Performance tests for the posterior chain: Comparison of three different assessment methods

Area of Science:

• Biomechanics
• Sports Science
• Musculoskeletal Research

Background:

• Assessing posterior chain strength is crucial for athletic performance and injury prevention.
• Various tests exist, but their interchangeability and validity for evaluating posterior chain function remain debated.
• Isokinetic testing, the Bunkie Test, and the Isometric Posterior Chain Test (IPCT) are commonly used.

Purpose of the Study:

• To compare the validity and reliability of three posterior chain performance tests: isokinetic hamstring strength, Bunkie Test, and IPCT.
• To determine if these tests can be used interchangeably for assessing posterior chain strength and limb symmetry.
• To evaluate the cost- and time-effectiveness of each test.

Main Methods:

• A cross-sectional study involving 29 healthy participants (16 females, 13 males).
• Measurements included isokinetic hamstring strength at 60°/s, Bunkie Test performance, and standing 90:20 Isometric Posterior Chain Test (IPCT) performance.
• Statistical analysis was performed to assess agreement between the tests for strength and limb asymmetry.

Main Results:

• All three tests evaluate posterior chain function but differ in validity, reliability, objectivity, cost, and time.
• The IPCT demonstrated high agreement with isokinetic hamstring strength measurements.
• The Bunkie Test showed no significant interaction with isokinetic measurements or the IPCT.
• None of the tests showed agreement in detecting limb asymmetries.

Conclusions:

• The IPCT is a viable alternative to isokinetic testing for hamstring strength assessment.
• The Bunkie Test and IPCT are not interchangeable with isokinetic tests or each other for overall posterior chain assessment.
• These tests should be used complementarily rather than interchangeably, especially for assessing limb asymmetries.
• Limb asymmetry assessment should not rely solely on the IPCT or Bunkie Test for knee flexion strength.