Vitamin D Status of Submariners during Patrol

Schlichting, Christine L; Styer, David J

doi:10.21236/ada206776

Cited by 4 publications

(5 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The power of the aFRG flow equations has by now been demonstrated in various model studies where mesonic and fermionic spectral functions have been computed [37][38][39][40][41], recently also selfconsistently [42]. In order to assess truncation effects, one can furthermore compare with classical-statistical lattice simulations of spectral functions [43,44] which are able to capture exactly their universal critical behavior in the vicinty of continuous phase transitions.…”

Section: Introductionmentioning

confidence: 99%

Fluctuating vector mesons in analytically continued functional RG flow equations

Jung

Smekal

2019

Phys. Rev. D

View full text Add to dashboard Cite

In this work we study contributions due to vector and axial-vector meson fluctuations to their in-medium spectral functions in an effective low-energy theory inspired by the gauged linear sigma model. In particular, we show how to describe these fluctuations in the effective theory by massive (axial-)vector fields in agreement with the known structure of analogous single-particle or resonance contributions to the corresponding conserved currents. The vector and axial-vector meson spectral functions are then computed by numerically solving the analytically continued functional renormalization group (aFRG) flow equations for their retarded two-point functions at finite temperature and density in the effective theory. We identify the new contributions that arise due to the (axial-)vector meson fluctuations, and assess their influence on possible signatures of a QCD critical endpoint and the restoration of chiral symmetry in thermal dilepton spectra.

show abstract

Section: Introductionmentioning

confidence: 99%

Fluctuating vector mesons in analytically continued functional RG flow equations

Jung

Smekal

2019

Phys. Rev. D

View full text Add to dashboard Cite

show abstract

“…One study found that over a 68-d patrol, 25-(OH) vitamin D levels dropped signifi cantly, whereas parathyroid hormone levels increased ( 21 ). Additionally, Schlichting et al ( 77 ) also reported a decrease in 25-(OH) vitamin D levels over a 2-mo deployment. Moreover, a recent study of Israeli submariners found that a 30-d submersion led to decreased bone density and 25-(OH) levels, but it also led to decreased circulating parathyroid hormone levels and bone remodeling markers, along with increased circulating calcium levels ( 44 ).…”

Section: Ways To Mitigate the Potential For Hypercortisolism And Its mentioning

confidence: 94%

Hypercortisolism as a Potential Concern for Submariners

Reini¹

2010

aviat space environ med

View full text Add to dashboard Cite

Cortisol is a stress-response hormone that is important for survivability in fight or flight situations. Hypercortisolism is a state of chronically elevated cortisol levels due to a failure to return to, or maintain baseline levels. It is a condition that is often undiagnosed and can aid in the development of many physiological and psychological health problems. Some of the health ailments associated with hypercortisolism include metabolic syndrome, decreases in bone mineral density, and depression. Chronic stress and sleep deprivation are two common causes of hypercortisolism, both areas of concern within the submarine community. This review discusses the etiology of hypercortisolism and the likelihood of submariner vulnerability to the condition along with health problems associated with it. Lastly, strategies to prevent chronic elevation of cortisol and mitigate the potential health risks associated with the condition are covered.

show abstract

“…33 Similar observations were made by Schlichting and Styer in a report from the Naval Submarine Medical Research Laboratory based on a study with 22 submariners aged 18-35 years from a crew of an American fleet ballistic nuclear-powered submarine about to go on a 2-month deployment. 44 Eleven received a daily multivitamin-mineral supplement (with 10.0 mg ergocalciferol) and 11 received a non-nutritional placebo. 44 Serum 25(OH)D levels fell between pre-patrol (November) and mid-patrol (1 month; 38% in the placebo group and 17% in the supplemented group) and end-patrol (2 months; 40% in the placebo group and 3% in the supplemented group) and increased after the crew had returned to the base (in both groups, serum 25(OH)D levels 30 days post-patrol were above all patrol values and also above pre-patrol values).…”

Section: Systematic Reviewmentioning

confidence: 99%

“…44 Eleven received a daily multivitamin-mineral supplement (with 10.0 mg ergocalciferol) and 11 received a non-nutritional placebo. 44 Serum 25(OH)D levels fell between pre-patrol (November) and mid-patrol (1 month; 38% in the placebo group and 17% in the supplemented group) and end-patrol (2 months; 40% in the placebo group and 3% in the supplemented group) and increased after the crew had returned to the base (in both groups, serum 25(OH)D levels 30 days post-patrol were above all patrol values and also above pre-patrol values). 44 Gasier et al used a higher dose of 2000 IU/day but, although the group receiving 2000 IU/day showed the greatest change in serum 25(OH)D levels following the patrol (+13 nmol/L), this was not statistically significant (mean changes in serum 25(OH)D per 100 IU supplemented vitamin D of 0.5±1.3 and 0.7±0.7 nmol/L for the 1000 and 2000 IU/day groups, respectively).…”

Section: Systematic Reviewmentioning

confidence: 99%

Vitamin D status in active duty Navy military personnel: a systematic review

et al. 2023

View full text Add to dashboard Cite

ObjectivesActive duty Navy military personnel are prone to vitamin D deficiency due to an occupational environment detrimental to sunlight exposure. The main objective of this systematic review is to provide a worldwide overview of vitamin D status in this population.MethodsThe Condition, Context, Population (CoCoPop) mnemonic was used to define the inclusion criteria (vitamin D status; all contexts; active duty Navy military personnel). Studies with recruits or veterans were excluded. Scopus, Web of Science and PubMed/Medline databases were searched from inception to 30 June 2022. Joanna Briggs Institute and Downs & Black checklists were used for quality assessment and data were synthesised in narrative and tabular formats.ResultsThirteen studies published between 1975 and 2022 and conducted in northern hemisphere Navies, including mainly young and male service members, were included. The prevalence of vitamin D deficiency was globally reported as significant. Nine studies included a total of 305 male submariners who performed 30–92 days submarine patrol and reported the effect of sunlight deprivation in the decrease of vitamin D levels.ConclusionsThis new systematic review underlines the high prevalence of vitamin D deficiency in the Navy, especially in submariners, and the need to implement measures to prevent vitamin D deficiency. Serum 25(OH)D data available and the heterogeneity of the studies limited a pooled analysis. Most studies included only submariners, which may limit generalisability to all active duty Navy military personnel. Further research on this topic should be promoted.PROSPERO registration numberCRD42022287057.

show abstract

Vitamin D Status of Submariners during Patrol

Cited by 4 publications

References 1 publication

Fluctuating vector mesons in analytically continued functional RG flow equations

Fluctuating vector mesons in analytically continued functional RG flow equations

Hypercortisolism as a Potential Concern for Submariners

Vitamin D status in active duty Navy military personnel: a systematic review

Contact Info

Product

Resources

About