Effet lumière infrarouge douleurs articulaires

The infrared lamp for relieving joint pain?

Infrared light therapy, also known as photobiomodulation, is used in various contexts and could potentially alleviate joint and muscle pain. What does scientific literature tell us about this? Continue reading to find out.

Can infrared lamps reduce joint pain?

Invisible to the naked eye, the infrared light is part of the electromagnetic spectrum, just beyond visible red. It is generally divided into three categories according to wavelength: near infrared (from 700 to 1400 nm), mid-infrared (from 1400 to 3000 nm), and far infrared (beyond 3000 nm). In the context of medical or domestic devices, such as infrared lamps, it is primarily near and mid-infrared that are used. This light is distinguished by its ability to penetrate the skin deeply, much more than UV or visible light. It interacts with tissues by producing a gentle heat that can reach the dermis, muscles, and sometimes even the joints, thus having a soothing effect on pain.

Indeed, when it is absorbed by tissues, the infrared light causes a localized increase in temperature. This increase induces vasodilation, which is an expansion of the blood vessels, leading to a greater influx of blood in the irradiated area. The increase in blood flow enhances oxygenation and nutrient supply at the joint level, while facilitating the elimination of metabolic waste, such as lactic acid or certain pro-inflammatory molecules. Infrared light thus helps to better regulate inflammation, which results in a decrease in pain.

Beyond its thermal effect, infrared light interacts with mitochondria, specifically with complex IV of the respiratory chain, corresponding to cytochrome c oxidase. This interaction leads to an increase in the production of ATP, the energy necessary for the proper functioning of cells, but also to a decrease in the expression of certain pro-inflammatory cytokines, such as IL-1β, TNF-α, and PGE2. These molecules are known to maintain pain and inflammation in joint tissues, particularly in cases of osteoarthritis. By limiting their production, infrared light helps to alleviate pain.

By increasing the local temperature at the joints and reducing the production of pro-inflammatory cytokines, infrared light can help alleviate joint pain.

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Infrared light and joint pain: what is the clinical evidence?

The effectiveness of infrared light in soothing joint pain (as well as muscle pain) has been demonstrated in numerous studies. One of these, conducted with 90 individuals suffering from temporomandibular joint disorders, is particularly noteworthy. The patients were randomly divided into three groups: a study group, a placebo group, and a medication group. The study group received an at-home protocol of eight minutes twice a day for a week with an infrared lamp (808 nm, 5 J/min, 250 mW, 15 KHz) on the painful area. The placebo group followed the same protocol but with sham devices. The medication group received conventional painkillers. Pain was assessed using a 100-point visual analog scale (VAS) before and after treatment.

The results, presented below, show a significantly greater average reduction in pain for the study group compared to the placebo group. This decrease was comparable to that recorded in the medication group.

Study Group (Infrared Lamp)Placebo GroupMedication Group
Reduction in pain by 35.17 pointsReduction in pain by 22.14 pointsReduction in pain by 36.55 points
Observed pain reduction in the study groups, placebo, and medication.
Source: DEL VECCHIO A. & al. Assessment of the effectiveness of a new home protocol for low-level laser therapy in managing pain associated with temporomandibular joint disorder: A randomized, double-blind, placebo-controlled clinical trial. Cranio (2021).

However, while infrared light can help alleviate joint pain, it's crucial to understand that there are usage precautions and contraindications associated with its use. If you're using a device at home, always ensure to follow the manufacturer's instructions carefully, whether it's about the duration and frequency of exposure or the power used. Moreover, note that these devices are not suitable for everyone and should not be used by pregnant or breastfeeding women, as a precautionary measure, nor by individuals undergoing photosensitizing treatment, those with coagulation disorders, skin cancer, or suffering from an active phase of inflammatory dermatosis. Lastly, in case of doubt or to obtain advice, it's always best to refer to a healthcare professional.

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