104 QTc changes and left ventricle remodeling in young teenage professional football players
M Zdravkovic1, J Perunicic2, M Krotin1, M Ristic2, M Deljanin-Ilic3, D Zdravkovic1, N Milic2
1
University Hospital Center, Bezanijska Kosa, Belgrade, Serbia, 2Institute for Cardiovascular Diseases, Belgrade, Serbia, 3Institute of Cardiology, University of Nis, Niska Banja, Serbia
Topic: Sports cardiology
Purpose: QTC interval prolongation is present in adult athlete's heart and has a strong correlation to left ventricle hypertrophy (LVH). On the other hand, in early stage of physiological athlete's heart remodeling there is no LVH, but left ventricle dilatation. the objective of this article is to assess whether LVD due to physical training has correlation with QTc duration in teenage professional football players.
Methods: 94 teenage football players aged 12.85 (0.84), range 12–14 years were screened by ECG and echocardiography at a tertiary referral cardio centre. they were from national professional soccer Premier League (at least 7 training hours/week). Control group consisted of 47 age-matched healthy volunteers with sedentary life style (less then 2 training hours/week). All athletes and volunteers from control group had no symptoms, none of them had syncope and physical findings were normal. QTc values and left ventricle dimensions were compared in these two groups.
Results: Mean QTc in athletes was significantly smaller (399.78 +/–13.27 msec) compared to mean QTc in control group (419.89 +/– 13.07 msec), (p>0.001). QTc interval had strong positive correlation to left atrium dilatation. LV dilatation, LV mass and LV mass index. there was no correlation between QTc interval and LV wall thickness, although none of the participants had LV hypertrophy more then 12 mm.
Conclusions: this study showed that QTc interval is shortened even in in early stage of athlete's heart, correlating with LV dilatation. Sport induced electrophysiological changes of autonomous nervous system are present even in young adolescent professional soccer players age 12 to 14 years.
P105
Electromyostimulation and its influence on maximum oxygen consumtion in patients with coronary artery disease
A Fruend1, D Fritzsche2, M Cadus1, KP Mellwig3, F Van Buuren3, J Gummert2, D Horstkotte3
1
Department of Physiotherapy, Heart and Diabetes Center, North Rhine-Westphalia, Ruhr University Bochum, Bad Oeynhausen, Germany, 2Department of thorac Cardiovasc Surg, Heart and Diabetes Center NRW, Ruhr University Bochum, Bad Oeynhausen, Germany, 3Department of Cardiology, Heart and Diabetes Center, North Rhine-Westphalia, Ruhr University Bochum, Bad Oeynhausen, Germany
Topic: Sports cardiology
Purpose: Patients with coronary artery disease often experience an impaired performance in dynamic types of physical exercise (e.g. jogging, cycling etc.) due to a fast increase in heart rate. therefore, an effective training level is often impossible. In addition, immobilisation because of chronic heart failure (CHF) as well as orthopaedic diseases are reasons for a lifestyle without sports. With the new technique of electromyostimulation (EMS) muscles may be trained without typical physical activity because muscle contraction is induced by electrical signals. In our setting we wanted to investigate the influence of EMS on oxygen uptake at anaerobic threshold (VO2AT), an accepted parameter for physical fitness.
Methods: Using the Miha-Bodytec stimulation system eight major muscle groups are activated simultaneously. In our trial muscles were stimulated for 4 seconds followed by 4 seconds of recovery (impulse frequency 80 Hz). the intensity of the impulse (mAmpere) was chosen by the patient himself. the aim was a sufficient activation of the muscles without the feeling of pain due to “overcontraction”. the training was performed twice a week for 20 minutes under controlled conditions at our hospital. A first evaluation of the data was done after 10 weeks. VO2AT was measured by spiroergometry before and after the 20 training sessions.
Results: After 10 weeks of training there was a significant increase of the VO2AT from 19.39 ± 5.3 ml/kg/min to 24.25 ± 6.34 ml/kg/min representing an increase of 25.4 %. the maximum individual increase of VO2AT was 96 %. Blood pressure, especially diastolic parameters, could be reduced during our study.
Conclusion: EMS is an effective new tool to improve oxygen uptake in patients who are unable to perform endurance training due to cardiac diseases or other comorbidities.
