Abstract
The present study investigates the impact of seafood intake on biological markers in blood such as the marine very long-chain polyunsaturated omega-3 fatty acids eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), 25-hydroxyvitamin D (25(OH)D), in addition to heart rate variability (HRV), which is an important biological marker of good health, both physical and mental. A total of 53 male inmates from a Norwegian prison were randomly assigned to intervention and control groups, although attrition reduced some comparisons at the end of the study to 13 (intervention group (n = 6) and control group (n = 7). The intervention group received seafood (mainly fatty fish, > 8% fat) for dinner three times per week for a period of 6 months. Both groups were requested to eat their usual diet provided by the prison. Blood samples were collected and HRV (high frequency (HF) and low frequency (LF) power) was measured before and after the study period. Overall, the intervention group showed significant increase in levels of 25(OH)D and HF-power, and a significant reduction in the sympathovagal balance (LF/HF). The present findings may have important implications with regard to health improvement.
References
2007). A comprehensive assessment of fish and other seafood in the Norwegian diet. Report from Norwegian Scientific Committee for Food Safety. Retrieved from www.vkm.no/eway/default.aspx?pid=0&oid=-2&trg=__new&__new=-2:17473
(2006). Heart rate variability as an index of regulated emotional responding. Review of General Psychology, 10, 229–240.
(2008). Evaluation of a rapid method for the quantitative analysis of fatty acids in various matrices. Journal of Chromatography A, 1212, 106–113.
(1994). Monoamine neurotransmitters in human aggressiveness and violence: A selective review. Criminal Behavior and Mental Health, 4, 303–327.
(2004). The influence of major depression and its treatment on heart rate variability and pupillary light reflex parameters. Journal of Affective Disorders, 82, 245–252.
(2006). Tryptophan depletion affects heart rate variability and impulsivity in remitted depressed patients with a history of suicidal ideation. Biological Psychiatry, 60, 507–514.
(1999). Heart rate variability and fatty acid content of blood cell membranes: A dose-response study with n-3 fatty acids. American Journal of Nutrition, 70, 331–337.
(2001). Marine n-3 fatty acids, wine intake, and heart rate variability in patients referred for coronary angiography. Circulation, 651–657.
(2001). Heart rate variability and n-3 polyunsaturated fatty acids in patients with diabetes mellitus. Journal of Internal Medicine, 249, 545–552.
(1992). A power primer. Psychological Bulletin, 112, 155–159.
(1997). Sympathovagal balance. Circulation, 96, 3224–3232.
(2003). Enhanced incorporation of n-3 fatty acids from fish compared with fish oils. Lipids, 41, 1109–1114.
(1993). Heart rate variability in anxiety disorder. Psychophysiology, 30, 28.
(2003). Effect of n-3 fatty acids on heart rate variability and baroreflex sensitivity in middle-aged subjects. American Heart Journal, 146, 344.
(2002). Influence of supplementary vitamins, minerals and essential fatty acids on the antisocial behavior of young adult prisoners. British Journal of Psychiatry, 181, 22–28.
(2008). 25-hydroxyvitamin D and risk of myocardial infarction in men. Archives of Internal Medicine, 168, 1174–1180.
(2004). Heart rate variability and its relation to prefrontal cognitive function: The effects of training and detraining. European Journal Applied Physiology, 93, 263–272.
(2003). Vagal influence on working memory and attention. International Journal of Psychophysiology, 48, 263–274.
(2007). Facets of psychopathy and heart rate variability and cognitive functions. Journal of Personality Disorders, 21, 568–582.
(2006). Omega-3 fatty acid deficiencies in neurodevelopment, aggression, and autonomic dysregulation: Opportunities for intervention. International Review of Psychiatry, 18, 107–118.
(2005). Central 5-HT7 receptors are critical for reflex activation of cardiac vagal drive in anaesthetized rats. Journal of Physiology, 563, 319–331.
(1994). Ambulatory monitoring system. In , Computers in psychology 5, applications, methods and instrumentation (pp. 254–268). Lisse, The Netherlands: Swets & Zeitlinger.
(1996). Heart rate variability. Standards of measurement, physiological interpretation, and clinical use. Circulation, 93, 1043–1065.
. (1991). Cardiovascular neural regulation explored in the frequency domain. Circualtion, 84, 48–492.
(2008). Is there convincing biological or behavioral evidence linking vitamin D deficiency to brain dysfunction. The FASEB Journal, 22, 982–1001.
(2007). Supine low-frequency power of heart rate variability reflects baroreflex function, not cardiac sympathetic innervation. Heart Rhythm, 4, 1523–1529.
(1985). Assessment of autonomic function in humans by heart rate spectral analysis. American Journal of Physiology, 17, H151–153.
(2007). Is vitamin D important for preserving cognition? A positive correlation of serum 25-hydroxyvitamin D concentration with cognitive function. Archives of Biochemistry and Biophysics, 460, 202–205.
(2002). Functional assessment of heart rate variability: Physiological basis and practical applications. International Journal of Cardiology, 84, 1–14.
(2007). Omega-3 fatty acids as treatments for mental illness: Which disorder and which fatty acid? Lipids in Health and Disease, 6, 1–19.
(1989). Light, vitamin D and psychiatry: Role of 1,25-dihydroxyvitamin D3 (soltriol) in etiology and therapy of seasonal affective disorder and other mental processes. Psychopharmacology, 97, 285–294.
(2009). Heart rate variability, prefrontal neural function, and cognitive performance: The neurovisceral integration perspective on self-regulation, adaptation, and health. Annals of Behavioral Medicine, 37, 141–153.
(2000). A model of neurovisceral integration in emotion regulation and dysregulation. Journal of Affective Disorders, 61, 201–216.
(2007). The role of vagal function in the risk for cardiovascular disease and mortality. Biological Psychology, 74, 224–242.
(2009). Claude Bernard and the heart-brain connection: Further elaboration of a model of Neurovisceral Integration. Neuroscience and Biobehavioral Reviews, 33, 81–88.
(2009). Effects of dietary intervention on MRI activity, de-and remyelination in the cuprizone modell of demyelination. Experimental Neurology, 215, 160–166.
(2006). Vitamin D deficiency is associated with low mood and worse cognitive performance in older adults. American Journal of Geriatric Psychiatry, 14, 1032–1040.
(2003). Vitamin D in preventive medicine: Are we ignoring the evidence? The British Journal of Nutrition, 89, 552–572.
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