Morgan K, Funkquist P, Nyman G
Department of Equine Studies, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala.
Equine Vet J Suppl. 2002 Sep(34):564-7. doi: 10.1111/j.2042-3306.2002.tb05484.x.
The aim of this study was to study the physiological, especially thermoregulatory, responses during intense exercise in the clipped horse compared to the horse with winter coat. Six Standardbred trotters were studied before and after clipping. They performed an inclined incremental high intensity treadmill exercise test and were monitored during recovery. The clipped horse differed significantly (ANOVA) during exercise as compare to coated: less increase in central venous blood temperature, higher skin surface temperature, greater difference skin to ambient temperature and higher rate of nonevaporative heat loss. The clipped horse had significantly lower total cutaneous evaporative heat loss from walk to end of peak exercise and a shorter time for recovery for the respiratory rate using a paired t test. The clipped horse showed a tendency (P = 0.059) to decreased oxygen uptake during the stepwise increase in workload. We concluded that the clipped horse experienced less strain on the thermoregulatory system due to an enhanced heat loss. Some clipped horses in the study showed a more efficient power output; future studies with emphasis on respiration and oxygen demand are needed to explain this.
本研究的目的是比较剪毛马与穿着冬季被毛的马在剧烈运动期间的生理反应，尤其是体温调节反应。对6匹标准赛马在剪毛前后进行了研究。它们进行了倾斜递增高强度跑步机运动测试，并在恢复过程中进行监测。与有被毛的马相比，剪毛马在运动期间有显著差异（方差分析）：中心静脉血温度升高较少、皮肤表面温度较高、皮肤与环境温度的差异较大以及非蒸发散热率较高。使用配对t检验，剪毛马从步行到运动峰值结束时的总皮肤蒸发散热量显著较低，呼吸频率恢复时间较短。在工作量逐步增加期间，剪毛马的氧气摄取量有下降趋势（P = 0.059）。我们得出结论，由于散热增强，剪毛马的体温调节系统所承受的压力较小。本研究中的一些剪毛马表现出更高效的功率输出；未来需要着重研究呼吸和氧气需求来解释这一现象。
