EFFECT OF EXTREME ANAEROBIC EXERCISE EVENT ON AUTONOMIC NERVOUS SYSTEM ACTIVITY IN PROFESSIONAL RUNNERS
Journal Title: Medycyna Sportowa - Year 2007, Vol 23, Issue 4
Abstract
[b]Background. [/b]The Wingate test is used in the evaluation of anaerobic power in professional athletes. The influence of this test on autonomic nervous system (ANS) activity is not fully explained. The aim of the study was to evaluate the influence of such procedure on ANS activity in young healthy athletes.[b]Material and methods. [/b]Nine professional runners aged 17.1 years (16-19) were included in the study. The ANS parameters (baroreflex sensitivity - BRS_WBA, short-term heart rate variability - HRV: SDNN, PNN50, RMSSD, TP, LF, LFnu, HF, HFnu, LF/HF and mean HP were analyzed on the basis of 10-minute systolic arterial pressure (SAP) and heart period (HP) records during controlled breathing (0.23 Hz). BRS_WBA, HRV indices and mean HP were analyzed twice: before (examination 1) and within 1 hour after the Wingate test (examination2).[b]Results. [/b]Statistically significant decrease in BRS_WBA in examination 2 in comparison to examination 1 was found: 9.9+/-3.9 vs 17.8+/-10.1 ms/mmHg respectively (p = 0.038). SDNN, PNN50, RMSSD, HF and HFnu were significantly lower in examination 2 comparing to examination 1 (p<0.05): 94 40 and 65 25 ms, 57 24 and 37 19%, 109 64 and 62 26 ms, 7085 7241 and 4360 2993 ms2, 79 12 and 65 15 NU respectively. Similar trend was established in mean HP: from 965 121 to 860 74 ms (p<0.05). LFnu and LF/HF increased significantly: 21 12 and 35 15 NU, 0.30 0.23 and 0.62 0.37 respectively (p<0.05). LF did not change significantly during the examinations (examination 1 - 1270 7241 and examination 2 - 1407 1223 ms2, p>0.05).[b]Conclusions. [/b]Extreme anaerobic physical exertion (Wingate test) leads to decrease in parasympathetic activity and to increase in sympathetic activity of ANS in young healthy runners. These changes persist at least one hour after exertion.
Authors and Affiliations
Ludmiła Daniłowicz-Szymanowicz, Grzegorz Raczak, Małgorzata Szwoch, Wojciech Ratkowski, Antoni Toruński
Keywords
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