Haennel R, Teo K K, Quinney A, Kappagoda T
Department of Medicine, University of Alberta, Edmonton, Canada.
Med Sci Sports Exerc. 1989 Oct;21(5):605-12.
The effect of hydraulic circuit training (HCT) on cardiovascular (CV) function was assessed in 32 healthy middle-aged males (X age = 42.2 +/- 2.1 yr). Maximal aerobic power (VO2max), with simultaneous measurement of stroke volume (SV) and cardiac output (CO), by impedance cardiography, was assessed pre- and post-training. Subjects were randomly assigned to a nonexercising control group, a cycle training group (cycle), or one of the two HCT groups. Training groups participated in a 9 wk program, 3 d.wk-1. Subjects assigned to HCT exercised on a 9 station circuit, completing 3 circuits.d-1. Each circuit consisted of three 20 s work intervals at each station with a 1:1 work:rest ratio. One HCT group (HCTmax) completed the maximal repetitions possible (RM) during each work interval. The other HCT group (HCTsub) exercised at 70-85% of RM. Following training VO2max (ml.kg-1 min-1) was significantly increased in all training groups (18.0, 12.5, and 11.3% for cycle, HCTsub, and HCTmax groups, respectively; P less than 0.05). The increase in VO2max observed in the cycle group was significantly greater than that recorded by the two HCT groups (P less than 0.05). For all three training groups, the increase in VO2max was associated with increases in SVmax and COmax (P less than 0.05 for both). These findings suggest that both maximal and submaximal HCT programs can elicit improvements in cardiovascular fitness.
在32名健康中年男性（平均年龄=42.2±2.1岁）中评估了液压循环训练（HCT）对心血管（CV）功能的影响。通过阻抗心动图在训练前后评估最大有氧功率（VO2max），同时测量每搏输出量（SV）和心输出量（CO）。受试者被随机分配到非运动对照组、自行车训练组（自行车）或两个HCT组之一。训练组参加为期9周的计划，每周3天。分配到HCT组的受试者在一个有9个站点的循环训练中锻炼，每天完成3个循环。每个循环在每个站点包括三个20秒的工作间隔，工作与休息比例为1:1。一个HCT组（HCTmax）在每个工作间隔完成尽可能多的重复次数（RM）。另一个HCT组（HCTsub）以RM的70-85%进行锻炼。训练后，所有训练组的VO2max（毫升·千克-1·分钟-1）均显著增加（自行车组、HCTsub组和HCTmax组分别增加18.0%、12.5%和11.3%；P<0.05）。自行车组观察到的VO2max增加显著大于两个HCT组记录的增加（P<0.05）。对于所有三个训练组，VO2max的增加与SVmax和COmax的增加相关（两者P均<0.05）。这些发现表明，最大和次最大HCT计划都可以引起心血管适应性的改善。
