Ohmura Hajime, Hiraga Atsushi, Aida Hiroko, Kuwahara Masayoshi, Tsubone Hirokazu, Jones James H
Equine Science Division, Hidaka Training and Research Center, Japan Racing Association, 535-13 Aza-Nishicha, Urakawagun, Hokkaido 057-0171, Japan.
Am J Vet Res. 2006 Mar;67(3):455-62. doi: 10.2460/ajvr.67.3.455.
To determine whether evaluation of heart rate (HR) and HR variability (HRV) during prolonged road transportation in horses provides a sensitive index of autonomic stimulation.
Five 2-year-old Thoroughbreds.
ECGs were recorded as horses were transported for 21 hours in a 9-horse van. Heart rate, high-frequency (HF) power, low-frequency (LF) power, and LF-to-HF ratio from Fourier spectral analyses of ECGs were calculated and compared with values recorded during a 24-hour period of stall rest preceding transportation.
HR, HF power, and LF power had diurnal rhythms during stall rest but not during road transportation. Heart rate was higher and HF power and LF power lower during road transportation than stall rest, and HR, HF power, LF power, and LF-to-HF ratio all decreased with time during road transportation. Heart rate during stall rest was weakly and inversely associated with LF power, but during road transportation was strongly associated with LF power, HF power, and LF-to-HF ratio. Neither LF power nor HF power was correlated with LF-to-HF ratio during stall rest, but LF power was strongly and HF power weakly correlated with LF-to-HF ratio during road transportation. High-frequency power and LF power were significantly correlated with each other during stall rest and road transportation. Heart rate was significantly influenced by LF power and LF-to-HF ratio during stall rest (R(2) = 0.40) and by HF power and LF-to-HF ratio during road transportation (R(2) = 0.86).
HR is influenced by different sympathovagal mechanisms during stall rest, compared with during road transportation; HRV may be a sensitive indicator of stress in transported horses.
确定在马匹长时间公路运输过程中评估心率（HR）和心率变异性（HRV）是否能提供自主神经刺激的敏感指标。
5匹2岁的纯种马。
在9匹马的运输车内对马匹进行21小时运输期间记录心电图。计算心电图傅里叶频谱分析得出的心率、高频（HF）功率、低频（LF）功率和LF与HF比值，并与运输前24小时厩内休息期间记录的值进行比较。
在厩内休息期间，HR、HF功率和LF功率有昼夜节律，但在公路运输期间没有。公路运输期间的心率高于厩内休息期间，HF功率和LF功率低于厩内休息期间，并且在公路运输期间HR、HF功率、LF功率和LF与HF比值均随时间下降。厩内休息期间的心率与LF功率呈弱负相关，但在公路运输期间与LF功率、HF功率和LF与HF比值呈强相关。在厩内休息期间，LF功率和HF功率与LF与HF比值均无相关性，但在公路运输期间，LF功率与LF与HF比值呈强相关，HF功率与LF与HF比值呈弱相关。在厩内休息和公路运输期间，高频功率和低频功率彼此显著相关。在厩内休息期间，心率受LF功率和LF与HF比值的显著影响（R² = 0.40），在公路运输期间受HF功率和LF与HF比值的显著影响（R² = 0.86）。
与公路运输期间相比，厩内休息期间HR受不同的交感迷走神经机制影响；HRV可能是运输马匹应激的敏感指标。
