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Strength Testing with the Leg Extension

assessment Feb 15, 2018
 

Assessing the muscular strength of the lower limbs generally involves compound movements which is an excellent method to determine global lower limb strength.

However, it is often important to more finely identify deficits in individual muscle groups for injury risk analysis and the development of appropriate treatment techniques.

The leg extension, involving the subject extending the knee joint in a seated position against a shin pad, preferentially tests the quadriceps and can be conducted in either a bilateral or unilateral manner.

From the research we know that:

  • Less than 85% via the Limb Symmetry Index (LSI) in knee extension strength is considered poor and warrants further rehabilitation (Lepley, 2015)
  • Leg extension strength is a critical component of many daily activities such as rising from a chair and climbing stairs, movements that are required for maintaining independence and mobility throughout the lifespan (Paasuke, Ereline, Gapeyeva, Joost, Mottus, & Taba, 2004)

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