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Investigation of a Low-cost Portable Inline Dynamometer for Measuring Isometric Knee Extensor Strength.

Amantej Sran1, Elira Leake2, Sydney Yott1

  • 1College of Engineering University of Guelph.

International Journal of Sports Physical Therapy
|July 6, 2026
PubMed
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Low-cost inline force sensors show promise for measuring isometric knee extension torque, but individual results require cautious interpretation due to potential measurement errors.

Area of Science:

  • Biomechanics and Kinesiology
  • Rehabilitation Engineering
  • Sports Science

Background:

  • Isometric strength testing is crucial for assessing deficits and monitoring progress in rehabilitation and training.
  • The accuracy of low-cost inline force sensors compared to expensive lab-based dynamometers remains unclear.

Purpose of the Study:

  • To evaluate the agreement between a lab-based dynamometer and low-cost inline force sensors (wireless and wired) for measuring isometric knee extension torque.

Main Methods:

  • Prospective cross-sectional study involving 14 healthy adults.
  • Measurements of peak isometric knee extension torque at 90°, 45°, and 15° using a Humac dynamometer, a wireless Tindeq sensor, and a wired MLP sensor.
  • Agreement assessed via Pearson's Correlation, ICC, MDC, and Bland-Altman LOA; voluntary activation (VA) quantified using electrical stimulation.
Keywords:
DynamometerForce sensorIsometric strength testingKnee StrengthLoad cellValidation

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Main Results:

  • The Tindeq wireless sensor demonstrated minimal bias compared to the Humac dynamometer across knee angles.
  • Bland-Altman Limits of Agreement (LOA) were relatively large, indicating potential for significant individual measurement errors.
  • Inline sensors (Tindeq and MLP) showed high agreement with each other (ICC > 0.94) but lower agreement with the lab-based dynamometer (ICC < 0.80).

Conclusions:

  • Low-cost wireless force sensors like Tindeq show potential for clinical applications in strength assessment.
  • Despite small bias, large LOA necessitate cautious interpretation of individual measurements from these devices.
  • Further validation with larger sample sizes and repeated testing sessions is recommended.