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Witts EC, Mathews MA, Murray AJ. The locus coeruleus directs sensory-motor reflex amplitude across environmental contexts. Curr Biol 2023; 33:4679-4688.e3. [PMID: 37741282 PMCID: PMC10957397 DOI: 10.1016/j.cub.2023.08.085] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Revised: 07/03/2023] [Accepted: 08/25/2023] [Indexed: 09/25/2023]
Abstract
Purposeful movement across unpredictable environments requires quick, accurate, and contextually appropriate motor corrections in response to disruptions in balance and posture.1,2,3 These responses must respect both the current position and limitations of the body, as well as the surrounding environment,4,5,6 and involve a combination of segmental reflexes in the spinal cord, vestibulospinal and reticulospinal pathways in the brainstem, and forebrain structures such as the motor cortex.7,8,9,10 These motor plans can be heavily influenced by the animal's surrounding environment, even when that environment has no mechanical influence on the perturbation itself. This environmental influence has been considered as cortical in nature, priming motor responses to a perturbation.8,11 Similarly, postural responses can be influenced by environments that alter threat levels in humans.12,13,14,15,16,17,18 Such studies are generally in agreement with work done in the mouse showing that optogenetic stimulation of the lateral vestibular nucleus (LVN) only results in motor responses when the animal is on a balance beam at height and not when walking on the stable surface of a treadmill.10 In general, this ability to flexibly modify postural responses across terrains and environmental conditions is a critically important component of the balance system.19,20 Here we show that LVN-generated motor corrections can be altered by manipulating the surrounding environment. Furthermore, environmental influence on corrections requires noradrenergic signaling from the locus coeruleus, suggesting a potential link between forebrain structures that convey sensory information about the environment and brainstem circuits that generate motor corrections.
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Affiliation(s)
- Emily C Witts
- Sainsbury Wellcome Centre for Neural Circuits and Behaviour, University College London, W1T 4JG London, UK.
| | - Miranda A Mathews
- Sainsbury Wellcome Centre for Neural Circuits and Behaviour, University College London, W1T 4JG London, UK
| | - Andrew J Murray
- Sainsbury Wellcome Centre for Neural Circuits and Behaviour, University College London, W1T 4JG London, UK.
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Cheng Q, Wu M, Wu Y, Hu Y, Kwapong WR, Shi X, Fan Y, Yu X, He J, Wang Z. Weaker Braking Force, A New Marker of Worse Gait Stability in Alzheimer Disease. Front Aging Neurosci 2020; 12:554168. [PMID: 33024432 PMCID: PMC7516124 DOI: 10.3389/fnagi.2020.554168] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Accepted: 08/14/2020] [Indexed: 11/30/2022] Open
Abstract
Background: Braking force is a gait marker associated with gait stability. This study aimed to determine the alteration of braking force and its correlation with gait stability in Alzheimer disease (AD). Methods: A total of 32 AD patients and 32 healthy controls (HCs) were enrolled in this study. Gait parameters (braking force, gait variability, and fall risk) in the walking tests of Free walk, Barrier, and Count backward were measured by JiBuEn® gait analysis system. Gait variability was calculated by the coefficient of variation (COV) of stride time, stance time, and swing time. Results: The braking force of AD was significantly weaker than HCs in three walking tests (P < 0.001, P < 0.001, P = 0.007). Gait variability of AD showed significant elevation than HCs in the walking of Count backward (COVstride: P = 0.013; COVswing: P = 0.006). Fall risk of AD was significantly higher than HCs in three walking tests (P = 0.001, P = 0.001, P = 0.001). Braking force was negatively associated with fall risks in three walking tests (P < 0.001, P < 0.001, P < 0.001). There were significant negative correlations between braking force and gait variability in the walking of Free walk (COVstride: P = 0.018; COVswing: P = 0.013) and Barrier (COVstride: P = 0.002; COVswing: P = 0.001), but not Count backward (COVstride: P = 0.888; COVswing: P = 0.555). Conclusion: Braking force was weaker in AD compared to HCs, reflecting the worse gait stability of AD. Our study suggests that weakening of braking force may be a new gait marker to indicate cognitive and motor impairment and predict fall risk in AD.
