Neuromuscular variability and spatial accuracy in children and older adults

Casamento‐Moran, Agostina; Fleeman, Rebecca M.; Chen, Yen‐Ting; Kwon, Min-hyuk; Fox, Emily J.; Yacoubi, Basma El; Christou, Evangelos A.

doi:10.1016/j.jelekin.2018.04.011

Cited by 9 publications

(6 citation statements)

References 49 publications

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“…In this study, coordination was developed by training in U-16 and U-17, but no change was found in U-18. These results support those of previous study that the degree of neuromuscular system development is associated with age and the improvements in motor coordination can be influenced by the full maturity of the nervous system and enhanced neuromuscular efficiency in adolescence ( Casamento-Moran et al, 2018 ; Portas et al, 2016 ). In addition, the coordination ability of football players did not decrease by detraining, unlike other fitness factors such as endurance and speed endurance, which decrease even with a short detraining period ( Joo, 2016 , 2018 ).…”

Section: Discussionsupporting

confidence: 92%

Differences in physical fitness after an 8-week preseason training among elite football players aged 17–19 years

Lee¹,

Joo²

2020

J Exerc Rehabil

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There may be an optimal period of time to maximize the improvement of physical fitness during adolescence. The aim of this study was to examine the magnitude of changes in physical fitness after 8 weeks of preseason training according to chronological ages after the age at peak high velocity. Thirty male young football players from an elite football team (U-16, n= 10; U-17, n= 10; U-18, n= 10) participated in the study. The players completed an 8-week general preseason football training and participated in the pre-and posttests to measure physical fitness. The 8-week preseason training improved the power of all young players (P < 0.05). The 20-m sprint performance was improved by training in U-16 and U-18 (P< 0.05), but no changes were found in the U-17 group (P> 0.05). Significant differences were found in the arrowhead left in U-16 and U-18 (P< 0.05) after training; however, no difference was observed in U-17 (P> 0.05). Coordination was enhanced further in U-16 and U-17 (P< 0.05) compared with that in U-18 (P> 0.05). The performance of repeated sprints and Yo-Yo intermittent recovery test level 1 (Yo-Yo IR1) were similar between pre-and posttraining in all age groups (P> 0.05). Collectively, the results emphasized the importance of systematic and scientific training methods to improve the fitness levels of young football players in the preseason training period. Moreover, training to improve coordination in young football players is effective at younger ages.

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Section: Discussionsupporting

confidence: 92%

Differences in physical fitness after an 8-week preseason training among elite football players aged 17–19 years

Lee¹,

Joo²

2020

J Exerc Rehabil

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“…In line with this idea and similar to our observations, a study investigating jaw movement kinematics and EMG activity in FA found longer jaw movement durations and prolonged EMG bursts in FA relative to HCs (Devanne et al 1995). Although we did not specifically address motor planning impairment in FA, the fast goaldirected movements used in this study are primarily controlled by preplanned descending cortical commands (Casamento-Moran et al 2017), and therefore, our results support the idea that motor planning is impaired in FA (Corben et al 2011). Lastly, it is possible that greater EMG activation represents a compensatory strategy for the reduced sensory information available.…”

Section: Dysmetria In Fasupporting

confidence: 90%

“…Descriptive data show that FA individuals had greater position error compared with HCs but the difference was not statistically significant. We have previously shown that healthy children exhibit greater spatial errors than healthy young and older adults (Casamento-Moran et al 2018;Fox et al 2013); thus the cross-sectional nature of our study might prevent us from obtaining significant differences in spatial dysmetria between FA and HCs. Future studies could examine spatial dysmetria longitudinally in FA and HCs to see if the development of spatial control is impaired in FA.…”

Section: Dysmetria In Famentioning

confidence: 88%

Temporal but not spatial dysmetria relates to disease severity in FA

Corti

Casamento‐Moran

Delmas

et al. 2020

Journal of Neurophysiology

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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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“…The visual gain was kept constant with a visual angle of 1°. See Casamento‐Moran et al for a complete description of the task 22 …”

Section: Methodsmentioning

confidence: 99%

“…See Casamento-Moran et al for a complete description of the task. 22 Data Analysis. We measured the displacement of the wrist (flexion) and ankle (dorsiflexion) using a low-friction potentiometer (SP22G-5 K; Mouser Electronics, Mansfield, TX), located directly inferior to the styloid process of the ulna and directly lateral to the medial malleolus, respectively.…”

Section: Dysmetriamentioning

confidence: 99%

Quantitative Separation of Tremor and Ataxia in Essential Tremor

Casamento‐Moran

Yacoubi

Wilkes

et al. 2020

Annals of Neurology

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Objective This study addresses an important problem in neurology, distinguishing tremor and ataxia using quantitative methods. Specifically, we aimed to quantitatively separate dysmetria, a cardinal sign of ataxia, from tremor in essential tremor (ET). Methods In Experiment 1, we compared 19 participants diagnosed with ET undergoing thalamic deep brain stimulation (DBS; ETDBS) to 19 healthy controls (HC). We quantified tremor during postural tasks using accelerometry and dysmetria with fast, reverse‐at‐target goal‐directed movements. To ensure that endpoint accuracy was unaffected by tremor, we quantified dysmetria in selected trials manifesting a smooth trajectory to the endpoint. Finally, we manipulated tremor amplitude by switching DBS ON and OFF to examine its effect on dysmetria. In Experiment 2, we compared 10 ET participants with 10 HC to determine whether we could identify and distinguish dysmetria from tremor in non‐DBS ET. Results Three findings suggest that we can quantify dysmetria independently of tremor in ET. First, ETDBS and ET exhibited greater dysmetria than HC and dysmetria did not correlate with tremor (R2 < 0.01). Second, even for trials with tremor‐free trajectories to the target, ET exhibited greater dysmetria than HC (p < 0.01). Third, activating DBS reduced tremor (p < 0.01) but had no effect on dysmetria (p > 0.2). Interpretation We demonstrate that dysmetria can be quantified independently of tremor using fast, reverse‐at‐target goal‐directed movements. These results have important implications for the understanding of ET and other cerebellar and tremor disorders. Future research should examine the neurophysiological mechanisms underlying each symptom and characterize their independent contribution to disability. ANN NEUROL 2020;88:375–387.

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Neuromuscular variability and spatial accuracy in children and older adults

Cited by 9 publications

References 49 publications

Differences in physical fitness after an 8-week preseason training among elite football players aged 17–19 years

Differences in physical fitness after an 8-week preseason training among elite football players aged 17–19 years

Temporal but not spatial dysmetria relates to disease severity in FA

Quantitative Separation of Tremor and Ataxia in Essential Tremor

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