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Bend or stretch? How stressful is hyperflexion of horses' necks?
Date:7/24/2012

Arguments over how best to train horses have raged for centuries. Two years ago, the International Equestrian Federation (FEI) was even moved to ban the practice of hyperflexion as a result of a petition signed by over 40,000 people claiming that it caused the animals unnecessary discomfort. The FEI did make a distinction between hyperflexion by the use of extreme force and what it termed "low, deep and round" (LDR), which essentially achieves the same position without force. How forceful hyperflexion should be distinguished from permissible LDR training was not clearly stated instead, a working group has been established to come up with an acceptable definition.

The debate between the proponents and the opponents of hyperflexion has given rise to considerable emotions on both sides but has unfortunately been characterized by a lack of scientific evidence. Mareike Becker-Birck in the group of Christine Aurich at the University of Veterinary Medicine, Vienna (Vetmeduni Vienna) has attempted to fill the void by comparing the levels of stress shown by horses trained on the lunge with their necks either extended forwards or fixed in hyperflexion. Stress was assessed by monitoring the levels of stress hormones in the animals' saliva and by following the heart rate and the fluctuations in heart rate exhibited before, during and after training. In addition, the surface body temperature was measured before and after the experiment. None of the horses suffered any obvious discomfort during the training, which was undertaken without the use of a whip.

The horses showed an increase in stress hormones in their saliva, an increase in heart rate and a decrease in heart rate variability when they were trained. The changes presumably stem from a combination of physical activity and the normal stress responses. The level of stress incurred by the animals was not particularly high the change in hormones in the saliva was actually less than when horse
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Contact: Prof. Christine Aurich
christine.aurich@vetmeduni.ac.at
43-664-602-576-400
University of Veterinary Medicine -- Vienna
Source:Eurekalert

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