Why do doctors, moms, tell you to heat tense muscles?
Why do doctors, coaches, and even your mom insist on using heat for sore muscles? Whether it’s before a workout, after a tough day, or even to ease morning stiffness, heat is the go-to remedy. But what’s happening beneath the surface when you apply that comforting warmth?
The Science of Soothing: How Heat Works
When muscles work hard, they can end up tight, sore, and full of tension. This is partly due to a buildup of lactic acid from anaerobic respiration, which occurs when your body is pushed beyond its aerobic capacity. The result? Sore, stiff muscles that need some TLC (tender loving care). These muscle spasms restrict circulation and pain signals are sent to the brain.
Enter heat therapy. Applying heat deeply enough (1" or deeper) to these areas causes blood vessels to expand, or dilate, which increases blood flow. This enhanced circulation helps flush out lactic acid and other metabolic waste that’s built up during exercise. But it doesn’t stop there. The heat also relaxes tense muscle fibers, making them more flexible and less prone to spasms. And if that’s not enough, the warmth stimulates your skin's sensory receptors, which can block pain signals to the brain. In other words, it’s a triple threat: reduced pain, increased flexibility, and faster recovery.
To heat or not to heat?
Not all muscle pain is created equal. If you’re dealing with inflammation (think fresh injury, swelling, or bruising), heat might not be your friend. In these cases, ice is the better option as it narrows blood vessels, reducing swelling and numbing the area. But when it comes to tension, stiffness, or the aftermath of a hard workout, that heated pad, warm bath, or cozy towel will work wonders.
MedicalNewsToday also offers a great variety of other treatments, including heat, to help relax your muscles.
So, the next time you’re sore, listen to the advice passed down through generations—apply some heat, kick back, and let the warmth do its work. Your muscles will thank you.
