Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine (2010) 09, 176 - 182

Research article
Heart Rate Variability Before and After Cycle Exercise in Relation to Different Body Positions
Otto F. Barak1, , Djordje G. Jakovljevic2, Jelena Z. Popadic Gacesa1, Zoran B. Ovcin3, David A. Brodie4, Nikola G. Grujic1
Author Information
1 Medical School, University of Novi Sad, Novi Sad, Serbia
2 Newcastle Magnetic Resonance Centre, Muscle Performance and Exercise Training Laboratory, Institute for Ageing and Health, Newcastle University, UK
3 University of Novi Sad, Novi Sad
4 Buckinghamshire New University, UK

Otto F. Barak
‚úČ Department of Physiology, Medical School, University of Novi Sad, 3, Hajduk Veljko street, 21000 Novi Sad, Serbia
Email: ottompotom@uns.ac.rs
Publish Date
Received: 01-12-2009
Accepted: 08-01-2010
Published (online): 01-06-2010
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ABSTRACT

The purpose of this study was to assess the effect of three different body positions on HRV measures following short-term submaximal exercise. Thirty young healthy males performed submaximal cycling for five minutes on three different occasions. Measures of HRV were obtained from 5-min R to R wave intervals before the exercise (baseline) and during the last five minutes of a 15 min recovery (post-exercise) in three different body positions (seated, supine, supine with elevated legs). Measures of the mean RR normal-to-normal intervals (RRNN), the standard deviation of normal-to-normal intervals (SDNN), the root mean square of successive differences (RMSSD) and the low-frequency (LF) and the high-frequency (HF) spectral power were analyzed. Post-exercise RRNN, RMSSD were significantly higher in the two supine positions (p < 0. 01) compared with seated body position. Post-exercise ln LF was significantly lower in the supine position with elevated legs than in the seated body position (p < 0.05). No significant difference was found among the three different body positions for post-exercise ln HF (p > 0.05). Post-exercise time domain measures of HRV (RRNN, SDNN, RMSSD) were significantly lower compared with baseline values (p < 0.01) regardless body position. Post-exercise ln LF and ln HF in all three positions remained significantly reduced during recovery compared to baseline values (p < 0.01). The present study suggests that 15 minutes following short-term submaximal exercise most of the time and frequency domain HRV measures have not returned to pre-exercise values. Modifications in autonomic cardiac regulation induced by body posture present at rest remained after exercise, but the post-exercise differences among the three positions did not resemble the ones established at rest.

Key words: Heart rate variability, recovery, exercise


           Key Points
  • Whether different body positions may enhance post-exercise recovery of autonomic regulation remains unclear.
  • The absence of restoration of HRV measures after 15 minutes of recovery favor the existence of modifying effects of exercise on mechanisms underlying heart regulation.
  • On the basis of discrepancies in HRV measures in different body positions pre- and post-exercise we argue that the pace of recovery of cardiac autonomic regulation is dependent on body posture.
 
 
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