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Dark chocolate reduces endothelial dysfunction after successive breath-hold dives in cool water.

Abstract : OBJECTIVE: The aim of this study is to observe the effects of dark chocolate on endothelial function after a series of successive apnea dives in non-thermoneutral water. METHODS: Twenty breath-hold divers were divided into two groups: a control group (8 males and 2 females) and a chocolate group (9 males and 1 female). The control group was asked to perform a series of dives to 20 m adding up to 20 min in the quiet diving pool of Conflans-Ste-Honorine (Paris, France), water temperature was 27 °C. The chocolate group performed the dives 1 h after ingestion of 30 g of dark chocolate. Flow-mediated dilatation (FMD), digital photoplethysmography, nitric oxide (NO), and peroxynitrite ONOO(-)) levels were measured before and after each series of breath-hold dives. RESULTS: A significant decrease in FMD was observed in the control group after the dives (95.28 ± 2.9 % of pre-dive values, p < 0.001) while it was increased in the chocolate group (104.1 ± 2.9 % of pre-dive values, p < 0.01). A decrease in the NO level was observed in the control group (86.76 ± 15.57 %, p < 0.05) whereas no difference was shown in the chocolate group (98.44 ± 31.86 %, p > 0.05). No differences in digital photoplethysmography and peroxynitrites were observed between before and after the dives. CONCLUSION: Antioxidants contained in dark chocolate scavenge free radicals produced during breath-hold diving. Ingestion of 30 g of dark chocolate 1 h before the dive can thus prevent endothelial dysfunction which can be observed after a series of breath-hold dives.
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https://hal.univ-brest.fr/hal-00868832
Contributor : François Guerrero Connect in order to contact the contributor
Submitted on : Wednesday, October 2, 2013 - 9:01:00 AM
Last modification on : Monday, October 11, 2021 - 2:22:32 PM

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Sigrid Theunissen, Julie Schumacker, François Guerrero, Frauke Tillmans, Antoine Boutros, et al.. Dark chocolate reduces endothelial dysfunction after successive breath-hold dives in cool water.. European Journal of Applied Physiology, Springer Verlag, 2013, epub ahead of print. ⟨10.1007/s00421-013-2732-6⟩. ⟨hal-00868832⟩

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