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The relationship between basal metabolic rate (BMR) and concentrations of plasma thyroid hormones in fasting cockerels.
Folia Biol (Krakow). 1989; 37(1-2):83-90.FB

Abstract

A correlation between the Basal Metabolic Rate (BMR) and the level of rT3, and occasionally between BMR and T3 or T4 was found in 12 month fasting cockerels. The birds were fasted for 48 hrs and BMR was measured eight times (before fasting, at 6, 12, 24, 30, 36, and 48 hrs of fasting, and 4 hours after fasting). Blood samples for plasma collection were taken immediately after measuring the BMR. During starvation a decrease in BMR was observed. After refeeding BMR returned to the starting level. The decrease in BMR was accompanied by an increase in rT3 and T4 plasma levels. Between BMR and levels of T4 and rT3 negative coefficients of correlation were observed (r = -0.20 and r = -0.42, respectively). Contrary to this, the T3 level declined and was correlated with BMR (r = 0.62). After refeeding, the T3 level rapidly increased against the control value. Moreover, a high coefficient of correlation (r = -0.39) was found between the level of T3 and rT3. The data show that the reduction in plasma T3 level and increase in the rT3 one during starvation may be due to inhibition of deiodination of T4 to T3, since rT3 is a competitive inhibitor of this reaction. The presented results support the suggestion that in birds T3 is the metabolically active thyroid hormone, and rT3 antagonizes this effect.

Authors

No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

2776919

Citation

Sechman, A, et al. "The Relationship Between Basal Metabolic Rate (BMR) and Concentrations of Plasma Thyroid Hormones in Fasting Cockerels." Folia Biologica, vol. 37, no. 1-2, 1989, pp. 83-90.
Sechman A, Niezgoda J, Sobociński R. The relationship between basal metabolic rate (BMR) and concentrations of plasma thyroid hormones in fasting cockerels. Folia Biol (Krakow). 1989;37(1-2):83-90.
Sechman, A., Niezgoda, J., & Sobociński, R. (1989). The relationship between basal metabolic rate (BMR) and concentrations of plasma thyroid hormones in fasting cockerels. Folia Biologica, 37(1-2), 83-90.
Sechman A, Niezgoda J, Sobociński R. The Relationship Between Basal Metabolic Rate (BMR) and Concentrations of Plasma Thyroid Hormones in Fasting Cockerels. Folia Biol (Krakow). 1989;37(1-2):83-90. PubMed PMID: 2776919.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The relationship between basal metabolic rate (BMR) and concentrations of plasma thyroid hormones in fasting cockerels. AU - Sechman,A, AU - Niezgoda,J, AU - Sobociński,R, PY - 1989/1/1/pubmed PY - 1989/1/1/medline PY - 1989/1/1/entrez SP - 83 EP - 90 JF - Folia biologica JO - Folia Biol. (Krakow) VL - 37 IS - 1-2 N2 - A correlation between the Basal Metabolic Rate (BMR) and the level of rT3, and occasionally between BMR and T3 or T4 was found in 12 month fasting cockerels. The birds were fasted for 48 hrs and BMR was measured eight times (before fasting, at 6, 12, 24, 30, 36, and 48 hrs of fasting, and 4 hours after fasting). Blood samples for plasma collection were taken immediately after measuring the BMR. During starvation a decrease in BMR was observed. After refeeding BMR returned to the starting level. The decrease in BMR was accompanied by an increase in rT3 and T4 plasma levels. Between BMR and levels of T4 and rT3 negative coefficients of correlation were observed (r = -0.20 and r = -0.42, respectively). Contrary to this, the T3 level declined and was correlated with BMR (r = 0.62). After refeeding, the T3 level rapidly increased against the control value. Moreover, a high coefficient of correlation (r = -0.39) was found between the level of T3 and rT3. The data show that the reduction in plasma T3 level and increase in the rT3 one during starvation may be due to inhibition of deiodination of T4 to T3, since rT3 is a competitive inhibitor of this reaction. The presented results support the suggestion that in birds T3 is the metabolically active thyroid hormone, and rT3 antagonizes this effect. SN - 0015-5497 UR - https://www.unboundmedicine.com/medline/citation/2776919/The_relationship_between_basal_metabolic_rate__BMR__and_concentrations_of_plasma_thyroid_hormones_in_fasting_cockerels_ DB - PRIME DP - Unbound Medicine ER -