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Strength Isometric Test: Supine Hip External Rotation

strength-isometric Jul 08, 2023
 

Here is a general overview of the testing protocol for supine hip external rotation (ER) isometric strength:

  1. Have the client adopt a supine position on a massage table with their testing leg flexed at both the knee and hip to 90 degrees.
  2. It is recommended that the practitioner set themselves up on the contralateral side of the massage table to conduct this test.
  3. Place the Muscle Meter just above the medial malleolus. Ensure the Muscle Meter remains close to the practitioner’s body. The practitioner may need to assist the client by keeping their femur stabilized throughout this protocol, in order to prevent unnecessary hip adduction. 
  4. Then, queue the client to externally rotate, pushing their lower leg in as best as they can. Ensure they hold this for 2-3 seconds to achieve maximal force production. 
  5. Upon completion, hit save on the Measurz app and compare to the other side.

Normative data for hip external rotation isometric strength with a Muscle Meter can vary depending on several factors, including age, sex, and functional level. Additionally, different studies may use different units of measurement, such as torque or force.

Here are a few examples of normative data reported in the literature:

  • One study of healthy young adults aged 18-30 years reported average peak torque values of 23.2 Nm (±6.7) for males and 13.7 Nm (±4.1) for females (Katz-Leurer et al., 2009).
  • Another study of healthy young adults aged 20-30 years reported peak force values of 17.9 kgf (±3.3) for males and 11.8 kgf (±2.1) for females (Kawczynski et al., 2020).
  • A study of healthy older adults aged 65-89 years reported peak torque values of 7.7 Nm (±3.6) for males and 4.6 Nm (±2.2) for females (Molloy et al., 2010).

 

References:

  1. Katz-Leurer, M., Rotem, H., Keren, O., & Meyer, S. (2009). Hand-held dynamometry in patients with hip fracture: reliability and validity of measurements of muscle strength. Journal of Rehabilitation Medicine, 41(7), 572-576.
  2. Kawczynski, A., Stastny, P., Petr, M., & Mostowik, A. (2020). Inter-rater reliability and measurement error of isometric hip strength measurements using a hand-held dynamometer. Journal of Human Kinetics, 73(1), 55-62.
  3. Molloy, D. W., Richardson, J. K., Crilly, R. G., & MacIntyre, D. L. (2010). A comparison of isometric, isotonic concentric and isotonic eccentric hip abductor and external rotator torque in healthy older adults. Archives of Gerontology and Geriatrics, 51(3), e90-e93.

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