Vitamin C supplementation influences the antioxidant response and nitric oxide handling of erythrocytes and lymphocytes to diving apnea.
OBJECTIVE
We have investigated the influence of vitamin C diet supplementation on the antioxidant response and nitrite levels in lymphocytes and erythrocytes during diving apnea.


METHODS
Seven male professional apnea divers participated in a double blind crossover study. Divers were randomly assigned to either vitamin C supplemented or placebo groups. The subjects did not take any other supplements than the ones provided for this study.


METHODS
One group was supplemented with vitamin C capsules (1 g per day) for 7 days while the other group took a placebo composed of lactose. The usual dietary habits of participants were assessed using a self-reported 7-days 24-h recall before the day of the study. Blood samples were taken under basal conditions, immediately after diving apnea for 4 h and after 1 h of recovery.


RESULTS
Catalase activity increased in erythrocytes (23%) and superoxide dismutase increased in lymphocytes (35%) during the recovery only in the placebo group. Lymphocyte ascorbate levels increased in the supplemented group after diving (85%) and maintained high at recovery. Plasma nitrite levels increased about twofold in both groups during the recovery. Erythrocyte nitrite levels increased after diving (50%) and about twofold during the recovery in the supplemented group. Nitrite levels and iNOS levels in lymphocytes were higher in the placebo group than in the supplemented during the recovery. Erythrocyte carbonyl derivates were unchanged in all situations.


CONCLUSIONS
Vitamin C supplementation influenced the antioxidant response and NO handling in erythrocytes and lymphocytes to the oxidative stress induced by hypoxia-reoxygenation.
Sureda
A
A
Laboratori de Ciències de l'Activitat Física, Departament de Biologia Fonamental i Ciències de la Salut, Universitat de les Illes Balears, Spain.
Batle
J M
JM
Tauler
P
P
Ferrer
M D
MD
Tur
J A
JA
Pons
A
A
D000975:Antioxidants / Q000008:administration & dosage* / Q000378:metabolism; D001049:Apnea / Q000097:blood / Q000378:metabolism*; D001205:Ascorbic Acid / Q000008:administration & dosage* / Q000378:metabolism; D002374:Catalase / Q000378:metabolism; D015687:Cell Hypoxia / Q000187:drug effects*; D018592:Cross-Over Studies; D019587:Dietary Supplements; D004242:Diving; D004311:Double-Blind Method; D004912:Erythrocytes / Q000201:enzymology / Q000378:metabolism*; D006801:Humans; D008214:Lymphocytes / Q000201:enzymology / Q000378:metabolism*; D008297:Male; D009569:Nitric Oxide / Q000378:metabolism; D052247:Nitric Oxide Synthase Type II / Q000378:metabolism; D010084:Oxidation-Reduction; D018384:Oxidative Stress / Q000187:drug effects* / Q000502:physiology; D013482:Superoxide Dismutase / Q000378:metabolism
D000975:Antioxidants; D009569:Nitric Oxide; D002374:Catalase; D052247:Nitric Oxide Synthase Type II; D013482:Superoxide Dismutase; D001205:Ascorbic Acid