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Kavalactones are a class of lactone compounds found in kava roots and Alpinia zerumbet (shell ginger). [1] and in several Gymnopilus, Phellinus and Inonotus fungi. [2] Some kavalactones are bioactive. They are responsible for the psychoactive, analgesic, euphoric and sedative effects of kava. [3] [4]
Kava prepared as described above is much more potent than processed kava. Chewing produces the strongest effect because it produces the finest particles. Fresh, undried kava produces a stronger beverage than dry kava. The strength also depends on the species and techniques of cultivation.
Chronotropic effects (from chrono-, meaning time, and tropos, "a turn") are those that change the heart rate.. Chronotropic drugs may change the heart rate and rhythm by affecting the electrical conduction system of the heart and the nerves that influence it, such as by changing the rhythm produced by the sinoatrial node.
The resting heart rate of a newborn can be 120 beats per minute (bpm) and this gradually decreases until maturity and then gradually increases again with age. The adult resting heart rate ranges from 60 to 100 bpm. Exercise and fitness levels, age and basal metabolic rate can all affect the heart rate. An athlete's heart rate can be lower than ...
Cardiovascular physiology is the study of the cardiovascular system, specifically addressing the physiology of the heart ("cardio") and blood vessels ("vascular").. These subjects are sometimes addressed separately, under the names cardiac physiology and circulatory physiology.
It is the hallmark bulging-out of the apex of the heart with preserved function of the base that earned the syndrome the name takotsubo ("octopus trap") in Japan, where it was first described. [ 14 ] Stress is the main factor in takotsubo cardiomyopathy, with more than 85% of cases set in motion by either a physically or emotionally stressful ...
Several agents called "heart rate reducing agents" act by specifically inhibiting f-channel function. [3] Ivabradine is the most specific and selective I f inhibitor and the only member of this family that is now marketed for pharmacological treatment of chronic stable angina in patients with normal sinus rhythm who have a contraindication or ...
The Bainbridge reflex is most strong when heart rate is low; when heart rate is already high, additional venous return to the right atrium (i.e. additional increases in blood volume) will indirectly cause relatively greater stimulation of arterial baroreceptors which will reduce the heart rate. Thus, the effect of the Bainbridge reflex on heart ...