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Thyroid hormone responses to endurance exercise.

E A Graves1, H C Schott, J V Marteniuk

  • 1Department of Large Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing, Michigan 48824-1314, USA.

Equine Veterinary Journal. Supplement
|April 4, 2007
PubMed
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Prolonged endurance exercise in horses causes temporary reductions in circulating thyroid hormones, including thyroxine (T4) and triiodothyronine (T3). These changes are most significant after longer distances and during recovery periods.

Area of Science:

  • Equine physiology
  • Endocrinology
  • Exercise science

Background:

  • Limited data exists on thyroid hormone changes in horses during prolonged endurance exercise.
  • Understanding these fluctuations is crucial for assessing thyroid function in athletic horses.

Purpose of the Study:

  • To investigate the impact of varying distances of endurance exercise on serum iodothyronine concentrations in horses.
  • To analyze the time course of thyroid hormone changes during and after prolonged exercise.

Main Methods:

  • Serum iodothyronine concentrations (T4, T3, FT4, FT3, rT3) were measured in horses before and after endurance rides of 40, 56, 80, and 160 km.
  • Measurements were also taken daily during a 5-day, 424 km ride and for 72 hours post-exercise following a simulated 60 km treadmill test.

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Main Results:

  • Shorter rides (40-56 km) had minimal impact, except for a slight decrease in free thyroxine (FT4).
  • Longer rides (80-160 km) and multi-day exercise led to significant decreases in total thyroxine (T4), total triiodothyronine (T3), FT4, and free triiodothyronine (FT3).
  • Post-exercise recovery showed the greatest decrease at 12 hours, with concentrations returning to baseline by 24 hours.

Conclusions:

  • Endurance exercise induces transient decreases in serum iodothyronine concentrations in horses.
  • These findings are essential for interpreting thyroid gland function tests in endurance horses, considering exercise-induced hormonal shifts.