Studies of The Simple Medical Check Method by Index with Change of Cardiac Function in Physical Exercise.

运动时ST段持续下降的紊乱发生在心率170次/分左右，并考虑了心率增加和运动时间对ST段持续下降的影响。为了阐明这些影响，用自行车测功仪对健康青年受试者进行了5分钟和10分钟两种运动，使其达到约170次/分。记录并测量ECG、心率、心输出量和呼吸率。采用Quinton. Co Ltd.）。所得结果如下：1. 5分钟和10分钟运动时心率和ST段压低的平均值为20次/分，10次/分，-0.55 mm/分，和-0.18mm/min，2. ST段压低有较大的个体差异，ST段压低的平均值有较大的标准差。然而，尽管在5分钟和10分钟之间ST段压低没有显著差异。心率达到150次/分，超过150次/分，多数受试者在运动5分钟时ST段压低程度高于运动10分钟时。锻炼身体。在相同心率水平下，运动5分钟和10分钟时，心输出量、呼吸频率和血压无显著性差异，由此可见，在相同心率下，150次/分钟以上，提示：运动时心率急剧增加会引起较强ST段压低，因此，用知觉评价法进行运动时，应保证足够的运动时间以达到目标心率。

Disturbance of contineous decrease of ST level during exercise occured at about 170 beats-min. of heart rate and influences of the increased heart rate and exercise time on it were considered. To clarify these influences, two kinds of exercise, 5-min. and 10-min. of exercises to attain an about 170 beats/ min, were loaded to young healthy subjects by using bicycle ergometer. ECG, heart rate, cardiac output, and respiration rate were recorded and measured. ST depression and ST slope on ECG were analyzed by ST-segment computer (Quinton. Co Ltd.). Obtained results were as lollows;1. Means of heart rate and ST depression during 5-min. and 10-min. exercises were 20beats/min., 10 beats/min, -0.55mm/min., and -0.18mm/min., respectively.2. ST depression had a large individual difference and mean of ST depression had a large standard deviation. However, despite of there were not significant differences in ST depressions between 5 min. and 10min. exercises up to 150 beats/min. of heart rate,above 150 beats/min., many subjects showed higher ST depressionsin 5 min. exercise than those in 10min. exercise.3. At same heart rate level during exercise, there were not significant differences in cardiac output, respiration rate, and blood pressure between 5-min. and 10-min. exercisis.From these results, different ST depressions at same heart rate, above 150 beats/min., indicate that as acute increase of heart rate by exercise introduce a stronger ST depression, enough exercise time to aftain target heart rate should be taken in exercise by perceptive evaluation method.