and TA-PL and RF-VL coherence in stance. After rSTS, RF-BF coherence in late swing decreased by ~ 20% and TA-PL increased by 16% independent of age (p = 0.02). Also, GL-SL coherence decreased by ~ 23% and increased by ~ 23% in younger and older, respectively. Age affects the oscillatory coupling between synergistic muscle pairs, delivered presumably via corticospinal tracts, during treadmill walking. Muscle fatigability elicits age-specific changes in the common fluctuations in muscle activity, which could be interpreted as a compensation for muscle fatigability to maintain gait performance.
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Affiliation(s)
- Paulo Cezar Rocha Dos Santos
- Department of Human Movement Sciences, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
- Posture and Gait Studies Laboratory (LEPLO), Institute of Biosciences, Graduate Program in Movement Sciences, São Paulo State University (UNESP), Rio Claro, Brazil.
- Department of Human Movement Sciences, University of Groningen, University Medical Center Groningen, A. Deusinglaan 1, 9713 AV, Groningen, The Netherlands.
| | - Claudine J C Lamoth
- Department of Human Movement Sciences, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Fabio Augusto Barbieri
- Department of Physical Education, Human Movement Research Laboratory (MOVI-LAB), Graduate Program in Movement Sciences, São Paulo State University (UNESP), Bauru, Brazil
| | - Inge Zijdewind
- Department of Biomedical Sciences of Cells and Systems, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Lilian Teresa Bucken Gobbi
- Posture and Gait Studies Laboratory (LEPLO), Institute of Biosciences, Graduate Program in Movement Sciences, São Paulo State University (UNESP), Rio Claro, Brazil
| | - Tibor Hortobágyi
- Department of Human Movement Sciences, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
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Mason J, Howatson G, Frazer AK, Pearce AJ, Jaberzadeh S, Avela J, Kidgell DJ. Modulation of intracortical inhibition and excitation in agonist and antagonist muscles following acute strength training. Eur J Appl Physiol 2019; 119:2185-2199. [DOI: 10.1007/s00421-019-04203-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Accepted: 07/31/2019] [Indexed: 10/26/2022]
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