As with any energy treatment, the ability to heal with this particular therapeutic regimen is only equaled by its ability to affect tissues. In other words, in order for any kind of energy healing therapy to stimulate a radical change to targeted tissues it must have a corresponding ability to react with the same tissues. A laser can be left too long on a given area, thereby causing thermal increase and a potential for burns. This is true of any laser no matter what the class. Cavitation, a potential negative side effect of ultrasound, can occur when tissue cells continue to enlarge in size to the point of rupture due to built-up acoustical vibrations over the treatment area. Ultrasound poses several risks to patients, such as overheating and burning tissue, damage to blood vessels and tissue in the treatment area, and cavitation. Electrical stimulation can burn or cause pain when over-stimulation occurs. It should not be used on patients that do not have sensation in the treatment area. This theory is illustrated by several physical laws including the following:
• Bunsen Roscoe Law of Reciprocity:
(http://www.photobiology.com/reviews/bunsen/index.htm)
• The Grotthuss–Draper Law
(http://www.newworldencyclopedia.org/entry/Photochemistry)
• The Stark-Einstein Law (http://ccb.rutgers.edu/sites/default/files/coursefiles/courses_sp10/512/Handout_I_Photochemistry_I.pdf)
• The Beer-Lambert Law
http://www.pci.tu-bs.de/aggericke/PC4/Kap_I/beerslaw.htm
The therapies discussed here and following, i.e., electro-magnetic radiation, frequency harmonics therapy, electrical current, oscillating and pulsed magnetic fields, radio waves, stimulated infrared light therapy (photomedicine) and sound therapy (shockwave therapy) are all energy mediums. Conventional physics does not regard sound as part of the electromagnetic spectrum per-se. However, every frequency in the electromagnetic spectrum has a corresponding sound, even if we cannot hear it. Thus, audible and inaudible sound has an intricate relationship to electro-magnetic frequencies and can be utilized for healing. In this sense, sound acts as slow light energy and light acts fast sound.
While we have many disparate forms of vibrational energy that are used therapeutically: Photomedicine, or Laser Therapy, Pulsed Electromagnetic Field Therapy, or PEMF, Extracorporeal Shockwave Therapy, or ESWT, Transcutaneous Electrical Nerve Stimulation (T.E.N.S.), Electrical Muscle Stimulation, or EMS, and several others, only one of these offers multiphasic dose responses that are therapeutic, while all the rest only damaged tissue with increasing dosages. Laser therapy alone offers benefits at the high end of the scale, which being tissue inhibition. While tissue healing is always a primary goal, it is sometimes overtaken by the need to mitigate pain. It is at these times that photomedicine really shines.