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Corti M, Casamento-Moran A, Delmas S, Bracksieck S, Bowman J, Meyer B, Norman S, Subramony S, Christou EA. Temporal but not spatial dysmetria relates to disease severity in FA. J Neurophysiol 2020; 123:718-725. [PMID: 31693434 DOI: 10.1152/jn.00165.2019] [Citation(s) in RCA: 2] [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
Friedreich's ataxia (FA) is an inherited disease that causes degeneration of the nervous system. Features of FA include proprioceptive and cerebellar deficits leading to impaired muscle coordination and, consequently, dysmetria in force and time of movement. The aim of this study is to characterize dysmetria and its association to disease severity. Also, we examine the neural mechanisms of dysmetria by quantifying the EMG burst area, duration, and time-to-peak of the agonist muscle. Twenty-seven individuals with FA and 13 healthy controls (HCs) performed the modified Functional Ataxia Rating Scale and goal-directed movements with the ankle. Dysmetria was quantified as position and time error during dorsiflexion. FA individuals exhibited greater time but not position error than HCs. Moreover, time error correlated with disease severity and was related to increased agonist EMG burst. Temporal dysmetria is associated to disease severity, likely due to altered activation of the agonist muscle.NEW & NOTEWORTHY For the first time, we quantified spatial and temporal dysmetria and its relation to disease severity in Friedreich's ataxia (FA). We found that FA individuals exhibit temporal but not spatial dysmetria relative to healthy controls. Temporal dysmetria correlated to disease severity in FA and was predicted from an altered activation of the agonist muscle. Therefore, these results provide novel evidence that FA exhibit temporal but not spatial dysmetria, which is different from previous findings on SCA6.
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Affiliation(s)
- Manuela Corti
- College of Medicine, Department of Pediatrics, University of Florida, Gainesville, Florida.,College of Medicine, Department of Neurology, University of Florida, Gainesville, Florida
| | - Agostina Casamento-Moran
- College of Health and Human Performance, Department of Applied Physiology and Kinesiology, University of Florida, Gainesville, Florida
| | - Stefan Delmas
- College of Health and Human Performance, Department of Applied Physiology and Kinesiology, University of Florida, Gainesville, Florida
| | - Samantha Bracksieck
- College of Health and Human Performance, Department of Applied Physiology and Kinesiology, University of Florida, Gainesville, Florida
| | - Jessica Bowman
- College of Medicine, Department of Pediatrics, University of Florida, Gainesville, Florida
| | - Blake Meyer
- College of Medicine, Department of Pediatrics, University of Florida, Gainesville, Florida
| | - Samantha Norman
- College of Medicine, Department of Pediatrics, University of Florida, Gainesville, Florida
| | - Sub Subramony
- College of Medicine, Department of Neurology, University of Florida, Gainesville, Florida
| | - Evangelos A Christou
- College of Health and Human Performance, Department of Applied Physiology and Kinesiology, University of Florida, Gainesville, Florida
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Connaghan KP, Moore CA. Indirect estimates of jaw muscle tension in children with suspected hypertonia, children with suspected hypotonia, and matched controls. JOURNAL OF SPEECH, LANGUAGE, AND HEARING RESEARCH : JSLHR 2013; 56:123-36. [PMID: 22653916 PMCID: PMC3974544 DOI: 10.1044/1092-4388(2012/11-0161)] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
PURPOSE In this study, the authors compared indirect estimates of jaw-muscle tension in children with suspected muscle-tone abnormalities with age- and gender-matched controls. METHOD Jaw movement and muscle activation were measured in children (ages 3 years, 11 months, to 10 years) with suspected muscle-tone abnormalities (Down syndrome or spastic cerebral palsy; n = 10) and controls (n = 11). Two measures were used to infer jaw tension: a kinematic index of mass-normalized stiffness and electromechanical delay (EMD). The kinematic index used video-based kinematics to obtain the slope of the peak velocity-displacement relationship. The EMD was derived from the interval between the onset of suprahyoid muscle activity and the onset of jaw depression. RESULTS Neither measure differentiated the groups. The kinematic index revealed differences between stressed and unstressed syllables in 3-syllable productions by the participants with cerebral palsy and controls, but not in 2-syllable productions by the participants with Down syndrome and controls. CONCLUSION This preliminary investigation included the novel application of 2 measures to infer the jaw-muscle tension of children with suspected tone abnormalities. Although the results do not support the hypothesis that suspected muscle-tone abnormalities affect jaw movement sufficiently to influence speech production, considerations for interpreting the findings include methodological limitations and possible compensatory muscle coactivation.
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Abstract
This series of articles for rehabilitation in practice aims to cover a knowledge element of the rehabilitation medicine curriculum. Nevertheless they are intended to be of interest to a multidisciplinary audience. The competency addressed in this article is 'The trainee consistently demonstrates a knowledge of management approaches for specific impairments including spasticity, ataxia.'
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Affiliation(s)
- Jon Marsden
- School of Health Professions, Peninsula Allied Health Centre, Derriford Road, University of Plymouth, PL6 8BH, UK.
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Singh A, Epstein E, Myers LM, Farmer JM, Lynch DR. Clinical measures of dysarthria in Friedreich Ataxia. Mov Disord 2009; 25:108-11. [DOI: 10.1002/mds.22776] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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