Movement is Medicine: physical exercise as a regulator of metabolism and the immune system

Physical exercise, when framed appropriately for the individual context, is recognised as a relevant physiological stimulus with an impact on multiple systems in the body. Scientific research has explored the relationship between movement, metabolism and the immune system, suggesting that regular physical activity can influence adaptive processes associated with homeostasis, inflammation and energy utilisation.

This influence is neither uniform nor absolutely predictable. The effects of exercise depend on variables such as intensity, duration, frequency, state of health, recovery capacity and the clinical context of each person. Even so, movement is an important factor in the interaction between the metabolic, neuroendocrine and immune systems.

The human body and adaptation to movement

The human organism developed in an evolutionary context characterised by the need for regular movement. Musculoskeletal structures, metabolic pathways and cell signalling mechanisms respond to mechanical and energetic stimuli. In observational studies, a prolonged reduction in physical activity is associated with metabolic and inflammatory changes, but these relationships should not be interpreted as deterministic.

The World Health Organisation's recommendations, which suggest at least 150 minutes of moderate physical activity per week, reflect this physiological understanding. These guidelines aim to support the maintenance of cardiovascular, metabolic and musculoskeletal function, and are not related to aesthetic or performance goals.

Integrative physical exercise considers movement as a systemic stimulus, the application of which must respect individual variability, functional status and clinical context.

Movement and circulation of body fluids

During physical activity, muscle contraction, increased cardiac output and respiratory modulation favour blood and lymph circulation. The lymphatic system, whose dynamics depend to a large extent on movement, can benefit from this mechanical stimulus. In parallel, the renal, respiratory and skin systems participate in the management of metabolic by-products.

These processes are part of the normal physiological mechanisms for adapting to exertion, contributing to internal balance, without involving specific or guaranteed toxin elimination processes.

Endothelial function and cardiovascular adaptation

Several studies have shown that regular physical activity is associated with improvements in endothelial function, including changes in the bioavailability of nitric oxide, a molecule involved in regulating vascular tone. These adaptations can contribute to better tissue perfusion and blood pressure regulation, depending on the individual profile and the type of exercise performed.

The transient increase in cerebral blood flow observed during physical activity has been associated with positive effects on cognitive and emotional functions, although these results vary between individuals and contexts.

Metabolic flexibility and mitochondrial function

Metabolic flexibility, understood as the body's ability to adjust the utilisation of different energy substrates, is considered a relevant marker of metabolic health. Physical exercise stimulates mitochondrial adaptations, influencing energy efficiency and cell signalling.

Scientific literature has associated changes in mitochondrial function with inflammatory and metabolic processes, suggesting that movement can play a modulating role, without this implying uniform or universal effects.

Physical exercise and glycaemic regulation

Muscle contraction increases glucose uptake by muscle cells through mechanisms that are partially independent of insulin. This phenomenon gives exercise an important role in modulating postprandial glycaemia, particularly in individuals with altered insulin sensitivity.

Movement after meals has been studied as a complementary strategy in metabolic management and should be part of an overall clinical assessment.

Exercise and the immune response

The immune system and energy metabolism are interconnected. Physical exercise influences the release of myokines and other mediators with regulatory effects on inflammation. In inflammatory or autoimmune contexts, these effects depend heavily on the dose, intensity and appropriateness of the stimulus.

Physical activity can contribute to modulating the immune response, provided it is adapted to individual capacities and needs, and it is recognised that excessive stimuli can produce adverse effects in certain clinical contexts.

Movement, pain and neurophysiological regulation

During physical exercise, neurochemical mediators associated with the modulation of pain and stress. In addition to the transient effect, movement can influence factors related to the pain experience, such as inflammation, muscle tension, sleep quality and emotional regulation.

This perspective frames exercise as a potentially relevant element in the clinical approach to pain, as part of a broader, more individualised strategy.

Understanding physical exercise from an integrative clinical perspective

Physical exercise can be understood as a biological stimulus with a transversal impact on the metabolic, cardiovascular, immune and neuroendocrine systems. It is an essential biological response, capable of rebalancing systems, optimising energy and modulating inflammation. Its clinical application requires careful assessment, progressive adaptation and fitting into the person's overall health context. Integrative physical exercise is much more than a healthy habit.

Clinical Psychoneuroimmunology is a science that makes it possible to analyse the interactions between the nervous, endocrine and immune systems, supporting a clinical assessment that integrates movement as a relevant variable in physiological regulation.

A consultation with a specialist in Clinical Psychoneuroimmunology allows physical exercise to be framed in an individualised way, taking into account the metabolic, immune and functional context of each person.