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The test-induced warm-up effect on hamstring flexibility tests.

Wootaek Lim1,2,3

  • 1Department of Physical Therapy, College of Health and Welfare, Woosong University, Daejeon, Republic of Korea.

Hong Kong Physiotherapy Journal : Official Publication of the Hong Kong Physiotherapy Association Limited = Wu Li Chih Liao
|March 21, 2024
PubMed
Summary
This summary is machine-generated.

The study found that performing hamstring flexibility tests, like active knee extension (AKE) and straight leg raise (SLR), can significantly improve muscle length even without specific warm-up exercises. This test-induced warm-up effect may inflate results.

Keywords:
Active knee extensionmuscle tightnessrange of motionstraight leg raise

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Area of Science:

  • Biomechanics
  • Exercise Physiology

Background:

  • The impact of active warm-up routines on acute flexibility gains is established.
  • However, the specific influence of the testing procedure itself on muscle length measurements, known as the test-induced warm-up effect, remains under-researched.

Purpose of the Study:

  • To investigate and confirm the presence and magnitude of a test-induced warm-up effect specifically within hamstring flexibility assessments.
  • To determine if repeated testing during hamstring flexibility evaluations leads to measurable improvements in range of motion.

Main Methods:

  • Participants underwent repeated trials of the active knee extension (AKE) and straight leg raise (SLR) tests.
  • Testing involved pre-intervention, six warm-up (WU) trials (with or without a 5-second hold), and post-intervention trials.
  • The study compared flexibility changes between groups performing WU trials with and without a hold.

Main Results:

  • Significant improvements in hamstring flexibility were observed between pre-intervention and post-intervention measurements for both AKE and SLR tests in all groups.
  • The data clearly indicate a warm-up effect induced solely by the performance of consecutive AKE or SLR tests.
  • This effect was evident regardless of whether a 5-second hold was incorporated during the warm-up trials.

Conclusions:

  • The results demonstrate that the testing process itself can enhance hamstring flexibility.
  • Clinicians and researchers should exercise caution when interpreting flexibility test outcomes, as the testing procedure may artificially inflate flexibility measurements.
  • Overestimation of treatment efficacy is possible if the test-induced warm-up effect is not considered.