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Tytuł pozycji:

Comparison of tap-evoked and tone-evoked postural reflexes in humans.

Tytuł:
Comparison of tap-evoked and tone-evoked postural reflexes in humans.
Autorzy:
Bötzel K; Department of Neurology, Ludwig-Maximilians University, Klinikum Grosshadern, 81366 Munich, Germany. />Kolev OI
Brandt T
Źródło:
Gait & posture [Gait Posture] 2006 Apr; Vol. 23 (3), pp. 324-30. Date of Electronic Publication: 2005 Jun 27.
Typ publikacji:
Comparative Study; Journal Article
Język:
English
Imprint Name(s):
Publication: <2007->: Oxford, UK : Elsevier Sciencem
Original Publication: Oxford, UK : Butterworth-Heinemann, c1993-
MeSH Terms:
Muscle, Skeletal/*physiology
Posture/*physiology
Reflex/*physiology
Acoustic Stimulation ; Adult ; Electromyography ; Female ; Humans ; Leg/physiology ; Male ; Physical Stimulation
Entry Date(s):
Date Created: 20050629 Date Completed: 20060810 Latest Revision: 20061115
Update Code:
20240104
DOI:
10.1016/j.gaitpost.2005.04.007
PMID:
15982888
Czasopismo naukowe
To find an easy clinical test of postural reflexes, we compared tone and tap stimuli for eliciting postural reactions in leg muscles in 13 healthy subjects during upright stance. Tones (1000 Hz, 90 dB nHl) were presented monaurally via headphones; taps were applied with a reflex hammer to the forehead. Surface EMG was recorded from the medial gastrocnemius and the sternocleidomastoid muscles, and rectified and averaged. Tapping the forehead of a standing subject evoked leg muscle reflexes that began 50 ms after the stimulus in all subjects. Tone-evoked leg muscle reflexes behaved differently, i.e., they had smaller amplitudes and could be recorded in only 5 of 13 subjects. However, this same acoustic stimulus elicited reflex activity in the neck muscles of all subjects. There were also other differences (amplitudes, dependence on pre-activation) between these two reflexes. Tone-evoked leg muscle responses and tone-evoked neck muscle responses seem to be mediated by different structures, i.e., the latter by an oligosynaptic pathway and the former by polysynaptic neural circuits. We conclude that tap-evoked leg muscle responses are not or not solely mediated by saccular receptors but other receptors (i.e., proprioceptors, semicircular canals) are probably also involved.

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