Journal of Knowledge & Health in Basic Medical Sciences1735-577X14420200316Cardiac Electrophysiological Changes to Two Types of Severe and Increasingly Exhaustion Periodic Exercise in Non-Athletic Men121810.22100/jkh.v14i4.2298فارسیMehdi0000-0002-0844-5800Moradi1*1- Dept. of Physical Education, Arak Branch, Islamic Azad University, Arak, Iran.. firstname.lastname@example.orgArash0000-0002-3920-9704Feizbakhsh2Mojtaba0000-0003-2945-2847Khansooz3Mohsen0000-0002-3565-4851Akbarpour4201910012019122720191213Introduction: The purpose of this study was to compare the effect of two types of intense and exhausting periodic exercise on cardiac electrophysiological changes in non-athlete men.Methods: This quasi-experimental study and the statistical population of this study included non-athlete people with age range 33.93±8.58 years. Of these, 16 were selected through available sampling. Subjects performed the Bruce protocol in a 20-m distance in the intense intermittent group (4 sessions of 30 s activity with maximum intensity and 2 minutes of inactive rest). Wavelength P, QRS, T, as well as R to R frequency, QT segment, P-R and ST segment variations were measured for P and QRS wave height intensities. All variables in this study were taken at rest, immediately after exercise and in recovery period (two hours after exercise). Data was analyzed by SPSS software using ANOVA and LSD tests.Results: There was no significant difference in QT, P-R, QRS and P values between the two training groups.Conclusion: The present study showed that vigorous training such as fatigue training can cause changes in cardiac structural activity. It is recommended to avoid the most intense and exhausting exercises for people who are not ready to adapt to heart rate.