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Title: | Differential influence of vitamin C on the peripheral and cerebral circulation after diving and exposure to hyperoxia | Authors: | Otto Barak Caljkusic K. Hoiland R. Ainslie P. Thom S. Yang M. Jovanov P. Dujic Z. |
Keywords: | cerebral blood flow;flow-mediated dilation;hyperoxia;transcranial Doppler ultrasound | Issue Date: | 1-Oct-2018 | Journal: | American journal of physiology. Regulatory, integrative and comparative physiology | Abstract: | We examined if the diving-induced vascular changes in the peripheral and cerebral circulation could be prevented by oral antioxidant supplementation. Fourteen divers performed a single scuba dive to eighteen meter sea water for 47 min. Twelve of the divers participated in a follow-up study involving breathing 60% of oxygen at ambient pressure for 47 min. Before both studies, participants ingested vitamin C (2 g/day) or a placebo capsule for 6 days. After a 2-wk washout, the study was repeated with the different condition. Endothelium-dependent vasodilator function of the brachial artery was assessed pre- and postintervention using the flow-mediated dilation (FMD) technique. Transcranial Doppler ultrasound was used to measure intracranial blood velocities pre- and 90 min postintervention. FMD was reduced by ∼32.8% and ∼21.2% postdive in the placebo and vitamin C trial and posthyperoxic condition in the placebo trial by ∼28.2% ( P < 0.05). This reduction in FMD was attenuated by ∼10% following vitamin C supplementation in the hyperoxic study ( P > 0.05). Elevations in intracranial blood velocities 30 min after surfacing from diving were reduced in the vitamin C study compared with the placebo trial ( P < 0.05). O2 breathing had no postintervention effects on intracranial velocities ( P > 0.05). Prophylactic ingestion of vitamin C effectively abrogated peripheral vascular dysfunction following exposure to 60% O2 but did not abolish the postdive decrease in FMD. Transient elevations of intracranial velocities postdive were reduced by vitamin C. These findings highlight the differential influence of vitamin C on peripheral and cerebral circulations following scuba diving, which are only partly mediated via hyperoxia. | URI: | https://open.uns.ac.rs/handle/123456789/1270 | ISSN: | 0363-6119 | DOI: | 10.1152/ajpregu.00412.2017 |
Appears in Collections: | MDF Publikacije/Publications |
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