Franz Bernhard Nolte
2026/10/27
franz.nolte12@gmail.com
The heart is part of an interconnected regulatory system; it does not function in isolation. It is functionally linked to the brain, the autonomic nervous system, the endocrine system, the lungs, the blood vessels, the musculature, and the metabolic system.
Physical, mental, and emotional stress activate, in part, the same biological regulatory systems.
These include, in particular:
the sympathetic nervous system;
the adrenal medulla, with its release of adrenaline and noradrenaline;
the hypothalamic-pituitary-adrenal (HPA) axis, with its release of cortisol;
the cardiovascular system, which ensures blood flow according to physiological demand;
respiration and the regulation of oxygen transport;
energy metabolism, which provides glucose and fatty acids.
“Significant stress” alters not only the energy requirements of individual organs but also the hormonal, neural, and hemodynamic regulation of the entire organism.
Consequently, “significant stress”—originating in the brain, the psyche, or the striated, consciously controlled skeletal muscles—can, under certain circumstances, affect the heart muscle (via beta-receptors), which is also striated but functions involuntarily.
This is not a fringe hypothesis; rather, it aligns with fundamental insights from stress physiology and cardiovascular medicine.
What provides the hormones, the oxygen, and the energy? (System/Scientifically established function)
Sympathetic nervous system
Activates the heart, blood vessels, and metabolism; releases primarily noradrenaline at nerve endings
Adrenal medulla
Secretes adrenaline and noradrenaline into the bloodstream
Adrenal cortex
Produces cortisol, regulated by the hypothalamus and pituitary gland
Heart
Pumps blood, enabling the transport of oxygen and energy (e.g., derived from nutrients)
Lungs
Absorb oxygen and release carbon dioxide
Liver
Provides substances such as glucose
Adipose tissue
Mobilizes fatty acids as energy sources
Mitochondria
Generate ATP within cells, serving as immediately usable energy
The heart facilitates the distribution of oxygen and energy throughout the body via the circulatory system. Oxygen is obtained from the air we breathe, while energy sources come from food and the body’s own internal stores.
Cortisol is not released solely in response to intense brain activity. It is a hormone involved in general stress adaptation, influencing processes such as glucose metabolism, vascular responses, immune function, and long-term energy supply.
The brain also has a high energy demand. At rest, it consumes approximately 20% of the body’s total oxygen, despite accounting for only about 2% of total body weight.
During intense mental activity, the brain’s overall oxygen consumption increases. This is often accompanied by shifts in regional activity and blood flow.
Under significant physical exertion, skeletal muscle can increase its oxygen consumption many times over.
The heart muscle itself utilizes a variety of substrates, including fatty acids, glucose, and lactate.
The oxygen supply to the heart muscle depends critically on blood flow through the coronary arteries. The simultaneous increase in heart rate, contractility, and arterial blood pressure during intense physical, mental, or emotional stress significantly elevates the mechanical and metabolic demands placed on the heart muscle.
Under certain conditions, this can create a mismatch between myocardial oxygen demand and coronary oxygen supply.
In the event of a pronounced stress response—combined with individual vulnerability—other complications may arise, such as coronary vasomotor dysfunction, cardiac arrhythmias, or myocardial damage mediated by catecholamines.
Such damage may be associated with an elevation in cardiac troponin levels. However, a sympathetic stress response does not necessarily lead to myocardial injury or the release of troponin.
Intense mental and emotional stress can significantly influence cardiac activity through the activation of the sympathetic nervous system and the sympathoadrenal system.
The resulting release of catecholamines—specifically adrenaline and noradrenaline—can exert positive chronotropic, inotropic, and dromotropic effects on the heart. This can lead to an increase in heart rate, myocardial contractility, stroke volume, cardiac output, and arterial blood pressure.
In particular, intense cognitive demands coupled with strong emotions—such as fear, grief, anger, despair, or aggression—can trigger pronounced neurovegetative and hemodynamic stress responses.
The resulting increase in myocardial oxygen demand can contribute to a mismatch between coronary oxygen supply and myocardial oxygen demand, potentially promoting myocardial ischemia or injury.
Central stress processing
Cardiovascular and metabolic responses are triggered via the brain, the hypothalamus, and the autonomic nervous system—involving the sympathetic nervous system, the adrenal medulla, norepinephrine and epinephrine, and the hormonal stress axis (ACTH and cortisol).
