Bussmann W D, Braune W, Kaltenbach M
Dtsch Med Wochenschr. 1979 Feb 16;104(7):248-52. doi: 10.1055/s-0028-1103879.
Repeat exercises (three hours apart) on a bicycle ergometer and a vertical step-ladder were performed in a randomised series on 79 subjects: 13 doctors, 44 patients and 22 sportsmen. Duration of exercise was on average 250% longer in the three groups on the step-ladder than the bicycle. Correspondingly, exercise-pulse sums, recovery-pulse sums and exercise indices were two-and-a-half to three times higher than on bicycle ergometry. As a sign of comparability of the exercise by the two methods there was, on average, no significant difference with regard to the final heart rate, although duration of exercise was longer on the step-ladder. 67% of subjects discontinued the exercise because of peripheral muscle fatigue on the bicycle ergometer, compared with only 8% on the step-ladder. During bicycle ergometry lactate concentration rose by 6.7 mmol/l compared with only 0.78 mmol/l during step-ladder exercise. These results indicate that the value of bicycle ergometry exercise is limited by muscle fatigue in the legs: step-ladder exercise can be extended much longer. The practical significance is that patients with coronary heart disease especially have symptoms and/or ECG changes of ischaemia only at higher levels of physical exercise.
对79名受试者进行了随机分组实验，他们在自行车测力计和垂直阶梯上重复进行锻炼（每次间隔三小时），其中包括13名医生、44名患者和22名运动员。在垂直阶梯上锻炼的三组人员，其锻炼持续时间平均比在自行车上长250%。相应地，锻炼脉搏总和、恢复脉搏总和以及锻炼指数比在自行车测力计上高出2.5至3倍。作为两种锻炼方法具有可比性的一个标志，尽管在垂直阶梯上的锻炼持续时间更长，但最终心率平均没有显著差异。67%的受试者因自行车测力计锻炼导致外周肌肉疲劳而停止锻炼，相比之下，在垂直阶梯锻炼中这一比例仅为8%。在自行车测力计锻炼期间，乳酸浓度上升了6.7 mmol/l，而在垂直阶梯锻炼期间仅上升了0.78 mmol/l。这些结果表明，自行车测力计锻炼的价值受到腿部肌肉疲劳的限制：垂直阶梯锻炼可以持续更长时间。实际意义在于，尤其是冠心病患者仅在更高强度的体育锻炼时才会出现缺血症状和/或心电图变化。
