Schulpis KH, Reclos GJ, Parthimos T, Parthimos N, Gavriilidis A, Tsakiris S. L-cysteine supplementation protects the erythrocyte glucose-6-phosphate dehydrogenase activity from reduction induced by forced training.
Clin Biochem 2006;
39:1002-6. [PMID:
16959232 DOI:
10.1016/j.clinbiochem.2006.06.006]
[Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2006] [Revised: 06/08/2006] [Accepted: 06/21/2006] [Indexed: 11/23/2022]
Abstract
BACKGROUND
L-cysteine (L-cys) is implicated in the reduction of free radical production.
AIM
To investigate the effect of training and L-cys supplementation on the erythrocyte glucose-6-phosphate dehydrogenase (G6PD) activity.
METHODS
Blood was obtained from 10 basketball players pre-game (group A), post-game (group B) and after 1 week on L-cys (0.5 g/24 h orally) supplementation pre- (group C) and post-training (group D). Total antioxidant status (TAS) and G6PD activity were evaluated with commercial kits.
RESULTS
TAS increased in the groups with l-cys addition (group C and group D). Post-exercise, TAS and G6PD activity were remarkably higher (1.48+/-0.12 mmol/L, 8.9+/-1.7 U/g Hb, respectively) in group D than those in group B (0.92+/-0.10 mmol/L, 4.8+/-1.6 U/g Hb, p<0.01). G6PD activity positively correlated with TAS (r=0.70, p<0.001 pre- and r=0.61, p<0.001 post-training) in all the studied groups.
CONCLUSIONS
G6PD activity is lowered by training probably due to free radical action. L-cys supplementation may protect G6PD activity from reduction by increasing total antioxidant capacity and glutathione production. G6PD activity should be evaluated in the blood of athletes of Mediterranean origin and female G6PD-deficient heterozygotes.
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