Laser Physics or ‘Common Sense’?
Ok, now it’s time to bring some science and reality back to laser therapy. All sorts of people are out there making claims that lasers can do all these wonderful things, and that’s true. But only, and I say only, if you follow logic, science, application and proper diagnoses. I will leave it up to you to make the final decision on what makes sense after this little blog lesson is over. I am not here to judge or make recommendations. Only to show you the ‘light’. Pun intended.
Fact 1. Wavelength determines penetration. This little fact is based on the electromagnetic spectrum of light. If you have the wrong wavelength for therapeutic application, no amount of power will make the light penetrate any deeper. The 790-820nm is the deepest penetrating wavelength. Anything lower or higher is more superficial. It’s just the law of science. Saying ‘light is light’ does not change the principle of the response. That’s like saying liquid is liquid.
Research indicates (look on PubMed for studies) that 4J-10J per cm/2 is the recommended laser dosage for deep tissue response and healing. Dosage applies to the amount of laser energy delivered per surface area. If that’s the case, let’s look at an example of what you would need for adequate response with laser therapy on a lower back. Keep in mind that at least 50% of applied laser dosagewill be lost in the superficial tissue layers before it even reaches the target area.
Simple calculations in treating a lumbar injury dictate an area of 400cm/2. This equates to between an average of 2,500 joules of energy. How much time would that take you with a 5mw laser? Let’s see. Well, with a 5mw laser it will take you 3.3 minutes to deliver 1 joule. So it will take you 8,250 minutes to deliver 2,500 joules. That is 137 hours! How much time do you have? How about at the other end of the spectrum? How long will it take a 10watt laser? Well, you get 600 joules per minute with a 10watt. It will take 4.1 minutes to get 2500 joules. How much time do you have?
I want you to think first before you leap into using a laser and believing everything you hear. Follow the research. I mean read it yourself. Don’t take any at face value. Not even mine. Learn yourself. If you want some of the research I use to substantiate my writing, e-mail me and I will be happy to supply it. We are all here to help patients get well. They deserve to have the most effective and ethical treatment options available.
Dr. Perry Nickelston
1-866-595-7749 Ext. 102
www.k-laserusa.com
