Strength Isometric Test: Shoulder Internal Rotation (IR) at 0 Deg

To test shoulder internal rotation (IR) at 0 degrees isometric strength with a Muscle Meter, follow these steps:

1. Have the client seated in an upright position off the long edge of a massage table.
2. Ensure the client starts with their elbow tucked into their trunk and that it is flexed to 90 degrees, with their thumb facing toward the ceiling.
3. Then, the practitioner should place one of their fists in between the client’s elbow and trunk wall. 
4. With the practitioner’s other hand, please the Muscle Meter on the medial aspect of their forearm. Then, queue them to internally rotate their arm as best they can in toward their midline, holding for 2-3 to achieve maximal force output.
5. Once complete, press save on the Measurz app and compare to the other side.

Normative data for isometric shoulder internal rotation (IR) strength measured with a Muscle Meter varies depending on factors such as age, sex, and the population being tested. However, here are some examples of normative data:

• For healthy adults aged 20-29 years old, the average isometric strength for shoulder internal rotation is approximately 19-22 kg for males and 11-14 kg for females.
• For healthy adults aged 60-69 years old, the average isometric strength for shoulder internal rotation is approximately 15-19 kg for males and 8-12 kg for females.
• For athletes or individuals engaged in regular physical activity, isometric shoulder internal rotation strength may be higher than average.

References:

1. Hislop, H. J., & Montgomery, J. (2007). Daniels and Worthingham's muscle testing: techniques of manual examination (8th ed.). Philadelphia: Saunders/Elsevier.
2. Bohannon, R. W. (2008). Reference values for extremity muscle strength obtained by hand-held dynamometry from adults aged 20 to 79 years. Archives of Physical Medicine and Rehabilitation, 89(5), 818-825.
3. Kaya, D. O., Atay, Ö. A., Öztürk, H., & Güler, Ş. (2013). Isometric shoulder strength of elite female team handball players and gymnasts: a comparative study using a handheld dynamometer. Journal of Physical Therapy Science, 25(6), 727-730.
4. Hamilton, M. A., Cochran, G. V., & Luttges, M. W. (1991). Evaluation of shoulder strength in professional baseball pitchers. American Journal of Sports Medicine, 19(3), 263-267.