Human cardiovascular system

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Cardiovascular Health
The Pathobiological Determinants of Atherosclerosis in Youth PDAY study demonstrated that intimal lesions appear in all the aortas and more than half of the right coronary arteries of youths aged 7—9 years. Normally, older men are apt to have lower testosterone levels than younger men. These effects may, at least in part, explain its cardiovascular benefits. Specifically the risk of stroke was also increased by exposure to ionizing radiation. Increases during chronic inflammation c. A diet low in refined carbohydrate and that limits high glycemic index foods may reduce inflammation in which of the following ways?

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How to Maintain a Healthy Cardiovascular System

While decreasing vagal tone increases the heart rate somewhat, very fast pulses require additional neural stimulation. In her book "Human Physiology," Dr. Lauralee Sherwood explains that stress and exercise activate the sympathetic nervous system, which prepares the body to fight or flee from attack.

One of the effects of the sympathetic nerves innervating the heart is that they increase its rate of beating. Another effect is that the sympathetic nervous system makes the heart beat harder, forcing out a larger volume of blood with each beat, and forcing blood out with greater strength.

These factors combine to produce increased blood flow to hard-working body tissues. In addition to direct neural innervation of the heart, the nervous system can also affect the cardiovascular system through releasing chemical messengers, or neurotransmitters, into the bloodstream.

One important neurotransmitter is epinephrine, sometimes called adrenaline. Thibodeau notes that this compound is released by nerves in a gland that sits on top of each kidney, and when released, travels through the bloodstream to target organs. One such target is the heart; when the neural product epinephrine reaches the heart, it increases pulse rate and contractility, increasing cardiac output and increasing the amount of blood that reaches the body tissues.

Video of the Day. What Are the Organs of the Cardiovascular System? Chemoreceptors in the Cardiovascular System. Natural Ways to Increase Blood Circulation. Cardiovascular Disease Several studies have found an association between the consumption of anthocyanin-rich foods and CVD protection. The researchers found that consuming anthocyanin-rich strawberries and blueberries once per week was associated with a significant reduction in death from CVD and coronary artery disease.

The decreased risk of CVD may be due, in part, to a reduction in arterial stiffness and blood pressure. As part of the Twins UK study of 1, women aged 18 to 75, researchers found that a higher intake of anthocyanins was associated with significantly lower central systolic blood pressure and arterial pressure.

The authors suggested that consuming one to two portions of berries per day might be an important strategy for lowering CVD risk. A study of rats fed a red cabbage extract rich in anthocyanins recently provided the first piece of evidence that an anthocyanin extract protected against hypercholesterolemia induced by an atherogenic diet and related cardiac oxidative stress.

Laboratory studies suggest that anthocyanins and their metabolites, which are produced by gut microflora, may decrease inflammatory markers associated with increased CVD risk. Cancer Anthocyanins and anthocyanin-rich extracts in cell culture and in animals have anticarcinogenic activities. While laboratory studies have provided some insight into how they may work, the exact mechanism or mechanisms for how these dietary compounds prevent cancer is unclear. Laboratory studies that used a variety of cancer cells have indicated that anthocyanins not only act as antioxidants, they also activate detoxifying enzymes; prevent cancer cell proliferation; induce cancer cell death apoptosis ; have anti-inflammatory effects; have antiangiogenesis effects ie, they inhibit the formation of new blood vessels that encourage tumor growth ; prevent cancer cell invasion; and induce differentiation the more differentiated the cancer cell, the less likely it is to grow and spread.

In animal studies, anthocyanins inhibit cancer development in animals given carcinogens and in those with a hereditary predisposition to cancer. In cell culture, anthocyanins from an anthocyanin-enriched purple sweet potato stopped the reproduction of colon cancer cells and initiated cancer cell death. Two studies from Italy found no relationship between anthocyanin intake and the risk of oral, pharyngeal, or prostate cancer.

Cognitive Function With regard to cognitive function, research suggests that flavonoids, including anthocyanins, have the ability to enhance memory and help prevent age-related declines in mental functioning. Several other studies have found that berries, most notably blueberries, which are rich in anthocyanins, can effectively reverse age-related deficits in certain aspects of working memory.

Anthocyanins and other flavonoids are thought to work by inhibiting neuroinflammation, activating synaptic signaling, and improving blood flow to the brain. The authors of a recent review on the subject suggested that the consumption of flavonoid-rich fruits such as berries, apples, and citrus throughout life potentially could limit or even reverse age-dependent deteriorations in memory and cognition.

As of now, however, there are no human studies to prove a causal relationship between the consumption of anthocyanins, or any flavonoid, and cognitive functioning. Whether the consumption of flavonoid-rich foods can have a beneficial effect on cognition also may depend on when in life exposure occurs. For anthocyanin-rich berries, she recommends keeping frozen ones on hand. While Blumberg admits that the medical community has limited knowledge of the mechanisms of action and health benefits of anthocyanins, he questions the wisdom of waiting for definitive research when clients may benefit from increased consumption of anthocyanin-rich foods now.

Anthocyanins in cardiovascular disease. Mol Nutr Food Res. Concentrations of anthocyanins in common foods in the United States and estimation of normal consumption. J Agric Food Chem. Flavonoid intake and cardiovascular disease mortality: Am J Clin Nutr. Prospective study of alcohol consumption and risk of coronary disease in men.

Habitual intake of flavonoid subclasses and incident hypertension in adults. High anthocyanin intake is associated with a reduced risk of myocardial infarction in young and middle-aged women.

Higher anthocyanin intake is associated with lower arterial stiffness and central blood pressure in women. Effects of wine, alcohol and polyphenols on cardiovascular disease risk factors: A randomised trial to investigate the effects of acute consumption of a blackcurrant juice drink on markers of vascular reactivity and bioavailability of anthocyanins in human subjects.

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