心臓律動性へ与える運動の影響

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200 of heart interbeat intervals (R-R intervals) of a man at prone position was expressed as a histograph by using SIGNAL PROCESSOR (Sanei Sokki, Co. Ltd.). The histograph was stable and individually different, and divided into two components : Mean of R-R interval times; T_1,which was obtained at peak of the histograph, and maximum fluctuation time; T_2,which was a length of the base line of the histograph. Characteristics of R-R interval histograph was studied by changes in the histograph at rest in sports students, sleep and exercise. The obtained results were as follows : 1. Mean and standard deviation of T_1 and T_2 times in 180 male sports students who majored physical education were 0.97±0.147 sec., 0.263±0.1293 sec., respectively. 2. There were four types of the histographs and each histograph was statistically independed : Type I; T_1=0.933±0.147 sec. and T_2=0.126±0.0583 sec., Type II; T_1=0.940±0.124 sec. and T_2=0.220±0.084 sec., and there was significant prolongation in T_2 between type I and II (p<0.001), type III; T_1=1.045±0.142 sec. and T_2=0.369±0.1000 sec., and both of T_1 and T_2 was longer than these of type II, and type IV had diphasic histographs. 3. Appearance of each type was different in control, sprinters (sprinters, javelin throwers, and jumpers), long distance runners and other subjects (volleyball, basketball, rugby, soccer, gymnastics and Kendo). 44.8% of control belonged to the type II. In the long distance runners, type II decreased and inversely type I and IV increased to 29.7% and 16.6%, respectively. In the sprinters, type II was 47.6% and type III increased to 38.1%. In the other subjects, type III increased to 55.6% and inversely type II was 22.2%. 4. There was higher relationship between T_1 and resting heart rate in the long distance runners, but between T_2 and heart rate. 5. T_1 and T_2 relationship in the histograph was different in each type; these correlation coefficients in type I, II, III and IV were -0.49 (0.02<p<0.05), 0.06,and 0.43 (p<0.01), respectively. 6. In daily variation of the histograph, T_1 and T_2 prolonged at night, but T_2 extremely prolonged in the early morning. Awakefullness delayed appearance of T_1 and T_2 prolongations and eapecially T_2 prolongation was surpressed extremely in the wakefullness. 7. T_1 and T_2 relationship in each sports students was different. There were not correlation in long distance runners and control. But in other subjects and sprinters high corrlelations were observed, 0.741 (p<0.001), and 0.487 (0.02<p<0.05), respectively. 8. At begining of exercise, T_1 and T_2 were shortened quickly to about 20% and 80% respectively and relative change of T_2 was greater than T_1.

心臓律動性へ与える運動の影響

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