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The EMG development of the longissimus
and multifidus muscles after plugging the horizontal semicircular canals. |
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AUTHORS: |
Geisler HC; Gramsbergen A |
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SOURCE: |
J Vestib Res 1998
Nov-Dec;8(6):399-409 |
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CITATION IDS: |
PMID: 9842510 UI: 99058657 |
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ABSTRACT: |
The effects of plugging both
horizontal semicircular canals at the 5th postnatal day (P5) on the development of the EMG
of two back muscles (the M. longissimus lateralis and the M. multifidus) were studied in
rats between P5 and P46. The EMG was related to locomotion, grooming, and rearing of these
rats. Special attention was paid to locomotor behavior. After this vestibular deprivation,
the development of a consistent temporal relation between burst activity in the EMG of
both Mm. longissimii laterales and the swing phase of one hind paw was retarded by about 3
days. The development of coupling of maximal activity in the M. longissimus lateralis to
the swing phase of one of the hind paws was even more retarded. No differences were
observed between normal and vestibularly deprived rats during the development of activity
in the Mm. multifidi. Our results indicate that information from the horizontal
semicircular canals is essential for dynamic postural development and probably, therefore,
for motor development in general. Furthermore, lack of such information has effects on the
fine tuning of back muscle activity during locomotion at least until P40. |
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MAIN MESH HEADINGS: |
Motor Activity/*physiology
Muscle, Skeletal/*physiology
Posture/*physiology
Semicircular Canals/*physiology |
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ADDITIONAL MESH HEADINGS: |
Animal
Behavior, Animal/physiology
Electrodes, Implanted
Electromyography
Female
Movement/physiology
Pregnancy
Rats
Semicircular Canals/surgery
Sensory Deprivation/physiology
Vestibule/physiology |
