Evans D L, Priddle T L, Davie A J
Faculty of Veterinary Science, University of Sydney, New South Wales, Australia.
Equine Vet J Suppl. 2002 Sep(34):131-4. doi: 10.1111/j.2042-3306.2002.tb05405.x.
Relationships between racing performance and plasma lactate and uric acid concentrations after racing were investigated in pacing Standardbred racehorses. The study was undertaken in order to better understand factors that limit racing performance. Twenty horses were tested after races of 1760 m and 28 horses after races over 2160 m. Blood samples were taken 30-60 min before and 8 and 30 min after a race. There were no significant differences between the race distances for prerace and 8 min postrace plasma lactates. Significant low correlations were obtained for plasma lactate concentration 8 min postrace and the number of race wins (r = 0.29, P = 0.04), number of race placings (1st, 2nd or 3rd; r = 0.34, P = 0.02) and lifetime earnings (r = 0.29, P = 0.04). Net lactate was correlated with the number of race placings (r = 0.31, P = 0.03). There were no significant correlations between performance indices and plasma uric acid concentrations in races of 1760 m. For races over 2160 m, correlations were found between plasma uric acid concentration at 8 min postrace and the number of race wins (r = 0.37, P = 0.06, 95% confidence limits 0-0.65). As well, there was a significant correlation between uric acid concentration at 8 min postrace and lifetime earnings (r = 0.35, P = 0.07, 95% confidence limits 0.06-0.64). Only 10-15% of the variability in retrospective career performance in pacing Standardbreds can be explained by these metabolic markers of the muscle anaerobic response to racing. Plasma lactate and uric acid responses to maximal exercise are unlikely to be useful for evaluating racing performance in pacing Standardbreds in univariate analysis.
本研究对标准赛马在比赛后的速度表现与血浆乳酸和尿酸浓度之间的关系进行了调查。开展这项研究是为了更好地了解限制比赛表现的因素。20匹马在跑完1760米的比赛后接受了测试，28匹马在跑完2160米的比赛后接受了测试。在比赛前30 - 60分钟以及比赛后8分钟和30分钟采集血样。赛前和赛后8分钟的血浆乳酸水平在不同比赛距离之间没有显著差异。赛后8分钟的血浆乳酸浓度与比赛获胜次数（r = 0.29，P = 0.04）、比赛名次（第1、2或3名；r = 0.34，P = 0.02）以及终身收入（r = 0.29，P = 0.04）之间存在显著的低相关性。净乳酸与比赛名次相关（r = 0.31，P = 0.03）。在1760米的比赛中，表现指标与血浆尿酸浓度之间没有显著相关性。对于超过2160米的比赛，赛后8分钟的血浆尿酸浓度与比赛获胜次数之间存在相关性（r = 0.37，P = 0.06，95%置信区间0 - 0.65）。同样，赛后8分钟的尿酸浓度与终身收入之间存在显著相关性（r = 0.35，P = 0.07，95%置信区间0.06 - 0.64）。这些肌肉对比赛无氧反应的代谢标志物只能解释标准赛马回顾性职业生涯表现中10 - 15%的变异性。在单变量分析中，血浆乳酸和尿酸对最大运动的反应不太可能用于评估标准赛马的比赛表现。
