Portuguese 
Spanish 
Research conducted with healthy volunteers shows that psychological stress triggers chemical changes in a few minutes, modifies the formation of blood clots, and reinforces the link between mental health and cardiovascular health.
Stress is often treated merely as an emotional reaction. However, new scientific evidence shows that its effects go far beyond the mind. A study conducted by researchers at the University of Birmingham revealed that just a few minutes of acute psychological stress are enough to cause measurable changes in the blood, increasing the production of highly reactive molecules and altering the way blood clots form.
The information was disclosed by the portal The Conversation, in an article signed by researcher Lewis Fall. The text presents the results of a scientific study conducted by researchers at the University of Birmingham, which investigated how acute psychological stress influences oxidative stress and the formation of blood clots in healthy volunteers.
Although previous research had already linked chronic stress to an increased incidence of cardiovascular diseases, the biological mechanisms involved still generated debates. Now, the new work helps explain how an emotional response can trigger almost immediate physical changes.
-
Ukraine Escalates War Efforts with Plan to Deploy 25,000 Ground Drones, Test Phantom MK-1 Humanoid Robot, Use Armed Mini-Tanks, and Expand Automated Attacks up to 15 km from Frontline
-
New Superfiber Developed by Imperial College Researchers and Approved by the EU Promises to Increase Satiety and Help Prevent Weight Gain
-
Harvard Researchers Develop Biological Clock to Estimate Life Expectancy, Potentially Transforming Human Aging Studies
-
Methane, natural fuel lakes, ice, and a nitrogen-rich atmosphere make Titan central to NASA’s plans for the first “space fuel station” to speed up missions beyond Mars.
Research identified changes in the blood a few minutes after a stress situation
To understand this process, the scientists conducted a cross-over, randomized, and controlled study with eight healthy men, aged between 18 and 30 years.
Each participant attended the laboratory on two occasions, with a one-week interval between visits.
In the first session, the volunteers remained seated at rest. In the second, they faced the Trier Social Stress Test, considered an international reference for inducing acute psychological stress in a controlled environment.
The protocol simulated common everyday situations that cause anxiety. Initially, each participant was given five minutes to prepare a speech. Then, they had to present the speech in front of a camera and a panel of evaluators with neutral expressions. Shortly before the start of the presentation, the researchers collected all notes.
Soon after, the volunteers undertook a mental calculation challenge. They needed to count backward from 2003, decreasing by 17 with each response. Whenever they made a mistake, they restarted the exercise from the beginning.
Before and after the two sessions, the team collected blood samples to compare the changes caused by stress.
Additionally, the researchers used a highly sensitive technique called electron paramagnetic resonance spectroscopy, capable of identifying the production of free radicals in the body. At the same time, the team analyzed the microscopic structure of blood clots during their formation.
Stress increased free radicals and modified the structure of clots
The results showed clear differences between the two situations evaluated.
During the rest period, the chemical composition of the blood remained stable. However, after the stress test, the researchers observed a significant increase in free radicals, especially the ascorbate radical, used as a marker of oxidative stress.
At the same time, the architecture of the blood clots underwent significant changes. The clots became larger, denser, and showed a higher concentration of fibrin, a protein responsible for providing structural support during the coagulation process.
Additionally, the team identified signs of activation of the so-called intrinsic pathway of the coagulation system, a mechanism that participates in the formation of clots under certain physiological conditions.
On the other hand, the scientists did not find changes in blood viscosity. This result contradicts one of the most discussed hypotheses so far, which suggested that stress would increase cardiovascular risk by making the blood more concentrated, a phenomenon known as hemoconcentration.
Discovery broadens understanding of the effects of stress on health
The researchers argue that the main trigger for these changes may be oxidative stress, characterized by the rapid production of free radicals during situations of emotional pressure.
According to this interpretation, free radicals directly modify the structure of clots, making the blood more prone to coagulation even after short periods of stress.
This discovery strengthens the understanding of the link between mental health and cardiovascular health. Furthermore, it could guide new research on heart disease prevention and the development of strategies to reduce the biological impacts of stress.
Although the study involved only eight participants, the authors explain that laboratory research of this type prioritizes the detailed investigation of biological mechanisms and requires highly controlled protocols.
Therefore, the results do not aim to estimate population risk but to clarify how the body reacts at a molecular level in situations of psychological stress.
In this way, the research adds new evidence that intense emotions are not confined to the brain. In a matter of minutes, they trigger chemical responses capable of altering the functioning of the circulatory system and influencing processes fundamental to human health.
Have you noticed how periods of high stress affect your body, your disposition, or even your health? Share your experience in the comments.
