Photobiomodulation (Low-Dose Laser and LED Light Therapy)

What Is Photobiomodulation?

Photobiomodulation (PBM for short) is a painless and non-invasive approach that aims to support cellular function by applying red and near-infrared light of certain wavelengths, at low power levels, onto tissue. This method is sometimes also called 'low-dose laser therapy' (LLLT - Low-Level Laser Therapy) in the literature; today it can be applied with devices based on both lasers and LEDs (light-emitting diodes).

The core idea behind using photobiomodulation in cerebral palsy is that the light, by passing through the skull (transcranial application) or by being applied directly to the affected muscle/joint areas, supports the function of the cell's energy production centers (the mitochondria).

Mechanism of Action: Supporting Cellular Energy

The core mechanism of photobiomodulation rests on an enzyme in the mitochondria called cytochrome c oxidase absorbing light of certain wavelengths and increasing its activity. This enzyme plays a key role in producing ATP, the cell's energy currency; increasing its activity means supporting the cell's capacity to produce energy. In the area of brain injury, in cells where energy production is limited but not completely lost, this support can contribute to cell survival and functional recovery.

In addition, photobiomodulation is also proposed to create anti-inflammatory effects, to increase local blood flow (the microcirculation), and to support the release of certain growth factors. This multiple mechanism of action suggests that the method may contribute not to just one biological pathway but to several components of cellular health at once.

Methods of Application: Transcranial and Peripheral

Photobiomodulation can be applied in two basic ways: transcranial application rests on the light passing through the skull to target the brain tissue directly and is usually considered for cognitive/neurodevelopmental goals. Peripheral application, meanwhile, is applied directly to spastic or contracted muscle and joint areas to support local blood flow and tissue healing; this form of application is sometimes integrated into physiotherapy sessions.

The length and dose of application (the light's power, wavelength, application time, and frequency) vary depending on the device used and the tissue being targeted; choosing these parameters correctly is important for both safety and effectiveness; a dose that is too low may be ineffective, while an excessively high dose can reverse the expected benefit (in some sources this is called the 'biphasic dose-response curve').

Using It Together with Other Treatments

Photobiomodulation, just as with exosome and TMS treatments, is planned not on its own but together with an intensive rehabilitation program, as a complementary component. In some centers, photobiomodulation sessions can be sequenced within the same day alongside physiotherapy or an exosome application, so that they support one another.

Safety Profile and Expectations

Photobiomodulation, when applied with the correct parameters, is a painless method generally considered safe; the most commonly reported side effect is a temporary feeling of warmth at the site of application. Using protective goggles so the eyes are not directly exposed to the light is a standard safety measure.

The level of scientific evidence in this field, as with TMS and exosome treatments, is still a developing area of research. When evaluating photobiomodulation, as with other new treatment approaches, I encourage you to approach it with realistic expectations and to clarify its suitability for your child together with me.