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Affiliation(s)
- Qianqian Cheng
- School of Mental Health, Wenzhou Medical University, Wenzhou, China
| | - Mengxuan Wu
- School of Mental Health, Wenzhou Medical University, Wenzhou, China
| | - Yuemin Wu
- Department of Neurology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Yaoyao Hu
- Department of Neurology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | | | - Xiang Shi
- School of Mental Health, Wenzhou Medical University, Wenzhou, China
| | - Yinying Fan
- Wenzhou Yining Geriatric Hospital, Wenzhou, China
| | - Xin Yu
- School of Mental Health, Wenzhou Medical University, Wenzhou, China
| | - Jincai He
- Department of Neurology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Zhen Wang
- Department of Neurology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
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Biomechanical Analysis of Dance for Parkinson’s Disease: A Paradoxical Case Study of Balance and Gait Effects? Explore (NY) 2017; 13:409-413. [DOI: 10.1016/j.explore.2017.03.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2017] [Accepted: 03/13/2017] [Indexed: 11/24/2022]
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Godi M, Giardini M, Nardone A, Turcato AM, Caligari M, Pisano F, Schieppati M. Curved Walking Rehabilitation with a Rotating Treadmill in Patients with Parkinson's Disease: A Proof of Concept. Front Neurol 2017; 8:53. [PMID: 28293213 PMCID: PMC5329030 DOI: 10.3389/fneur.2017.00053] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Accepted: 02/06/2017] [Indexed: 12/20/2022] Open
Abstract
Training subjects to step-in-place eyes open on a rotating platform while maintaining a fixed body orientation in space [podokinetic stimulation (PKS)] produces a posteffect consisting in inadvertent turning around while stepping-in-place eyes closed [podokinetic after-rotation (PKAR)]. Since the rationale for rehabilitation of curved walking in Parkinson's disease is not fully known, we tested the hypothesis that repeated PKS favors the production of curved walking in these patients, who are uneasy with turning, even when straight walking is little affected. Fifteen patients participated in 10 training sessions distributed in 3 weeks. Both counterclockwise and clockwise PKS were randomly administered in each session. PKS velocity and duration were gradually increased over sessions. The velocity and duration of the following PKAR were assessed. All patients showed PKAR, which increased progressively in peak velocity and duration. In addition, before and at the end of the treatment, all patients walked overground along linear and circular trajectories. Post-training, the velocity of walking bouts increased, more so for the circular than the linear trajectory. Cadence was not affected. This study has shown that parkinsonian patients learn to produce turning while stepping when faced with appropriate training and that this capacity translates into improved overground curved walking.
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Affiliation(s)
- Marco Godi
- Istituti Clinici Scientifici Maugeri Spa SB, IRCCS, Division of Physical Medicine and Rehabilitation, Scientific Institute of Veruno , Veruno , Italy
| | - Marica Giardini
- Department of Translational Medicine, University of Eastern Piedmont , Novara , Italy
| | - Antonio Nardone
- Department of Translational Medicine, University of Eastern Piedmont, Novara, Italy; Istituti Clinici Scientifici Maugeri Spa SB, IRCCS, Laboratorio di Comunicazione e Domotica, Division of Physical Medicine and Rehabilitation, Scientific Institute of Veruno, Veruno, Italy
| | - Anna Maria Turcato
- Istituti Clinici Scientifici Maugeri Spa SB, IRCCS, Division of Physical Medicine and Rehabilitation, Scientific Institute of Veruno , Veruno , Italy
| | - Marco Caligari
- Istituti Clinici Scientifici Maugeri Spa SB, IRCCS, Laboratorio di Comunicazione e Domotica, Division of Physical Medicine and Rehabilitation, Scientific Institute of Veruno , Veruno , Italy
| | - Fabrizio Pisano
- Istituti Clinici Scientifici Maugeri Spa SB, IRCCS, Division of Neurological Rehabilitation, Scientific Institute of Veruno , Veruno , Italy
| | - Marco Schieppati
- Istituti Clinici Scientifici Maugeri Spa SB, IRCCS, Centro Studi Attività Motorie, Pavia, Italy; Department of Public Health, Experimental and Forensic Medicine, University of Pavia, Pavia, Italy