Heart rate, contractile force, blood pressure, vascular tone, and energy availability are altered.
Potential stressors on the heart muscle:
Increased oxygen demand, changes in coronary blood flow, and mechanical and cellular strain.
Psychological and intellectual strain on the heart muscle occurs during intense emotional stress—often associated with time pressure, anxiety, conflict, aggression, or sleep deprivation.
Myocardial injury with troponin release
Severe emotional stress can, via the brain, trigger the same sympathetic cardiovascular responses that occur during physical exertion.
Intense mental strain can also lead to sympathetic activation, especially when accompanied by time pressure, anxiety, conflict, or sleep deprivation.
Mental work alone does not necessarily impose significant strain on the heart muscle, unless it is heavily influenced by intense emotions.
How does this lead to an elevation in troponin levels?
Troponin is a component of the contractile apparatus within muscle cells. Cardiac troponins I and T—which are measured in clinical cardiology—serve as key markers of heart muscle injury. An elevated level of cardiac troponin in the blood indicates damage to heart muscle cells. However, this alone does not confirm a heart attack.
A heart attack is only diagnosed when there is additional evidence of acute myocardial ischemia—such as typical symptoms, characteristic ECG changes, or relevant findings from imaging studies.
Regarding my hypothesis that troponin is released under physical, as well as mental and emotional, stress, four mechanisms are particularly relevant.
First: Increased oxygen demand of the heart muscle. Adrenaline and noradrenaline can raise heart rate, contractile force, and blood pressure, thereby increasing the heart muscle’s demand for oxygen.
Second: Reduced oxygen supply.
In cases of anemia, oxygen deficiency, low blood pressure, circulatory disturbances, or specific alterations in the coronary arteries, the oxygen supply may become insufficient. Pronounced tachycardia can also impair coronary perfusion.
Third: Direct cellular stress mechanisms.
Intense adrenergic activation, disruptions in calcium homeostasis, oxidative stress, and mechanical strain can, under certain circumstances, damage heart muscle cells. These mechanisms have been studied, for instance, in the context of stress-induced cardiomyopathy.
Fourth: Other causes of heart muscle damage.
Inflammation of the heart muscle, heart failure, rhythm disorders, pulmonary embolisms, severe systemic illnesses, and other processes can also lead to elevated troponin levels.
Troponin is neither a repair hormone nor an inflammatory mediator. It is not released in a targeted manner to regulate an imbalance between energy supply and energy demand. Its presence in the blood is, rather, an indication of an alteration or injury to heart muscle cells. While inflammatory mediators may be involved in certain disease processes, they are not necessarily the cause or consequence of every instance of elevated troponin levels.
What happens within the individual organs?
The response to physical stress does not affect all organs in the same way.
Organ Response to intense stress Potential consequences of overload
Brain
Changes in neuronal activity, stress processing, autonomic regulation; difficulties with concentration, sleep disturbances, exhaustion
Heart
Increased heart rate and contractile force, higher oxygen demand; rhythm disturbances, ischemia, myocardial injury
Lungs
Increased respiratory rate and ventilation; shortness of breath; drop in CO₂ levels (in cases of hyperventilation)
Blood vessels
Redistribution of blood flow, changes in vascular resistance, rise in blood pressure; potential circulatory impairment
Liver
Release and synthesis of glucose; transiently elevated blood sugar
Adipose tissue
Release of fatty acids; increased supply of energy substrates
Skeletal muscle
Increased blood flow, oxygen uptake, and ATP turnover; exhaustion; muscle damage (in cases of extreme exertion)
Kidneys
Adjustment of blood flow, as well as salt and water balance. Functional impairment may occur under severe circulatory stress.
These organ responses are initially normal adaptive processes, not diseases.
It is only when the stress exceeds an individual’s capacity to adapt—or when an underlying medical condition is present—that these responses can develop into pathological processes.
While these forms of stress are related, they are not identical. Scientifically, this analogy can be defined more precisely as follows:
Physical exertion primarily creates an increased demand for metabolism and oxygen within the working muscles.
Mental strain engages neuronal networks and, particularly under pressure to perform, can activate the autonomic nervous system.
Emotional stress—arising from the processing of fear, loss, threats, or conflict—can trigger pronounced autonomic and hormonal stress responses.
