What is Moist Heat?

Moist heat therapy
Moist heat therapy. imagepointfr

What is Moist Heat?

Moist heat -- also called superficial heat -- is a physical therapy modality used to control pain, speed healing, relax muscles and increase range of motion. In a moist heat treatment, a hot pack is placed on the tight or painful area and left there for about 10 or 15 minutes.

Moist Heat Feels Good and Does Good

With the exception of certain types of massage, moist heat treatment is perhaps the most relaxing of all the physical therapy modalities.

 It's often used at the beginning of a physical therapy session to loosen your muscles, and get them ready for exercise.

About Moist Heat Packs

Moist heat packs used in physical therapy clinics are made of bentonite covered in canvas. The packs are stored in very hot (158 to 167 degree F) water. When the moist heat packs are prepared for use, they are placed in towels and/or special wraps. This not only helps to prevent burns, it also slows down cooling, giving you more time to enjoy and benefit from the treatment.  And of course it's more sanitary.

How does Moist Heat Control Pain?

Moist heat may help  control your pain by blocking pain signals from being transmitted. Application of heat may also help reduce pain by relaxing muscle spasm and enhancing healing (see below for more about that.) 

Although opinions on this differ, many experts recommend that moist heat be used only for chronic or sub-acute back or neck pain.

The thinking is:  If you put a hot pack on an acute injury, you risk increased swelling or bleeding, which may aggravate the area and cause more pain.

How does Moist Heat Speed Healing?

Put a hot pack on an injured or tight area of your back, and you'll likely increase circulation. Increased circulation speeds the delivery of blood, and therefore oxygen and nutrients.

It also accelerates the removal of waste products.

Another way moist heat helps the healing process is by increasing enzyme activity. This raises your metabolic rate, and helps release oxygen from the hemoglobin molecule into your tissues, where it helps with repair.

Moist Heat and Flexibility

Moist heat relaxes muscles and other soft tissue. In fact, your therapist may guide you in using stretching as an adjunct. Stretching during or after this treatment may result in longer-lasting improvements in flexibility and joint range of motion.


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