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Heart Rate Variability And Autonomic Activity In A Nonfunctional Overreached Professional Soccer Player: 2430 Board #2 June 3, 930 AM - 1130 AM

Vilamitjana, Javier J.; Lentini, Néstor A.; Verde, Pablo E.; Perez, Mario F. Jr

Medicine & Science in Sports & Exercise: May 2016 - Volume 48 - Issue 5S - p 666
doi: 10.1249/01.mss.0000486999.81412.ea
E-16 Thematic Poster - Soccer Friday, June 3, 2016, 9:30 AM - 11:30 AM Room: 110

1CENARD, National Sport High Performance Center, Bs As, Argentina. 2Faculty of Medicine of Duesseldorf University, Duesseldorf, Germany. 3FMU, Centro Universitário da Facultades Metropolitanas, San Pablo, Brazil.


(No relationships reported)

PURPOSE: In order to investigate nonfunctional overreaching (NFOR) related adaptations in the autonomic nervous system, heart rate variability (HRV) was examined in a professional soccer player (age: 28.6 years; weight: 77.4 kg; height: 177.1 cm; adiposity: 12.1 %; VO2 Max 57 ml/kg/min) who showed reduced performance in competitions, frequent muscular fatigue during some training sessions (same period), and finally getting upper respiratory tract infection (URTI).

METHODS: HRV analysis was performed once a week during three periods of competitive season: initial, NFOR state and post-recovery (5-month follow-up). Short-term recordings (5 minutes) were made with a Polar RS800CX heart rate monitor in two positions: supine (S) and 90° head-up tilt (T), immediately after awakening (match day morning). Root mean square of successive differences (RMSSD) and power spectral density were measured. LF/HF ratios in S and T positions were calculated and mean resting heart rate (RHR) was also analyzed. Seven players from the same team and with normal performances during the season were used as a control group (age: 26.6 ± 3.1 years; weight: 73.2 ± 6 kg; height: 176.7 ± 10 cm; adiposity: 12.9 ± 1.6 %; VO2 Max 55.7 ± 1.8 ml/kg/min). The typical 95% confidence interval (CI) in every HRV parameter was calculated in this group. To be diagnosed as NFOR, the subject (case) had to reveal a 95% difference with respect to the lower or upper CI limit reported in the control group. Values are expressed as mean ± SD.

RESULTS: LF/HF ratio decreased progressively throughout the competitive period in S and it was substantially different in comparison with control subjects in T during the NFOR state (0.26 ± 0.62 vs. 2.03 ± 1.25). Relevant differences of RMSSD in S (107.6 ± 20.2 vs. 74.6 ± 23.8 ms) and T (140.3 ± 15.3 vs. 61.6 ± 21.6 ms) were found in NFOR. According to this phenomenon, RHR was lower than the control group in S (45.3 ± 1.7 vs. 55.7 ± 6.5 bpm) and T (48.2 ± 2.4 vs. 59.8 ± 9.1 bpm) and returned to baseline after recovery.

CONCLUSIONS: The results suggest a sympathovagal imbalance with extensive parasympathetic modulation in a player identified as overreached. Relevant increase of RMSSD and decrease of LF/HF ratio reflect alterations in autonomic function, which should be taken into account when complete recovery is essential to prevent overtraining syndrome.

© 2016 American College of Sports Medicine