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Intra-Trial Reliability and Usefulness of Isometric Mid-Thigh Pull Testing on Portable Force Plates.

Ciarán Keogh1, D J Collins1, Giles Warrington1

  • 1Department of Physical Education and Sport Sciences, Health Research Institute, University of Limerick, Limerick, Ireland.

Journal of Human Kinetics
|March 10, 2020
PubMed
Summary

Portable force plates and a customized Isometric Mid-Thigh Pull rig reliably measure peak force and force output. Impulse and rate of force development (RFD) require further familiarization for reliable measurement.

Keywords:
force time curveisometric strengthmid-thigh pullperformance testing

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Area of Science:

  • Sports Science
  • Biomechanics
  • Human Movement Analysis

Background:

  • Assessing maximal strength and power is crucial in sports science.
  • Portable force plates offer a practical alternative to laboratory-based equipment.
  • The Isometric Mid-Thigh Pull (IMTP) is a valuable test for evaluating force production.

Purpose of the Study:

  • To evaluate the intra-trial reliability and usefulness of portable force plates with a customized IMTP rig.
  • To determine the reliability and usefulness of various force metrics derived from the IMTP test.
  • To assess if the measurement system can detect meaningful changes in performance.

Main Methods:

  • Twenty male weightlifters performed familiarization and testing sessions.
  • Four IMTP tests were conducted per session.
  • Key metrics included maximum force, peak force (PF), allometrically scaled PF, impulse, and rate of force development (RFD) at specific time points.

Main Results:

  • Maximum force, absolute PF, relative PF, and allometrically scaled PF demonstrated high reliability (ICC ≥ 0.91, CV ≤ 9.8%) and usefulness.
  • Force outputs at 150, 200, and 250 ms showed marginal to good usefulness.
  • Impulse and RFD exhibited unreliable results (ICC ≤ 0.91, CV ≥ 10%) across all time points.

Conclusions:

  • Portable force plates and customized IMTP rigs are reliable for measuring peak force and force output.
  • These tools can detect the smallest worthwhile change (SWC) in maximum and absolute force measures.
  • Enhanced familiarization may improve the reliability of impulse and RFD measurements.