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Thyroid hormones response to dressage simulation test in young Lusitano horses
Simões Coelho, Clarisse; Farinelli...
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Introduction: Dressage is an Olympic equestrian discipline that requires special characteristics such as a precise interaction between the rider and the horse. The comprehension of such a level of effort is important and tracking the exercise-related responses of the horses represents a way to monitor performance and the wellbeing of such athletic animals. The aim of this study was to evaluate thyroid hormones response to a dressage simulation test by measuring serum concentration of total (TT4) and free thyroxine (FT4) and total (TT3) and free triiodothyronine (FT3) in young Lusitano horses.
Material and Methods: Eight 4-year-old Lusitano horses, 474.8±46.9 kg, executed a dressage simulation exercise (DST) for ~5 minutes, after a warming period. The DST was performed in a 30x15m indoor arena demarcated by letters in accordance with FEI regulations. During the exercise all animals used a Polar M430/H10 heart monitor. Horses were examined before (T0) and after (T1) DST, and at 240 min (T2) during the recovery period. Blood samples were taken to determine TT3, FT3, TT4 and FT4. All variables were analyzed by ANOVA and Tukey test with P<0.05 to denote significancy.
Results: The exercise led to significant increases for TT3 (38.7 to 61.6 ng/dL, P=0.0243), that remained high (59.1 ng/dL) even after 4 hours of recovery. Further, both TT4 and FT4 significantly increased during the recovery period (TT4- 31.2 to 34.2 nmol/L, P=0.0019: FT4- 15.1 to 20.6 pmol/L, P=0.0022). During DST, animals reached Vmed of 2.31±0.70 m/s and HRmed of 108.6±24.5 beats/min in a 220 m distance.
Discussion/Conclusion: Results demonstrated that circulating concentration of TT3, TT4 and FT4 in horses increased in response to dressage exercise. Exercise-induced changes have already been described previously, however results are inconsistent. These data are important to consider when evaluating young Lusitano horses used for dressage.
References
- Coelho CS, Folador JC, Drumond B, Souza VRC. Thyroid hormone response to marcha gait in Mangalarga Marchador horses. Rev Bras Ci Vet 2015; 22(1):19–22.
- Graves EA, Schott HC, Marteniuk JV, Refsal KR, Nachreiner RF. Thyroid hormone responses to endurance exercise. Eq Vet J 2010; 36(Suppl.):32–36.
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About
Affiliation of the authors at the time of publication
1 Lusofona University, Faculty of Veterinary Medicine, Lisboa, Portugal ; 2 Universidade Federal De Santa Maria, Large Animal Clinic, , Brasil ; 3 Universidade Federal Rural de Pernambuco, Departamento de Zootecnia, Recife, Brasil.
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