RESUMEN
Cardiac rhythm responses to otolith stimulation were investigated in two Bion 11 monkeys during flight (Z axis) and before and after flight (X axis). Cardiac rhythm responses were found to change in microgravity due to variations in the excitation of vestibular structures and vagal control of cardiac function.
Asunto(s)
Frecuencia Cardíaca/fisiología , Membrana Otolítica/fisiología , Vuelo Espacial , Percepción Visual/fisiología , Ingravidez , Animales , Oscuridad , Presentación de Datos , Movimientos de la Cabeza , Luz , Macaca mulatta , MasculinoRESUMEN
Head pitch movement and vestibular neuronal activity of two Bion 11 monkeys exposed to otolith stimulation were investigated. During flight both parameters went through facilitation and inhibition followed by enhancement. The resultant data suggest involvement of the visual input in the above changes.
Asunto(s)
Movimientos de la Cabeza , Membrana Otolítica/fisiología , Vuelo Espacial , Núcleos Vestibulares/fisiología , Ingravidez , Animales , Mapeo Encefálico , Electrodos Implantados , Electrofisiología , Macaca mulatta , Masculino , Técnicas Estereotáxicas , Vestíbulo del Laberinto/fisiologíaRESUMEN
The aim was to determine a technique and parameters to test the otolith-autonomous reflex responses in conscious monkeys. The study involved 8 Macacas mulatta weighing 3 to 5 kg with subcutaneously pre-implanted electrodes to record ECG, rheopneumogram, and myoelectric activity of the stomach. The animals were seated in primate couches in which their bodies were softly restrained whereas their heads were restrained rigidly with plastic rings mounted on the cranium. Subsiding motion of a flat-parallel swing with the proper period of 3 s and starting amplitudes 20 cm (0.08 g) and 40 cm (0.16 g) exerted vestibular stimulation along the interaural axis. The monkeys responded to stimulation by altering the external breathing, myoelectric activity of the stomach, and cardiac rhythm. The highest reproducibility and individual steadiness featured cardiac reactions manifested by 2 waves of HR acceleration sequel to reflex-driven changes in the activity of the sympathetic and parasympathetic components of the autonomous nervous system. Data of the study attested the feasibility of testing the otolith-autonomous reflex responses in conscious monkeys with moderate stimulation in controlled experiments.
