[Effect of adequate stimulation of the vestibular apparatus on the locomotor activity of the fore- and hindlimb muscles in guinea pigs. Movements relative to the vertical axis].
Influence of the adequate vestibular stimulation on the muscular locomotor activity evoked by stimulation of the mesencephalic locomotor region was investigated in decerebrated guinea pig. Vestibular stimulation was performed by linear sinusoidal shifts along the vertical axis with frequencies of 0.08, 0.2, 0.4, 0.8 Hz, peak accelerations of 0.010, 0.063, 0.252, 1.010 m s-2, respectively. The downward shift was followed by an increase in the activity of fore- and hindlimb extensor muscles observed in the stance phase and by a decrease in the activity of flexor muscles observed in the swing phase of the locomotor cycle. The upward shift was followed by opposite changes in the activity of locomotor muscles. Threshold acceleration that evoked changes in the muscular activity was 0.063 m.s-2, i.e. 0.006 g. Changes in the activity of locomotor muscles lagged input acceleration. Phase lags in the activity of fore- and hindlimb extensor muscles at 0.8 Hz were 63 and 86 degrees, respectively. Changes in the activity of flexor muscles were opposite to those mentioned above and their lags were 264 and 275 degrees, respectively. Vestibular influences on the locomotor activity of muscles are discussed.
Marlinskiĭ
V V
VV
Tsintsabadze
F I
FI
D000818:Animals; D005552:Forelimb; D006168:Guinea Pigs; D006614:Hindlimb; D008124:Locomotion; D009132:Muscles / Q000502:physiology*; D014722:Vestibule, Labyrinth / Q000502:physiology*
Vliianie adekvatnoĭ stimuliatsii vestibuliarnogo apparata na lokomotornuiu aktivnost' myshts perednikh i zadnikh konechnosteĭ morskoĭ svinki. Peremeshcheniia otnositel'no vertikal'nĭ osi.