Equine Veterinary Journal 38: 214-217.
Kinnunen, S., Laukkanen, R., Haldi, J., Hanninen, O. and Atalay, M., 2006.
Reasons for performing study: Endurance training induces changes in autonomic nervous system functions. High intensity training includes the risk of overtraining, in man and horse. Heart rate variability (HRV) is a noninvasive measurement of the autonomic regulation of the heart rate, which is quick and easy to measure with modern telemetric technology.
Hypothesis: Since HRV is affected by changes in the autonomic nervous system, it might be an early stage indicator of poor recovery from a previous bout of exercise or overreaching or overtraining in horses in general.