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Zhao S, Cheng R, Zheng J, Li Q, Wang J, Fan W, Zhang L, Zhang Y, Li H, Liu S. A randomized, double-blind, controlled trial of add-on therapy in moderate-to-severe Parkinson's disease. Parkinsonism Relat Disord 2015; 21:1214-8. [DOI: 10.1016/j.parkreldis.2015.08.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Revised: 07/07/2015] [Accepted: 08/19/2015] [Indexed: 10/23/2022]
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Luca CC, Singer C. Can 4-aminopyridine modulate dysfunctional gait networks in Parkinson's disease? Parkinsonism Relat Disord 2013; 19:777-82. [DOI: 10.1016/j.parkreldis.2013.04.024] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2013] [Revised: 04/23/2013] [Accepted: 04/25/2013] [Indexed: 11/28/2022]
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Revuelta GJ, Uthayathas S, Wahlquist AE, Factor SA, Papa SM. Non-human primate FOG develops with advanced parkinsonism induced by MPTP Treatment. Exp Neurol 2012; 237:464-9. [PMID: 22967858 PMCID: PMC3582410 DOI: 10.1016/j.expneurol.2012.07.021] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2012] [Revised: 07/19/2012] [Accepted: 07/26/2012] [Indexed: 10/28/2022]
Abstract
Freezing of gait (FOG) is a debilitating feature of Parkinson's disease (PD) and other forms of parkinsonism. The anatomical or pathophysiological correlates are poorly understood largely due to the lack of a well-established animal model. Here we studied whether FOG is reproduced in the non-human primate (NHP) model of PD. 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-treated monkeys (Genus Macaca, n=29) were examined for the development of FOG, and the leg movements were recorded with accelerometry. The relationships between developing FOG and the animals' characteristics, the MPTP treatments, and the modeled outcomes were determined. In parkinsonian monkeys FOG developed frequently (48%) manifesting similar characteristics to those seen in PD patients. In addition, FOG episodes in the monkey were accompanied by leg trembling with the typical duration (2-10s) and frequency (~7 Hz). The development of NHP FOG was significantly associated with the severity of parkinsonism, as shown by high motor disability scores (≥ 20) and levodopa-induced dyskinesia scores (p=0.01 and p=0.04, respectively). Differences in demographics and MPTP treatments (doses, treatment duration, etc.) had no influence on NHP FOG occurrence, with the exception of gender that showed FOG predominance in males (p=0.03). The unique features of FOG in PD can be replicated in severely parkinsonian macaques, and this represents the first description of a FOG animal model.
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Affiliation(s)
- Gonzalo J Revuelta
- Department of Neurology, Division of Movement Disorders, Emory University School of Medicine, Atlanta, GA, USA.
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Sarbaz Y, Gharibzadeh S, Towhidkhah F. Pathophysiology of freezing of gait and some possible treatments for it. Med Hypotheses 2011; 78:258-61. [PMID: 22115695 DOI: 10.1016/j.mehy.2011.10.040] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2011] [Revised: 08/17/2011] [Accepted: 10/27/2011] [Indexed: 10/15/2022]
Abstract
Freezing of gait (FOG) is a disabling symptom of Parkinson's disease (PD). In this study, we used the model of PD gait behavior for comparing normal and PD persons in order to simulate FOG and find its pathophysiology and probable treatments. We observed in the adapted model that the dopaminergic weights were reduced and the amount of dopaminergic bias was increased. These findings show that the aggravation of the disease and severe resistance of neurons to dopamine agonists may be the main cause of the FOG. Based on our model three therapeutic strategies may be proposed: decreasing the cortex signal to basal ganglia, using high dose glutamate antagonist, and using less glutamate antagonist with some amounts of gabapentin.
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Affiliation(s)
- Yashar Sarbaz
- Neuromuscular Systems Laboratory, Biomedical Engineering Faculty, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
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