The Chemical Messengers of Movement: How Neurotransmitters Shape Recovery and Performance
When you run, lift, balance, or reach for something, your body coordinates signals across the brain, spinal cord, nerves, and muscles. Neurotransmitters, chemical messengers that help nerve cells communicate, are part of that process. They also contribute to how you experience pain, alertness, mood, and sleep.
Understanding these roles can help make sense of why movement and recovery involve more than one muscle or joint. It does not mean that every ache or performance change is caused by a chemical imbalance. Neurotransmitter activity is complex, and this article is educational, not a way to diagnose your health or measure your neurotransmitter levels.
The infographic above introduces several of these messengers, including acetylcholine, dopamine, serotonin, GABA, glutamate, endorphins, and others. Here’s how to think about their relationship to movement and athletic performance.
Movement depends on coordinated signals
A movement begins with a plan and continues through a stream of information. Your brain and spinal cord send signals to muscles, while sensory nerves carry information back about position, pressure, and movement. The nervous system uses this ongoing exchange to shape what you do next.
At the connection between a motor nerve and a skeletal muscle, the neurotransmitter acetylcholine helps carry the signal that activates a muscle fiber. That is one established part of muscle activation. But producing a smooth, well-timed movement also involves many circuits in the brain and spinal cord, along with information from your senses and joints.
Other chemical messengers help regulate those circuits. Glutamate is a major excitatory neurotransmitter in the brain, while GABA and glycine provide important forms of inhibition. In simple terms, excitation helps cells become more active; inhibition helps limit or shape activity. Both are needed for coordinated control. Their effects depend on where they act and which receptors are involved.
The infographic is a starting point, not a complete map
The infographic groups neurotransmitters by familiar roles, such as movement, mood, pain, and alertness. Those labels are useful introductions, but they are not strict one-chemical, one-function rules. A messenger’s effects vary by brain region, receptor, and the networks involved.
For example, dopamine participates in motor control, motivation, learning, and reward. Norepinephrine is involved in attention and arousal, and it is also important in the body’s sympathetic nervous system. Serotonin has roles in several brain processes, including sleep–wake regulation and the modulation of pain. None of these can be reduced to a simple “performance chemical” or “mood chemical.”
The infographic also includes epinephrine, histamine, and adenosine. Epinephrine is best known for its role as a hormone in the body’s stress response, while histamine and adenosine have roles that include wakefulness and sleep regulation. These examples show why the nervous system is better understood as a network than as a list of isolated chemicals.
For an overview of neurotransmitter functions, see the NCBI Bookshelf’s introduction to neurotransmitters and its summary of major neurotransmitters.
Pain is real, but it is not a simple readout
Pain is an experience shaped by signals from the body and the nervous system’s processing of those signals. It can be influenced by tissue irritation or injury, but also by factors such as sleep, stress, prior experiences, and the wider context. This does not make pain imaginary. It means that pain is more complex than a direct measure of tissue damage.
Substance P is one messenger involved in transmitting pain-related signals. Endogenous opioid peptides, including endorphins, can also influence pain signaling through opioid receptors. These are established elements of pain physiology, but they do not let us predict exactly how a particular person will feel or recover.
In practice, a clinician may observe that pain changes alongside movement, activity, or other aspects of a person’s health. Such observations can help guide an assessment, but they are not the same as measuring neurotransmitter activity or proving a specific chemical cause. Persistent or changing pain deserves an individualized evaluation rather than assumptions based on an infographic.
Sleep, mood, and autonomic balance matter to training
Training takes place within the broader conditions of your day. Sleep, stress, energy, and mood can affect how ready you feel to move and how well you manage physical demands. The nervous system helps regulate sleep–wake patterns and autonomic functions such as heart rate and digestion. Neurotransmitters contribute to these processes, but they work alongside many other systems in the body.
This is one reason a useful rehabilitation plan considers the person as a whole. A change in performance may call for a closer look at training load, movement, recovery habits, injury history, and other relevant health factors. It should not be explained by a presumed neurotransmitter imbalance without appropriate evidence.
If sleep or mood concerns are persistent, consider discussing them with a qualified healthcare professional. Sports rehabilitation can support movement-related goals, but it is not a substitute for evaluation of broader health concerns.
What this means for rehabilitation and performance
In rehabilitation, the aim is not simply to make one muscle stronger or one joint move farther. Care may also involve how you coordinate movement, respond to load, and progress toward the activities that matter to you. Your plan should reflect your symptoms, goals, history, and clinical assessment.
For athletes and active people in Downtown San Diego, that could mean working toward a more comfortable return to running, improving balance for a sport, or rebuilding confidence after an injury. The right approach depends on your situation. There are no guaranteed timelines or outcomes, and an educational graphic cannot determine which care is appropriate for you.
Dr. Brian Garrett’s approach considers how muscles, joints, and the nervous system work together rather than treating symptoms in isolation. He is the founder and developer of Sports Kinesiology® and the developer of NeuroSync™, and is a board-certified chiropractor with 40 years in practice, about 38 of them in Downtown San Diego. His experience also includes board certification in pain management, disability analysis, and Federal Medical Examiner work. These credentials inform his perspective, but each person’s care still begins with their own needs and an appropriate evaluation.
A practical next step
The nervous system’s chemical messengers are part of the science behind movement, pain, and recovery. Their effects are interconnected, and they cannot be summed up by a single label or used to predict an individual outcome. What is useful is understanding that movement involves ongoing coordination between the brain, nerves, muscles, and joints.
If you are managing an injury or working toward a safe return to activity, you can learn more about Sports Kinesiology® or find a practitioner. A conversation can help you understand whether an assessment or a different type of care is appropriate for your goals.