| Acute Effect of Knee Eccentric Contraction with Blood Flow Restriction on Corrected QT Interval During Repetition and Recovery in Healthy Men |
| Paper ID : 1758-SSRC-13TH |
| Authors |
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Alireza Kashef *1, Alireza Zandinezhad2, Farshad Ghazalian2, Fereshteh Shahidi3 1Department of Exercise Physiology, Faculty of Physical Education and Sports Sciences, Shahid Rajaee Teacher Training University, Tehran, Iran 2گروه فیزیولوژی ورزش، دانشکده علوم انسانی، واحد علوم تحقیقات تهران، دانشگاه آزاد اسلامی، تهران، ایران 3گروه فیزیولوژی ورزش، دانشکده تربیت بدنی و علوم ورزشی، دانشگاه تربیت دبیر شهید رجایی، تهران، ایران |
| Abstract |
| Background: The purpose of this study was to investigate the acute effect of eccentric knee contractions with BFR on the corrected QT interval (QTc) during repetition and recovery in healthy men to determine a cardiac safe resistance exercise for people who cannot exercise with high intensity because of diseases or disability. Methods: Eight healthy men (age 27.8±2.8 years) were randomly divided into two groups through the crossover method. One group performed the method of muscle contraction with blood flow restriction with an intensity of 30% of MVC (maximum voluntary contraction), and the other group completed the same program without the BFR program under 70% of MVC. Training sessions were performed under 30% of MVC with BFR with 30, 15, 15, and 15 repetitions, assigning 60-second recovery intervals for each repetition. The lead II of electrocardiogram was recorded by electrocardiograph belt. QT, QTc, and RR intervals were measured at each repetition and recovery. The t-test was used to assess the differences of all variables between training protocol with and without BFR. Results: A significant difference was observed between training with and without BFR in QT interval in the first recovery, RR interval in the third 15 repetitions, and QTc interval in the first 15 repetitions (P=0.006, P=0.03, and P=0.006, respectively). Conclusion: The cardiac response to BFR training was nearly similar to that without BFR. In low-intensity BFR training, the cardiovascular system responded faster but remained stable throughout exercise. In high-intensity non-BFR training, the cardiovascular system responded with delay and raised by increasing training duration. |
| Keywords |
| “Resistance exercise” “Electrocardiogram” “BFR” |
| Status: Abstract Accepted (Oral Presentation) |
