Mastering the use of hand-held dynamometry in clinical practice

Area of Science:

• Biomechanics
• Exercise Physiology
• Clinical Measurement

Background:

• Muscle performance metrics like strength and rate of force development (RFD) are vital for function, rehabilitation, and healthy aging.
• Clinicians utilize objective dynamometry for muscle performance assessment, but device variability (sampling frequency, load capacity) impacts accuracy.
• Inconsistent testing environments and protocols introduce measurement error, potentially rendering tests insensitive to genuine performance changes.

Purpose of the Study:

• To guide clinicians in critically evaluating dynamometer utility and selecting appropriate devices.
• To provide knowledge on constructing robust assessment protocols for high-quality muscle performance data collection.
• To enhance understanding of true performance changes versus measurement-induced variability in individual assessments.

Main Methods:

• Critical review of technical specifications and characteristics of various dynamometers.
• Analysis of methodological factors influencing measurement accuracy in muscle performance testing.
• Development of evidence-informed guidelines for assessment protocol construction.

Main Results:

• Substantive differences exist between dynamometers affecting accuracy (sampling frequency, load capacity, force onset detection).
• Assessment environment and protocol inconsistencies significantly inflate measurement error.
• Distinguishing true performance changes from measurement error is critical for individual assessments.

Conclusions:

• Careful selection of dynamometers and standardized protocols are essential for valid and reliable muscle performance measurement.
• Understanding methodological factors is paramount for clinicians to ensure measurement precision, especially for tracking individual progress.
• Accurate muscle performance data supports informed clinical decisions in rehabilitation and return-to-play contexts.