Skarda R T, Muir W W, Milne D W, Gabel A A
Am J Vet Res. 1976 Dec;37(12):1485-8.
Five healthy, mature, previously trained Standardbred horses were given no exercise (left in a stall) for 4 months, then jogged (slow exercise) for 3 weeks, and placed in a 6-week training period. Cardiac variables were measured at the beginning of training and after 14, 20, 35, and 42 days of training before and at 10, 15, 20, 25, and 30 minutes after a 1.8-km (in 3:12 +/- 2 seconds) standard, submaximal exercise test on a deep 0.53-km track. There was no significant change during the 6-week conditioning period in the following variables at rest or at any of the times observed during recovery from test exercise: heart rate, PQ-interval, QRS-duration, QT-interval, and ratio of electrical systole to diastole. It appeared that measuring heart rate by electrocardiogram at rest and during recovery from execise is not of significance in evaluating the fitness in the previously trained adult horse.
五匹健康、成熟且先前经过训练的标准赛马被关在马厩中4个月不进行运动，然后进行3周的慢跑（轻度运动），并进入为期6周的训练期。在训练开始时以及训练14天、20天、35天和42天后，在一条0.53公里深的标准赛道上进行1.8公里（用时3分12秒±2秒）的次最大运动测试前和测试后10分钟、15分钟、20分钟、25分钟和30分钟时测量心脏变量。在为期6周的适应期内，以下静息或测试运动恢复过程中任何观察时间的变量均无显著变化：心率、PQ间期、QRS时限、QT间期以及电收缩期与舒张期的比值。看来，通过心电图测量静息和运动恢复过程中的心率，对于评估先前训练过的成年马匹的健康状况并无意义。
