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Related Experiment Video

Updated: Apr 6, 2026

In Vivo Measurement of Hindlimb Dorsiflexor Isometric Torque from Pig
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Effect of Sampling Frequency on Isometric Midthigh-Pull Kinetics.

Thomas Dos'Santos1, Paul A Jones, Jonathan Kelly

  • 1Human Performance Laboratory, University of Salford, Greater Manchester, UK.

International Journal of Sports Physiology and Performance
|July 29, 2015
PubMed
Summary
This summary is machine-generated.

Lower sampling frequencies, such as 500 Hz, are reliable for isometric midthigh pull (IMTP) testing. This finding supports using lower frequencies for accurate assessment of skeletal muscle function, including peak force and rate of force development (RFD).

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Area of Science:

  • Biomechanics
  • Sports Science
  • Human Movement Analysis

Background:

  • Skeletal muscle function is crucial in sports performance and injury prevention.
  • Isometric midthigh pull (IMTP) is a common test to assess muscle strength and power.
  • Previous IMTP studies have used varied sampling frequencies (500-1000 Hz) without clear justification.

Purpose of the Study:

  • To investigate the impact of different sampling frequencies on IMTP kinetic variables.
  • To determine the minimum effective sampling frequency for accurate IMTP data.
  • To analyze the influence on peak force, time-specific forces, and rate of force development (RFD).

Main Methods:

  • 30 academy rugby league players participated.
  • Isometric midthigh pull (IMTP) tests were conducted using a 2000 Hz force platform.
  • Data were down-sampled to 1500 Hz, 1000 Hz, and 500 Hz for comparative analysis.

Main Results:

  • All tested sampling frequencies demonstrated high within-session reliability (ICC ≥ .80, CV ≤ 10.1%).
  • No statistically significant differences were found in kinetic variables (peak force, RFD) across sampling frequencies (P > .05).
  • High reliability was consistent across all frequencies for all measured kinetic variables.

Conclusions:

  • Sampling frequencies as low as 500 Hz are sufficient for accurate IMTP assessments.
  • Practitioners can confidently use 500 Hz for measuring peak force and RFD.
  • This supports efficient data collection without compromising the reliability of skeletal muscle function measures.