Effect of thyroxine on nervous system in controlling chicken heart rate

Electrical activity of the oviduct of the laying hen during egg transport

“…Radiotelemetric determinations of heart rate and EEG have previously been performed on free-moving chickens (Shimada & Oshima, 1973;Oshima, Shimada & Tonoue, 1974) and I am hoping to apply this technique for recording uterine activity with special reference to the time of oviposition. I thank Dr .…”

Effects of age, exercise and varying thyroxine levels on cardiovascular parameters and cholesterol turnover pools of the rat

“…FBWT and blood flow, did not follow a similiar linear response. This finding supports the current view that thyroxine directly affects the heart (Anton and Gravenstein, 1970;Van'der Schoot and Moran, 1965;and Wilson et al, 1566), the padrenergic receptors (Pietras et , 1972) or the SA node and impair ment of vagal inhibition (Heimback and Grout, 1972;Shimada and Oshima, 1973) to increase the heart rate.…”

“…To complete the current picture of possibilités researchers (Heimbach and Crout, 1972;Shimada and Oshima, 1973) There is evidence, however, for an interrelationship between catechols and thyroid state in cardiac contractility. Freedberg and Hamolsky (1974) reported a depressed left ventricular maximal dp/dt response to isoproterenol in the hypothyroid dog, compared with euthyroid or with T^-treated dogs.…”

Effect of thyrotropin releasing hormone on heart rate and visual evoked potentials in rats.

“…It is well known that thyroid hormones augment heart rate, but the mechanism of this action still remains unclear (Freedberg and Hamolsky, 1974;Bray and Jacobs, 1974). It was demonstrated by Shimada and Oshima (1973) of this laboratory that thyroxine (T4) increased the heart rate in the chicken following a short latent period. This was observed only when the treatment was applied to these birds while AA, TSH TRH the major waves were not altered up to 20 min following injection (Fig.…”