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THE JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS

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Original articles  BODY COMPOSITION, SPORT NUTRITION AND SUPPLEMENTATION (ergogenics)


The Journal of Sports Medicine and Physical Fitness 2006 June;46(2):257-64

Copyright © 2006 EDIZIONI MINERVA MEDICA

language: English

Prooxidant-antioxidant equilibrium in rowers: effect of a single dose of vitamin E

Zembron-Lacny A., Szyszka K., Sobanska B., Pakula R.

Department of Medical Sciences, Faculty of Physical Culture University School of Physical Education of Poznan Gorzow Wlkp., Poland


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Aim. The purpose of this research was to explain whether a single dose of vitamin E influences on disturbances of pro-oxidant-antioxidant equilibrium induced a laboratory 2 000 m rowing test.
Methods. The athletes were divided into two groups: vitamin E (1.000 mg α-tocopherol acetate) and P (placebo: cod-liver oil) supplemented 3 h before exercise. In the subjects’ blood levels of following parameters were estimated: superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx), lipid peroxidation products (TBARS) and protein carbonyls (PC). Creatine kinase (CK) and β-glucuronidase (βG) activities were also measured as markers of muscle damage.
Results. The applied exercise at maximal intensity (lactate: vitamin E=14.39±1.77 mmol/L, P=14.09±1.4 mmol/L) caused significant changes in the tested parameters in both groups: SOD (vitamin E ↓30%, P ↓50%), CAT (vitamin E ↑70%, P ↑12%), GPx (vitamin E ↑49%, P ↑45%), TBARS (vitamin E ↑70%, P ↑71%), PC (vitamin E ↑41%, P ↑78%), CK (vitamin E ↑19%, P ↑32%), βG (vitamin E ↑42%, P ↑47%). The P/A ratio (TBARS/SOD+CAT+GPx) was significantly lower in vitamin E in comparison with placebo, but after 30 min and 24 h restitution it returned to pre-exercise level. Between P/A ratio and PC concentration there was observed positive correlation (P<0.001). No effect of vitamin E on CK and βG activities were observed.
Conclusion. A single dose of 1 000 mg vitamin E enhances oxidative defense thus attenuates oxidative damage but it is not so much relevant to recommend the antioxidant supplementation by rowers.

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