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Related Concept Videos

Non-destructive Tests for Concrete Strength01:12

Non-destructive Tests for Concrete Strength

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The rebound hammer test, also known as the Schmidt hammer test, is a non-destructive technique for evaluating the hardness of concrete and, indirectly, the strength of concrete. It operates on the principle that the rebound of a spring-driven mass from a concrete surface correlates to the surface's hardness. The device comprises a mass within a tubular housing, a spring mechanism, and a plunger that strikes the concrete. Upon release, the energy imparted to the mass by the spring causes it...
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Related Experiment Video

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Muscle Imbalances: Testing and Training Functional Eccentric Hamstring Strength in Athletic Populations
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Reliability and Validity of the End Range Hamstring Strength Test with Handheld Dynamometry.

Jakob Kristiansen1, Christina Eddy1, Stig Peter Magnusson1

  • 1Department of Physical and Occupational Therapy Bispebjerg Hospital.

International Journal of Sports Physical Therapy
|March 5, 2024
PubMed
Summary
This summary is machine-generated.

Handheld dynamometers (HHD) offer a reliable and valid method for assessing hamstring strength at maximal length, serving as a practical alternative to isokinetic testing for injury prevention and rehabilitation.

Keywords:
HamstringHandheld dynamometryReliabilityStrengthValidity

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Area of Science:

  • Biomechanics
  • Sports Medicine
  • Rehabilitation Science

Background:

  • Assessing hamstring strength is vital for rehabilitation and injury prevention.
  • Current methods like isokinetic testing can be resource-intensive.
  • Evaluating alternative, accessible tools is necessary for widespread clinical application.

Purpose of the Study:

  • To determine the reliability and validity of handheld dynamometer (HHD) measurements for hamstring strength.
  • To compare HHD strength assessments in a maximally lengthened position against gold-standard isokinetic testing.
  • To establish HHD as a viable tool for hamstring strength evaluation.

Main Methods:

  • Isometric hamstring strength testing was conducted on 20 healthy participants.
  • Measurements were performed using both a Biodex isokinetic machine and a handheld dynamometer (HHD).
  • Testing was repeated on two separate occasions to assess reliability.

Main Results:

  • A strong positive correlation (r=0.87) was observed between HHD and Biodex measurements.
  • Bland-Altman analysis confirmed agreement between the two testing methods.
  • The HHD demonstrated excellent intra-rater reliability (ICC=0.91-0.93) and moderate to good inter-rater reliability (ICC=0.71-0.83).

Conclusions:

  • The handheld dynamometer (HHD) is a reliable and valid instrument for assessing hamstring strength at maximal muscle lengths.
  • HHD testing offers a cost-effective and accessible alternative to isokinetic dynamometry in clinical settings.
  • This method can aid in monitoring rehabilitation progress and identifying strength deficits for return-to-play decisions.