This response is part of the inflammatory reflex and it is the body’s main defense against infections. When the defense system encounters these antigens it mounts a similar immune response as if it were exposed to the real virus itself. Most vaccines work by exposing the body’s defense system to particles that look like parts of a virus (called antigens). The effect is short lived and usually resolves within days. Interestingly, this reduction was only detected in those who reported symptoms after receiving the vaccine. A study on 72 volunteers who received a routine influenza vaccine showed a significant reduction in HRV in some of them. It has been reported in the past that taking a vaccine can indeed have a lowering effect on HRV. However, WHOOP has recently reported that they detected a lower HRV in 1 out of 5 people after receiving the COVID-19 vaccine. Most people will not see a meaningful change in HRV after receiving a vaccine. Does taking a vaccine affect HRV? The short answer is: in some people it can. Anything that causes an imbalance between these two branches' effects on the heart can potentially lead to a low HRV. This has been linked to an increased risk of death and heart disease. A low HRV indicates overactivation of the fight-or-flight mode. HRV reflects the balance between these two branches. It has two branches: the parasympathetic branch which is activated during relaxation and the sympathetic branch which is activated during periods of stress (also called the fight-or-flight mode). The ANS is the part of our nervous system that controls the involuntary functions of the body. This variation arises from the effect of the autonomic nervous system (ANS) on the heart. Heart rate variability (HRV) is the measure of variation in time between heart beats.
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