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Online Journal of Veterinary Research

(Including Medical and Laboratory Research)

Established 1994
ISSN 1328-925X


Volume 27 (7): 432-436, 2023

Cardiovascular and hematological responses to Submaximal exercise in athletic horses.


Mehdi Sakha1 DVM PhD, Hasan Rahmani2 DVM.


Faculties of Veterinary Science, Islamic Azad University1, Tehran and Shahid Bahonar University2, Kerman, Iran.




Sakha M, Rahmani H., Cardiovascular and hematological responses to submaximal exercise in athletic horses, Onl J Vet Res., 27 (7): 432-436, 2023. Cardiovascular response and hematology in 19 athletic before and after a 1600 meter race are reported. Resting heart rates of 36.1 + 5.5bpm increased ~72% to 132 + 17 bpm immediately after race (P < 0.001) and fell ~42bpm 15-50%, 1-5min after but only reached resting rate of 36bpm by 10-15 minutes. We found no differences in maximum rates between individual horses (P > 0.05). Heart rate declined ~15% by 1min ranging 5.8 to 30% but ~42% remained below mean and by 2nd min 29% and 51% by 5th minute. Eleven horses reached 60bpm after 20 min, 21.1% had normal 36.8bpm by 30-40min but only 63.2% animals had reached normal resting heart rates by 60min. Mean heart rates after 60min was 42.4 + 11.7 bpm. Maximum heart rates suggest submaximal exercise in these horses. Mean red cell had increased 25% and volume ~8% (P < 0.05) immediately after race. Our results suggest that maximum heart rates, reduction (min), red and packed cell volumes after exercise may be related with performance in athletic horses.


Key words: Submaximal, exercise, horse, heart, hematology, cardiac response.