All forms of stress can influence cardiovascular regulation.
However, they do not necessarily result in the same level of oxygen consumption or the same consequences. Their common physiological link lies less in identical energy expenditure and more in the central nervous, autonomic, and hormonal regulation of the cardiovascular system.
What does this mean in the context of elevated troponin levels?
In the field of cardiology, an international distinction is made between three conditions:
Acute myocardial injury
Troponin levels rise and/or fall.
Type 2 myocardial infarction
Documented acute ischemia occurs due to a mismatch between oxygen supply and oxygen demand, in the absence of acute coronary atherothrombosis.
Type 1 myocardial infarction
Typically, this involves plaque rupture or erosion, accompanied by thrombus formation in a coronary artery, leading to an acute disruption of blood flow.
This classification is incorporated into the guidelines of the European Society of Cardiology. The concept of an imbalance between supply and demand is, therefore, not medically implausible. Not every stress-related elevation in troponin levels should automatically be classified as a type 2 myocardial infarction.
Following intense, sustained exertion—whether physical, mental, or psychological—transient increases in troponin levels are observed in some individuals.
The mechanisms behind this release are not yet fully understood. Such an elevation does not necessarily imply irreversible destruction of heart muscle cells.
Neurocardiovascular stress responses as a potential cause of dynamic troponin elevation
Physical, cognitive, and emotional stressors place different demands on the human organism; however, they are interconnected through shared neurovegetative, neuroendocrine, hemodynamic, and metabolic regulatory mechanisms.
The sympathetic nervous system, the sympathoadrenal system, and the hypothalamic-pituitary-adrenal (HPA) axis play central roles in this process.
Stress-induced activation of these systems can lead to an increased release of catecholamines and cortisol, resulting in changes to heart rate, myocardial contractility, arterial blood pressure, vascular tone, and energy metabolism.
Consequently, both physical and psychological stress affect not only the specific organ systems under strain but also, indirectly, the hemodynamic and metabolic demands placed on the heart muscle.
Under certain conditions, this can create an imbalance between myocardial oxygen demand and coronary oxygen supply.
Furthermore, non-ischemic mechanisms of heart muscle cell injury may also be involved—for example, pronounced catecholaminergic activation, mechanical stress on the cells, or disruptions in intracellular calcium homeostasis. A dynamic rise in cardiac troponin levels can be an indication of such acute myocardial injury.
The detection of an increase or decrease in troponin levels does not, in itself, provide a definitive explanation for the underlying cause.
In particular, it is necessary to distinguish between acute non-ischemic myocardial injury, type 2 myocardial infarction (involving documented myocardial ischemia resulting from an imbalance between oxygen supply and demand), and type 1 myocardial infarction (caused by acute coronary atherothrombosis).
Against this background, it is physiologically plausible—in cases of unexplained dynamic troponin elevations—to include significant cognitive and emotional stress, along with their associated autonomic, hormonal, and hemodynamic effects, in the differential diagnosis, alongside structural and coronary causes.
It should not be assumed, however, that every instance of intense mental or emotional strain immediately triggers the release of troponin.
Rather, the question arises as to whether, given a specific individual vulnerability and a sufficiently pronounced stress response, significant myocardial strain or injury might be triggered or exacerbated.
The central clinical question is therefore:
Can a documented dynamic rise in troponin levels in a specific case be explained by acute myocardial injury mediated by neurovegetative and hemodynamic factors associated with physical or mental stress? Furthermore, what findings support or argue against an underlying ischemic or non-ischemic mechanism?
Such a hypothesis should be evaluated by examining the temporal pattern of troponin levels, the history of stress or exertion, vital signs, ECG, echocardiography, potentially cardiac magnetic resonance imaging (MRI), and—where individually indicated—coronary diagnostic procedures.
A psychosomatic approach to explaining otherwise unexplained troponin elevations
This perspective is not intended as an alternative to established cardiological diagnostics; rather, it serves as an integrative, psychosomatic pathophysiological framework within the recognized differential diagnosis of acute myocardial injury.
Scientific Foundations
• Thygesen K. et al. (2018): Fourth Universal Definition of Myocardial Infarction. European Heart Journal.
• Byrne R. A. et al. (2023): 2023 ESC Guidelines for the Management of Acute Coronary Syndromes. European Heart Journal.
