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Information Journal Paper

Title

STRENUOUS, FATIGUING EXERCISE: RELATIONSHIP OF CORTISOL TO CIRCULATING THYROID HORMONES

Pages

  18-24

Abstract

 The purposes of this study were to dete3rmine how strenuous, fatiguing running EXERCISE affects: 1) selective thyroid hormones, and 2) the relationship of glucocorticoid responses to such EXERCISE with thyroid hormones.Materials and Methods: Well-trained subjects (n=12) performed a treadmill run at individual ventilatory threshold (74±8% of maximal aerobic capacity) until volitional FATIGUE (68.3±12.3 min). Blood samples were taken before EXERCISE as a resting baseline (B0), at FATIGUE (FG), 90-minutes into recovery (90mR), and 24-hours into recovery (24hR). Blood was analyzed for free T3 (fT3), free T4 (fT4), thyroid-stimulating hormone (TSH), and cortisol.Results: Significant increases in fT3 and TSH concentrations between B0 and FG (fT3= 1.70 pg/mL vs. 2.08 pg/mL; TSH=1.69 µIU/mL vs. 2.43 µIU/mL, p<0.01) were observed, but by 24hR, significant decreases from B0 were present (fT3 and TSH=1.48 pg/mL and 1.20 µIU/ml, respec-tively; p<0.05).FG fT4 demonstrated a non-significant increase from B0 (FG fT4=1.84 ng/dL) but by 24hR fT4 was significantly lower than FG (24hR fT4=1.67 ng/dL, p<0.01). FG cortisol levels increased significantly from B0 (476.1 to 843.9 nmol/L, p <0.01) and remained elevated at 90mR (892.2 nmol/L) but returned to baseline by 24hR. Spearman correlation analysis yielded a signifi-cant negative correlation between FG cortisol and 24hR TSH (r= -0.65, p<0.05). A strong trend was also noted between FG cortisol and 24hR ft3 (r = -0.55, p<0.07).Conclusion: These findings suggest that exhaustive EXERCISE decreases the level of selective thy-roid hormones by 24 hours into recovery, and that cortisol levels after fatiguing EXERCISE are negatively related to circulating TSH at this point into recovery.[Int J Endocrinol Metab 2005.1:18-24]

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    APA: Copy

    MOORE, A.W., TIMMERMAN, S., BROWNLEE, KK., RUBIN, DA., & HACKNEY, AC.. (2005). STRENUOUS, FATIGUING EXERCISE: RELATIONSHIP OF CORTISOL TO CIRCULATING THYROID HORMONES. INTERNATIONAL JOURNAL OF ENDOCRINOLOGY AND METABOLISM (IJEM), 3(1), 18-24. SID. https://sid.ir/paper/297261/en

    Vancouver: Copy

    MOORE A.W., TIMMERMAN S., BROWNLEE KK., RUBIN DA., HACKNEY AC.. STRENUOUS, FATIGUING EXERCISE: RELATIONSHIP OF CORTISOL TO CIRCULATING THYROID HORMONES. INTERNATIONAL JOURNAL OF ENDOCRINOLOGY AND METABOLISM (IJEM)[Internet]. 2005;3(1):18-24. Available from: https://sid.ir/paper/297261/en

    IEEE: Copy

    A.W. MOORE, S. TIMMERMAN, KK. BROWNLEE, DA. RUBIN, and AC. HACKNEY, “STRENUOUS, FATIGUING EXERCISE: RELATIONSHIP OF CORTISOL TO CIRCULATING THYROID HORMONES,” INTERNATIONAL JOURNAL OF ENDOCRINOLOGY AND METABOLISM (IJEM), vol. 3, no. 1, pp. 18–24, 2005, [Online]. Available: https://sid.ir/paper/297261/en

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