12/16/2023 0 Comments Negative feedback examples physics![]() ![]() I avoid moving which results in “weakness” and amplifies the problem. My nervous system associates movement with pain. I become fearful which makes me hyperaware of any sensation coming from my back. That is a positive feedback loop.Īnother example. This can result in more pain, which results in more valgus/weakness, which results in more pain, and so on and so forth. Biomechanical studies have shown that this also significantly increases the contact pressures at the patellofemoral joint. This is consistent with all of the descriptive studies of these patients. I start doing that hip internal rotation/knee valgus thing we all see and the muscles (specifically quadriceps and hip abductors/external rotators) start getting “weaker”. I’m worried that I am damaging something so I start favoring that leg. Let’s say that my knee starts bothering me for whatever initial reason. So what does this have to do with orthopedic injuries? That’s why that god-awful screech rapidly gets louder until someone pulls the microphone away. Round and round it goes amplifying itself. The microphone picks up the sound from the audio speaker which then goes through the microphone and back out of the audio speaker. You know when you are sitting at a conference and the microphone gets too close to an audio speaker? What happens? “Feedback”. The easiest example of this is audio feedback. This means that the effects perpetuate themselves. A results in B which then increases A therefore increasing B. But what about positive feedback? In a positive feedback loop, the exact opposite happens. Problems that enter a negative feedback loop solve themselves. Of course, there are thousands of examples of this not just in medicine but in physics, sociology, geology, etc. It doesn’t just relate to pain, it can relate to blood pressure, pH levels, respiration, etc. This is what makes it negative – It reduces or takes away the effects. During a negative feedback loop, the system inherently reduces itself. For example, when someone develops lateral epicondylitis from overuse ( A), the pain ( B) inherently causes the person to decrease use of the affected muscle ( A) which results in decreased pain ( B). ![]() A results in B which then reduces A therefore reducing B. To understand this better, we can look at negative feedback. Sounds circular? Well, that’s because it creates a loop. Feedback is where the result of a cause has a resultant effect on the cause (Don’t worry, I’ll clarify). Simple Feedback By Trevithj (Own work), via Wikimedia CommonsFirst, let’s talk about feedback. Sure, we can provide education and/or a referral to a surgeon but that would only be one visit and does not warrant “treatment”. Now, it should be obvious that physical therapy would have an essentially minimal role in these first two categories. Category 2 includes things like traumatic Bankart lesions, multi-ligament knee injuries, and severe radiculopathy that have failed conservative care (Again, don’t argue, just read on). They are self-limiting and all spontaneously improve without treatment (Don’t argue at this point, just read on). Category 1 includes things like lateral epicondylitis (or just about any acute tendonitis), adhesive capsulitis, or acute low back pain. Injuries that result in a positive feedback loop (what?) Injuries that require surgery to correctĬategory 3. Injuries that will heal on their own with timeĬategory 2. Let’s look at the three main categories of orthopedic (or “orthopaedic” with that pretentious “a” in the middle if you prefer) injuries:Ĭategory 1. Research shows that a lot of our interventions are unnecessary and ineffective especially when explained by the horribly false ideas of “stuck” joints that need mobilizations, tissues that are adhered and need “release”, and complex movement “disorders”. Well, I can do that! Being a stoopid person myself, I can really relate! Now it is MY turn to “think out loud”. You like simple things that are quick to learn and then apply to your world. Now Internet, I know how you get about ambiguity. In my opinion, physical therapy is most effective at removing something positive from our patients. Remember “positive” does not mean “good” when we talk science. ![]()
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