Cottin F, Médigue C, Lopes P, Petit E, Papelier Y, Billat V L
Laboratory of Exercise Physiology (LEPH), University of Evry, E.A. 3872, Genopole, Boulevard F. Mitterand, 91025 Evry cedex, France.
Int J Sports Med. 2005 Dec;26(10):859-67. doi: 10.1055/s-2005-837462.
RR intervals of ten elite trotting horses were recorded during an interval training session performed on track. This study examined two hypotheses. Firstly, like in humans, the hyperpnea combined with a decrease in cardiac autonomic control on heart rate during heavy exercise could result in a prevalence of high frequency heart rate variability. Secondly, this prevalence could increase with the heavy exercise repetition. Two exercise intensities were compared: moderate (ME) and heavy (HE). Furthermore, heavy exercise repetitions were compared between the beginning and the end of the interval training session. When comparing ME and HE periods: heart rate was significantly lower (155 +/- 12 vs. 210 +/- 9 ms, p < 0.001), LF spectral energy (0.04 - 0.2 Hz) was significantly higher (ME: 6.94 +/- 4.80 and HE: 0.24 +/- 0.14 ms(2) . Hz (-1), p < 0.001) whereas HF (0.2 - 2 Hz) was significantly lower (ME: 7.09 +/- 2.24 and HE: 10.60 +/- 3.64 ms(2) . Hz (-1), p < 0.05). In relative terms, ME showed similar results in both LFn (LF/LF+HF) and HFn (HF/LF+HF) whereas HE showed a large prevalence of HFn energy compared to LFn (p < 0.001). The difference in LF/HF ratio between the two exercise conditions was significant (1.14 +/- 0.92 vs. 0.09 +/- 0.12, p < 0.001). Exercise repetition induced a significant increase in heart rate between the beginning and the end of the interval training session (207 +/- 10 beats . min (-1) vs. 212 +/- 9 beats . min (-1), p < 0.001) whereas LF energy decreases (1.54 +/- 1.65 vs. 0.32 +/- 0.24 ms(2) . Hz (-1), p < 0.01) and HF energy remained constant (10.79 +/- 4.10 vs. 10.40 +/- 3.35 ms(2) . Hz (-1), NS). This study confirmed the results observed in humans during heavy exercise conditions with a large prevalence of HF in contrast to LF, this prevalence increasing with exercise repetitions. The observed decrease in LF/HF ratio could provide an index of hyperpnea in horses during interval training.
在赛道上进行的间歇训练期间，记录了10匹精英快步马的RR间期。本研究检验了两个假设。首先，与人类一样，剧烈运动期间的呼吸急促与心脏自主神经对心率控制的降低相结合，可能导致高频心率变异性占优势。其次，这种优势可能随着剧烈运动的重复而增加。比较了两种运动强度：中等强度（ME）和高强度（HE）。此外，还比较了间歇训练开始和结束时剧烈运动的重复情况。比较ME和HE阶段时：心率显著更低（155±12 vs. 210±9毫秒，p<0.001），低频谱能量（0.04 - 0.2赫兹）显著更高（ME：6.94±4.80，HE：0.24±0.14毫秒²·赫兹⁻¹，p<0.001），而高频（0.2 - 2赫兹）显著更低（ME：7.09±2.24，HE：10.60±3.64毫秒²·赫兹⁻¹，p<0.05）。相对而言，ME在低频归一化值（LF/LF+HF）和高频归一化值（HF/LF+HF）方面显示出相似的结果，而HE与低频归一化值相比，高频归一化值能量占优势更大（p<0.001）。两种运动条件下的LF/HF比值差异显著（1.14±0.92 vs. 0.09±0.12，p<0.001）。运动重复导致间歇训练开始和结束之间心率显著增加（207±10次·分钟⁻¹ vs. 212±9次·分钟⁻¹，p<0.001），而低频能量降低（1.54±1.65 vs. 0.32±0.24毫秒²·赫兹⁻¹，p<0.01），高频能量保持不变（10.79±4.10 vs. 10.40±3.35毫秒²·赫兹⁻¹，无显著性差异）。本研究证实了在人类剧烈运动条件下观察到的结果，与低频相比高频占优势很大，这种优势随着运动重复而增加。观察到的LF/HF比值降低可能为马匹在间歇训练期间的呼吸急促提供一个指标。
