Strength Isometric Test: Shoulder External Rotation (ER) at 0 Deg

To test shoulder external rotation (ER) 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. The practitioner may wish to have the Muscle Meter wedged between the lateral aspect of the client’s forearm and their own trunk. This will allow for increased leverage and more accurate and reproducible data. 
5. Once set, queue the client to externally rotate their arm as best they can, holding for 2-3 seconds to achieve peak force production.
6. Once complete, press save on the Measurz app and compare to the other side.

Normative data for isometric shoulder external rotation (ER) strength measured with a Muscle Meter can vary 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 external rotation is approximately 16-20 kg for males and 8-11 kg for females.
• For healthy adults aged 60-69 years old, the average isometric strength for shoulder external rotation is approximately 10-15 kg for males and 6-9 kg for females.
• For athletes or individuals engaged in regular physical activity, isometric shoulder external rotation strength may be higher than average.

References:

1. Norkin, C. C., & White, D. J. (2016). Measurement of Joint Motion: A Guide to Goniometry (5th ed.). Philadelphia: F.A. Davis Company.
2. Kendall, F. P., McCreary, E. K., Provance, P. G., Rodgers, M. M., & Romani, W. A. (2005). Muscles: Testing and Function, with Posture and Pain (5th ed.). Baltimore, MD: Lippincott Williams & Wilkins.
3. Bohannon, R. W. (2009). Hand-held dynamometry: reliability of lower extremity muscle testing in healthy adults. Clinical Rehabilitation, 23(4), 259-267.
4. Lintner, D., Mayol, M., & Uzodinma, O. (2007). Glenohumeral internal rotation deficits in professional pitchers enrolled in an internal rotation stretching program. American Journal of Sports Medicine, 35(4), 617-621.