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  • Electronic Resource  (2)
  • Key words Human gait  (1)
  • Myotonic dystrophy  (1)
  • 1
    ISSN: 1432-1106
    Keywords: Key words Human gait ; Transcranial magnetic stimulation ; Motor cortex ; Leg flexor/extensor muscle ; Corticospinal input ; Visual control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  The aim of this study was to investigate visuomotor control during human gait. It was assumed that visual input should modulate transcranially evoked motor potentials (EMPs) during walking. The effect of transcranial magnetic stimulation (TMS) in a visually guided precision stepping task was compared with that during normal gait. EMPs were studied in tibialis anterior (TA), gastrocnemius (GM), and abductor digiti minimi (AD) muscles during treadmill walking. In both stepping tasks, a facilitation of EMPs was observed prior to activation of the respective leg muscle. EMP facilitation proved to be modulated throughout the stride cycle when normalising EMP with respect to the underlying electromyogram (EMG). Facilitation was strongest in TA prior to the swing phase. Significant differences of EMP facilitation between the visual and control tasks were present. In the visual task, maximal facilitation of TA EMPs prior to and during the swing phase was decreased compared to the control task. Conversely, there was increased facilitation of GM EMPs during swing phase of the visual task, prior to the heel strike and prior to the plantarflexion, which was the moment when the target was hit. Thus, the effect of visual input upon EMPs in TA and GM was differential and reciprocal according to the respective functional state. The results support the hypothesis of a conditioning effect of visual or, alternatively volitional, drive on EMPs during stepping.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Neurological sciences 13 (1992), S. 53-58 
    ISSN: 1590-3478
    Keywords: Myotonic dystrophy ; cognitive function ; psychiatric diagnosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Sommario Abbiamo valutato, in 40 pazienti affetti da forma severa di distrofia miotonica (MD), i disturbi cognitivi e i sintomi psichiatrici mediante test neuropsicologici (WAIS-R, MMSE) e mediante intervista semistrutturata e scala di autovalutazione (SADS, SRT). Come controllo abbiamo utilizzato 20 controlli sani. I pazienti con MD avevano punteggi significativamente più bassi di QI totale (p〈0.001), Verbale (p〈0.001) e non-Verbale (p〈0.001) del WAIS-R e al MMSE (p〈0.05) rispetto ai controlli. Il trentacinque per cento dei pazienti aveva una diagnosi psichica, di cui 17.5% avevano disturbi depressivi. I nostri dati confermano che i disturbi cognitivi e psichiatrici sono una manifestazione clinica importante nella distrofia miotonica.
    Notes: Abstract We evaluated 40 patients suffering from a severe form a myotonic dystrophy (MD) with neuropsychological (WAIS-R, MMSE) and psychiatric tests (SADS, SRT) for the assessment of cognitive and psychiatric symptoms. We tested 20 normal volunteers as control group. Patients with MD scored significantly, lower on WAIS Full Scale (p〈0.001), Verbal Scale (p〈0.001), and Performance Scale (p〈0.001) and on the MMSE (p〈0.05) than the controls. 35% of patients met the Research Diagnostic Criteria for a psychiatric diagnosis; 17.5% of them had a depressive disorder. The scores on SADS subscales and on the SRT scale of depression were also significantly higher in patients than in controls. Our data confirm that mental impairment and psychiatric disorders are important clinical manifestations of CNS dysfunction in the severe form on MD.
    Type of Medium: Electronic Resource
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