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Excessive stress and sleep deprivation can cause cardiovascular issues, such as high blood pressure and heart disease. In a study focusing on the impacts of chronic stress on the heart, it was found that during times of chronic stress, the body hyperactivates the sympathetic nervous system which leads to changes in heart rate variability. [22]
After going through stages of REM-sleep, people with depression report feeling better, in a study done by Cartwright et al. [40] Conversely, a theory proposed by Revonsuo [41] states that when people experience negative emotions or negative events, when they sleep the REM-sleep replays such events, which is known as rehearsal. [39] During REM ...
Heart rate variability, well known to increase during REM, predictably also correlates inversely with delta-wave oscillations over the ~90-minute cycle. [4] In order to determine in which stage of sleep the asleep subject is, electroencephalography is combined with other devices used for this differentiation.
Heart rate variability visualized with R-R interval changes Electrocardiogram (ECG) recording of a canine heart that illustrates beat-to-beat variability in R–R interval (top) and heart rate (bottom). Heart rate variability (HRV) is the physiological phenomenon of variation in the time interval between heartbeats. It is measured by the ...
Conversely, more sleep regularity was protective against heart attack and stroke. A new study found an increased risk of cardiovascular events in people with irregular sleep patterns, even when ...
One of the important questions in sleep research is clearly defining the sleep state. This problem arises because sleep was traditionally defined as a state of consciousness and not as a physiological state, [14] [15] thus there was no clear definition of what minimum set of events constitute sleep and distinguish it from other states of partial or no consciousness.
Poor sleep likely causes inflammatory and metabolic dysregulation that is associated with types of diabetes, heart disease, and high blood pressure, which are known risk factors for stroke, adds ...
Emotional eating, also known as stress eating and emotional overeating, [1] is defined as the "propensity to eat in response to positive and negative emotions". [2] While the term commonly refers to eating as a means of coping with negative emotions, it sometimes includes eating for positive emotions, such as overeating when celebrating an event or to enhance an already good mood.