Various research projects have promoted the treatment of certain diseases at different wavelengths. It is generally believed that wavelengths between 625 nm and 900 nm are most effective for healing wounds and other skin conditions. At the lower end, 630nm and 660nm seem to be favored. At longer wavelengths, the most advantageous are 850nm and 880nm.
A study by the University of Chicago found that the average wavelength of human cell tissue is between 600nm and 720nm, with 660nm being the midpoint. 660nm is better than any other frequency because it is closer to the resonance frequency of the cell tissue, which makes it absorb better in hemoglobin. This is a red protein responsible for transporting oxygen in our blood. Mitochondria can easily absorb red light with wavelengths of 630nm and 660nm, which roughly coincides with the absorption peak of cytochrome c oxidase (the target of phototherapy).
The metabolic function of mitochondria is usually limited by a biologically active molecule called nitric oxide, which binds to cytochrome c oxidase and prevents it from using oxygen. The red light breaks away the molecule so that the cytochrome c oxidase restores its energy-generating metabolic function. Use pulsating or continuous light to heal and relieve pain more deeply.
It has been found that when LED lights are pulsed, body tissues can heal faster. When it bursts continuously, it calms the cells and reduces pain. When single-frequency pulsed light is irradiated on the cell, it will stimulate the cell to start producing more protein than normal, so the cell will heal faster. Even if the LED light source is removed, the cells will continue to heal. Contrary to pulsed light, which is most suitable for healing, a continuous, stable beam can eliminate/reduce pain, reduce inflammation, and relax muscle tissue.
What has the research concluded?
The purpose of medical research on a given treatment that has shown benefit through experience or even anecdotes is to understand how and why it produces observations. Of all the studies I have reviewed, the less controversial studies are based on observations of humans.
These refer to the effects of red light on joint pain, such as tendinopathy, osteoarthritis, carpal tunnel syndrome, and musculoskeletal diseases. Even in these cases, the results indicate that the therapy has potentially moderately beneficial effects. Humility means that a meta-analysis of the effects of red light on osteoarthritis suggests that it may help in the short-term relief of joint pain and morning stiffness but to no avail.
It also shows some promising adjuvant treatment effects, which can be used for maxillofacial postoperative recovery.
