Isometric Force-Time Curve Assessment: Accuracy, Precision, and Repeatability of a Mobile Application and Portable...

Area of Science:

• Biomechanics and Exercise Physiology
• Sports Science and Rehabilitation Technology

Background:

• Strength assessment is crucial in sports performance, physical rehabilitation, and general health.
• Accurate and reliable measurement tools are essential for evaluating muscle function.

Purpose of the Study:

• To compare the accuracy and reliability of a portable DINABANG device against a standard BIODEX isokinetic dynamometer for knee extensor strength assessment.
• To evaluate both maximal voluntary isometric contractions (MVICs) and paired voluntary isometric contractions (VICs) using both devices.

Main Methods:

• Nineteen healthy volunteers participated in the study.
• Maximal voluntary isometric contractions (MVICs) and paired voluntary isometric contractions (VICs) of knee extensors were measured using both BIODEX and DINABANG.
• Repeatability, accuracy (bias), and precision (limits of agreement) were statistically analyzed using ICC and Bland-Altman plots.

Main Results:

• Excellent repeatability (ICC: 1.00) and trivial effect were found for MVICs between BIODEX and DINABANG, with high accuracy (bias: 0.12 Nm) and consistent precision.
• Excellent repeatability (ICC: 1.00) and trivial effect were also observed for VICs, with high accuracy (bias: 0.24 Nm) and consistent precision.
• The portable DINABANG device demonstrated comparable performance to the BIODEX system.

Conclusions:

• The DINABANG device is accurate, precise, and reliable for measuring knee extensor torque.
• This portable device offers a viable alternative for strength assessment in various settings, including sports performance and rehabilitation.