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 Laser Mechanisms of Action 

1. Enhancement of ATP production and synthesis 

    * ATP production and synthesis are significantly enhanced, contributing to cellular repair, reproduction and           functional ability 

    * Photonic stimulation of Cytochrome c Oxidase, a chromophore found on the mitochondria of cells, plays a         major role in this rapid increase in production and synthesis of ATP.

2. Stabilization of the cellular membrane 

    * Ca++, Na+ and K+ concentrations, as well as the proton gradient over the mitochondria membrane are                   positively influenced. 

    * This is accomplished in part, by the production of beneficial Reactive Oxygen Species aka (ROS). 

    * These ROS’s modulate intracellular Ca++ concentrations and laser therapy improves Ca++ uptake in the               mitochondria.

3. Stimulation of vasodilation 

     * Vasodilation is stimulated via an increase in Histamine, Nitric Oxide (NO) and Serotonin levels, resulting in            reduction of ischemia and improved perfusion 

     * Laser-mediated vasodilation enhances the transport of nutrients and oxygen to the damaged cells and              facilitates repair and removal of cellular debris. 

 

4. Acceleration of leukocytic activity 

    * Beneficial acceleration of leukocytic activity, resulting in enhanced removal of non-viable cellular and tissue components. 

    * Thus allowing for a more rapid repair and regeneration process. 

 

5. Increased prostaglandin synthesis 

    * Prostaglandins have a vasodilating and anti-inflammatory action 

 

6. Reduction in interleukin 1 

    * Laser irradiation has a reducing effect on this pro-inflammatory cytokine that has been implicated in the             pathogenesis of rheumatoid arthritis and other inflammatory conditions. 

 

7. Enhanced lymphocyte response 

   * In addition to increasing the number of lymphocytes, laser irradiation mediates the action of both lymphatic helper T-cells and suppressor T-cells in the inflammatory response. 

   * Along with laser modification of beta cell activity, the entire lymphatic response is beneficially affected by laser therapy. 

 

8. Increased angiogenesis 

   * Both blood capillaries and lymphatic capillaries have been clinically documented to undergo significant increase and regeneration in the presence of laser irradiation. 

 

9. Temperature modulation 

   * Areas of inflammation typically demonstrate temperature variations, with the inflamed portion having an elevated temperature. 

   * Laser therapy has been shown to accelerate temperature normalization, demonstrating a beneficial influence on the inflammatory process. 


 

10. Enhanced superoxide dismutase (SOD) levels 

   * Laser stimulated increases in cytokine SOD levels interact with other anti-inflammatory processes to                    accelerate the termination of the inflammatory process. 

 

11. Decreased C-reactive protein and neopterin levels 

   * Laser therapy has been shown to lower the serum levels of these inflammation markers, particularly in                rheumatoid arthritis patients 

 

12. Increase in beta endorphins 

   * The localized and systemic increase of this endogenous peptide, after laser therapy irradiation has been            clinically reported in multiple studies, to promote pain reduction. 

 

13. Increased nitric oxide production 

   * Nitric oxide has both a direct and indirect impact on pain sensation. As a neurotransmitter, it is essential for normal nerve cell action potential in impulse transmission activity. 

   * And indirectly, the vasodilation effect of nitric oxide can enhance nerve cell perfusion and oxygenation. 

 

14. Decreased bradykinin levels 

   * Since Bradykinins elicit pain by stimulating nociceptive afferents in the skin and viscera, mitigation of                    elevated levels through laser therapy can result in pain reduction. 

 

15. Ion channel normalization 

   * Photobiomodulation promotes normalization in Ca++, NA+ and K+ concentrations, resulting in pain reduction as a result of these ion concentration shifts. 

 

16. Blocked depolarization of C-fiber afferent nerves 

   * The pain blocking effect of therapeutic lasers can be pronounced, particularly in low velocity neural                    pathways, such as non-myelinated afferent axons from nociceptors. 

   * Laser irradiation suppresses the excitation of these fibers in the afferent sensory pathway. 

 

17. Increased nerve cell action potentials 

   * Healthy nerve cells tend to operate at about -70 mV, and fire at about -20 mV. Compromised cell                          membranes have a lowered threshold as their resting potentials average around this -20 mV range. 

   * That means that normal non-noxious activities produce pain. 

   * Laser therapy can help restore the action potential closer to the normal -70 mV range. 

 

18. Increased release of acetylcholine 

   * By increasing the available acetylcholine, Laser Therapy helps in normalizing nerve signal transmission in  the autonomic, somatic and sensory neural pathways. 

 

19. Axonal sprouting and nerve cell regeneration 

   * Several studies have documented the ability of laser therapy to induce axonal sprouting and some nerve            regeneration in damaged nerve tissues. 

   * Where pain sensation is being magnified due to nerve structure damage, cell regeneration and sprouting may assist in reducing pain.

 

Laser therapy, or "photobiomodulation", has been used effectively and safely for decades now.  Not only that, but there are over 4000 studies that have been performed and published with  positive outcomes from using photobiomodulation.  Below we will briefly describe the mechanisms involved that have have been demonstrated through published research:
Here are some schematics that we found to help understand as well:
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