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O-27 Is there any relationship between serum vitamin d level and cardiac autonomic function in athletes?
  1. Murat Yildirim1,
  2. Melda P Yargiç1,
  3. Gürhan Dönmez1,
  4. Arzu Yildirim2,
  5. Haydar A Demirel1
  1. 1Hacettepe University, Department of Sports Medicine, Turkey
  2. 2Hacettepe University, Department of Cardiology, Turkey

Abstract

Aim Besides its relation to mortality, cardiac autonomic function has been shown to provide information about athletic performance and exercise tolerance. The relationship between cardiac autonomic dysfunction and vitamin D deficiency is not known in healthy athletes although it has been well depicted in healthy subjects. Therefore, we asked a question if serum vitamin D levels plays a role to maintain cardiac autonomic function in athletes.

Methods A total number of 89 healthy volunteers (55 athletes and 33 sedentary subjects)

were participated in this randomised case-control study. After measuring initial serum 25(OH) vitamin D concentrations, all participants underwent a submaximal exercise stress testing by using Bruce protocol. After reaching 85% of the age-predicted heart rate (220-Age), treadmill exercise has been stopped and heart rates were obtained after first, second and third minutes of recovery. Heart-rate recovery indexes (HRR1, HRR2 and HRR3) were calculated by subtracting first-, second-, and third-minutes of heart rates from the pike heart rate reached during the exercise test (ie 85% of Max HR).

Results There were no correlations between serum vitamin D levels and any of the HRR indexes neither in athletes nor in control subjects. On the other hand, when groups were divided to two based on their vitamin D levels, HRR2 index was significantly lower in low vitamin D group (<15 ng/ml) compare to high vitamin D group only in control subjects.

Conclusion These results suggest that unlike sedentary control group, the cardiac autonomic function was not affected by the vitamin D deficiency in athletes. It can be speculated that the positive effect of regular exercise on parasymphathetic and sympathetic regulation may play a role on these findings.

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