Intramuscular Heating Rates of a Chattanooga Intelect XT Therapeutic Ultrasound With 3 MHz, 1.0 W/cm2 at Three Depths up to 2.5 cm

Individual subjects will report to the research lab. They will be instructed to wear appropriate shorts or pants that can be rolled up to expose the gastrocnemius (calf) muscle. The subject will lay prone on the treatment table with the foot and lower leg off of the treatment table in a relaxed, comfortable position. The following procedures will be completed using universal precautions:

1. The investigator will prep the treatment area by having the subject flex the calf to determine the proper location for the ultrasound treatment in the middle of the medial gastrocnemius muscle belly at its largest girth.

2. A carpenter's square with markings along the vertical arm at the three experimental depths (1.0, 1.75, 2.5 cm) will be used.

3. The horizontal arm of the carpenter's square will be covered in tape. The carpenter's square is then placed just proximal to the treatment mark while the level on the horizontal arm is used to maintain a level measure.

4. Marks will be made on the muscle belly parallel to the marks on the vertical axis at 1.0, 1.75 and 2.5 cm depths.

5. A mark is also made on the horizontal arm tape in line with the treatment mark on the medial gastrocnemius.

6. The Terason uSmart 3300 diagnostic ultrasound unit will be used to measure the adipose thickness over the treatment area and look for abnormalities in the treatment and thermocouple insertion areas. Aquasonic® 100 ultrasound gel will be placed on the 15L4 transducer. The transducer with gel will be placed over the mark of the treatment area. Once the transducer is in place, the screen will be frozen and the skin and adipose thickness will be measured using the caliper tool.

7. The thermocouples will be removed from the MetriCide after sterilizing for a minimum of 12 hours prior to insertion.

8. The distal aspect of the thermocouple will be wiped dry with sterile gauze.

9. A mark with a sharpie will be made on each thermocouple just past the length marked on the horizontal arm of the carpenter's square. This allows the tip of each thermocouple to be directly below the treatment site. A second mark will be made at 5 cm to make sure the thermocouple does not go too deep into the tissue.

10. The distal end of the thermocouple will be wiped clean again using a 70% isopropyl alcohol wipe up to the marks and then the thermocouple will be wrapped in sterile gauze until it is inserted.

11. The insertion areas will be shaved to remove any body hair (if necessary) and cleaned using Betadine.

a. Once the Betadine dries, 70% isopropyl alcohol will be wiped over the insertion area and given time to dry. 5. The subject will be instructed to take two deep breaths, while the researcher lightly grasps the gastrocnemius to confirm muscle relaxation.