Länsimies E A, Rauhala E
Aviat Space Environ Med. 1986 Dec;57(12 Pt 1):1158-64.
The responses of heart rate and blood pressure to passive head-up tilting were assessed twice with an interval of 2 months in 100 healthy, middle-aged men. Then the subjects were randomly allocated into training or non-training groups. The intervention period of 4 months was successfully completed by 85 subjects. Mean, indirectly-determined oxygen uptake capacity increased in the training group only. The amplitude of the change in heart rate from supine to tilting and back again was used as the sign of orthostatic tolerance (OT). OT was similar in the training and non-training groups. When the subjects were grouped according to aerobic fitness, no differences in the OT could be observed. Changes in fitness during the intervention did not induce any changes in orthostatic tolerance. When the whole group was divided according to the OT or change in OT, no significant differences of changes in aerobic fitness were observed. It is concluded that in healthy, ambulatory, middle-aged men orthostatic tolerance and aerobic fitness are not correlated.
对100名健康中年男性的心率和血压对被动头高位倾斜的反应进行了两次评估，间隔为2个月。然后将受试者随机分为训练组或非训练组。85名受试者成功完成了为期4个月的干预。仅训练组间接测定的平均摄氧量增加。从仰卧位到倾斜位再回到仰卧位时心率变化的幅度用作直立耐受（OT）的指标。训练组和非训练组的OT相似。当根据有氧适能对受试者进行分组时，未观察到OT有差异。干预期间适能的变化未引起直立耐受的任何变化。当根据OT或OT变化对整个组进行划分时，未观察到有氧适能变化的显著差异。得出的结论是，在健康、能走动的中年男性中，直立耐受与有氧适能不相关。
