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Related Concept Videos

Motor Unit Stimulation01:20

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When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
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Variability between Different Hand-Held Dynamometers for Measuring Muscle Strength.

William Du1, Kayla M D Cornett1,2, Gabrielle A Donlevy1,2

  • 1Sydney School of Health Sciences, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW 2006, Australia.

Sensors (Basel, Switzerland)
|March 28, 2024
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Summary

Interchangeability of hand-held dynamometers for muscle strength testing is crucial for using normative data. This study found several devices are interchangeable for upper and lower limb strength measurements.

Keywords:
clinical outcome assessmentsclinical trials and cohort studiesisometric muscle strengthload cell dynamometeroutcome measures

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Area of Science:

  • Biomechanics
  • Rehabilitation Medicine
  • Clinical Measurement

Background:

  • Hand-held dynamometry is vital for assessing neuromuscular disorders and treatment efficacy.
  • Standardized normative data is often used, but the interchangeability of different dynamometer devices is not well-established.
  • This lack of clarity limits the consistent application of reference values in clinical practice.

Purpose of the Study:

  • To investigate the variability and interchangeability of six commercially available hand-held dynamometers.
  • To assess isometric muscle strength across four different muscle groups in healthy individuals.
  • To determine if different dynamometers provide comparable measurements for clinical use.

Main Methods:

  • Thirty healthy individuals participated in the study.
  • Six dynamometers were calibrated and used to measure isometric muscle strength of ankle dorsiflexors, hip internal rotators, shoulder external rotators, and hand grip strength.
  • Variability was quantified using percent differences, and statistical significance was analyzed with one-way repeated measures ANOVA.

Main Results:

  • Percent differences between dynamometers ranged from 0.2% to 16%.
  • No significant differences were found between Citec, Nicholas, and MicroFET2 dynamometers for limb strength measurements (p > 0.05).
  • Grip strength measurements showed significant differences between Citec and Jamar Plus/Baseline Hydraulic (p < 0.01), but became comparable when grip circumference was controlled (p > 0.05).

Conclusions:

  • Certain hand-held dynamometers demonstrate interchangeability for measuring upper and lower limb muscle strength.
  • This interchangeability supports the broader application of normative reference values in clinical settings.
  • Careful consideration of device-specific characteristics, like grip circumference, is important for accurate strength assessment.