The History of Photobiomodulation: From Early Discoveries to Modern Therapeutic Advances
Background
Light has always fascinated, healed, and inspired us. It was only over time that science was able to explain how it works. Ancient civilizations were already trying to harness its benefits. This marks the beginning of a long history.
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Early uses: Antiquity and the Middle Ages
In ancient times, particularly in Egypt and Greece, heliotherapy (sun therapy) was already being practiced. The healings attributed to Apollo clearly illustrate the deep-rooted cultural belief in the power of light.
The Middle Ages did not elaborate on this practice to the same extent. However, many empirical practices persisted. Alchemy, for example, focused on the effects of light on matter and, possibly, on the body.
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The Renaissance and the 17th Century: A Renewed Interest in Science
The modern era brought a new approach. Thinkers such as Isaac Newton began to unravel the properties of light. These conceptual advances would later pave the way for the rise of photobiomodulation.
18th and 19th Centuries: From Physics to Medicine
It was during this period that science began to demystify radiation. Scientists such as Herschel and Ritter discovered infrared and ultraviolet rays, respectively. This radically changed our understanding of the light spectrum.
At the same time, the medical community began to explore heliotherapy more systematically. Pioneers such as Gustave Bernheim published studies on the effects of sunlight on healing.
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The 20th Century: Growth and Scientific Rigor
The 20th century marked the dawn of modern photobiomodulation. Three key decades stand out.
1950s–1960s: An accidental discovery
In the 1960s, Énde Mester, a Hungarian researcher, conducted experiments on the effects of a ruby laser on wounds in rats. By chance, he observed that healing was accelerated. This discovery marked the dawn of modern photobiomodulation.
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1970s–1990s: In-depth research
Over the decades, researchers such as Harry Whelan and other laboratories have developed a deeper understanding of biological mechanisms. The research has expanded to cover many areas, including wounds, pain, and inflammation.
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The 2000s and beyond: commercialization and the general public
The 21st century has seen the rise of LED devices. Lower costs, miniaturization, and improved safety have made PBM accessible to the general public. Doctors, athletes, and individuals now use this technology on a daily basis.
The trend continues
Modern leading figures
In the 20th and 21st centuries, scientists and physicians laid the groundwork for modern PBM. Their work continues to influence research today.
Understanding the key contributions
The scientific story: ATP and cytochrome c oxidase
A key aspect of PBM concerns its cellular mechanism of action. This understanding has developed gradually over the decades. The role of ATP, in particular, has emerged as central.
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From Controversy to Acceptance
PBM was initially met with skepticism by the scientific community. Over time, mounting evidence has shifted attitudes. Today, despite some ongoing debate, PBM is gaining increasing recognition, particularly in the fields of rehabilitation and dermatology.
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Future Outlook
PBM continues to evolve. Future research should shed light on aspects that are still unclear, optimize protocols, and expand the scope of its applications. New devices and approaches will certainly emerge.
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