تاثير چرخه شبانه روزي بر پاسخ سگمان ST الكتروكارديوگرام قلب ورزشكاران به آزمون زيربيشينه PWC195

Effect of circadian rhythm on athleteʹs ECG (ST segment) response to PWC195 test

The purpose of the present study was to investigate the effect of diurnal variation on athleteʹs ECG (ST segment) response to PWC195 test. Thirteen subjects (age: 23.7+2.3 yr; weight: 69+4.2 kg; height: 176.5+2.3 cm) were selected from students of physical education .Initially, resting ECG of the subjects was recorded at the morning (8:00) which was followed by PWCi95 test. Morning ECG was recorded immediately after finishing the test. Finally, at the evening of the same day (17:00) subjects performed the PWC 195 test and immediately after the test the ECG (evening ECG) was recorded. In comparison to resting ECGs, the responses of the ST segment to PWC 195 test at the morning and evening were significantly different. However, there was no significant difference between morning and evening responses (rest: 0.053+0.017; morning: 0.023+0.011; evening: 0.000+0.004 mv; P<0.05). We concluded that 1) PWC195 test reduces the voltage of the ST segment but this reduction is not pathologically significant (