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overdone it with exercise knows that fatigue is a common side effect. In athletes, there is “overtraining syndrome” which is associated with stalled progress, fatigue, depression, headaches, insomnia, weakened immune function, and many other symptoms. In short, exercise is an incredible and powerful medicine for us. But only when done in the right amounts. Too much, and you may negate the benefits. And if you really overdo it in an extreme way, it actually damages your cells. Many other things are like this too – sun exposure is associated with numerous health benefits, but if you do too much, you can get severe sunburns, accelerated aging, skin damage, and potentially skin cancer. Red and near-infrared light are the same way. You must use them in the right dose to get the benefits. Too much and you negate the benefit. Fortunately, red and near-infrared light are safer and have less potential for harm (when you overdo it) than either sunlight or physical exercise. Therefore, it’s extremely safe! I even know some people who have used red light therapy for decades and believe that it’s very hard to realistically overdo it in a way that negates the benefits. Generally, if you overdo it slightly, you won’t likely notice any negative effects whatsoever. And many people won’t even notice negative effects if they overdo it by a lot. But if you massively overdo the dose, it’s common to feel some fatigue or get a slight headache. That’s typically as bad as gets for most people. Someone with severe health issues who is more fragile may notice very significant fatigue for a day or two following overdosing it with the red/NIR light (much as they would if they overdid exercise). Basically, there is very limited potential for side effects with overdosing, particularly when compared with exercise or sun exposure. So if you you feel a little fatigued after using it, that’s usually just a sign that you overdid the dose a little. Lower the dose, and the problem is solved. Just think about this: If you got really sore and fatigued after doing an intense workout, would you conclude “exercise is terrible for you – it just makes you inflamed and fatigued... I quit!”? Or would you think along these lines: “I know that there are thousands of studies showing that exercise is highly beneficial to health, but I’m really tired and inflamed from this last workout, so I better back off the intensity/duration of the workouts and do a dose that is more appropriate for my body and my fitness level.” Hopefully the latter. Key point: Red/NIR light is exactly the same principle. Since this phenomenon is well-known, and we know that it applies to red and near-infrared light therapy, what causes it? It’s not completely understood, but there are several theories: • Excessive Reactive Oxygen Species (ROS). All hormetic stressors produce some ROS or “free radical species.” These ROS are vital for building up the internal anti-oxidant defense system (the A.R.E. or Antioxidant Response Element) and are vital for your body to gain the benefits of things like exercise or light therapy. But, they still produce free radicals that oxidize, and if they are produced in too large amounts that overwhelm the body’s capacity to quench those free radicals, cell damage can occur. Also, some people may have a very weak internal antioxidant defense system that is easily overwhelmed by even small amounts of hormetic stressors like light therapy or physical exercise. In this case, the exercise or light therapy doesn’t create a small stimulus that the body adapts to successfully – the body is overwhelmed by it and cannot deal with the stressor, and thus, cell damage occurs. • Excessive Nitric Oxide (NO). Another potential mechanism is excessive NO release. NO servesPDF Image | Red Light Therapy Ultimate Guide
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