Role of endogenous opioids in 820 nm low power laser analgesia in the knees of Wistar rats

What the authors concluded

Our study has observed that low power 820 nm laser analgesic effect has suffered significant interference and was antagonized by naloxone. To justify such effect, it is inferred that the group receiving naloxone and low power laser association has maintained pain in intra-group comparison for the third evaluation moment. It is then believed that laser might have induced endogenous opioids product

Devices that emit this wavelength

Matched on wavelength within 15nm, since LED bins vary by roughly that much and a tighter match would be false precision. Where we have an irradiance figure, the session length is the time needed to reach this study's dose of 8 J/cm² at that intensity.

Matching a wavelength is not the same as reproducing a trial. Session times assume the device's published irradiance is accurate at the distance it was measured, which on brand-claim figures is often optimistic. Where a device publishes both a peak and an average we use the average, and where it publishes a falloff curve we use the lowest figure, so these times run long rather than short. Clinical protocols also control for spot size, contact and skin type in ways a home device cannot.