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Related Experiment Video

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Measuring the Motor Aspect of Cancer-Related Fatigue using a Handheld Dynamometer

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Concurrent validity of handheld dynamometer measurements for scapular protraction strength.

Ricardo Marcos Liberatori Junior¹, Walter Ansanello Netto¹, Gabriela Ferreira Carvalho¹

¹Department of Physical Therapy, Universidade Federal de São Carlos (UFSCar), São Carlos, SP, Brazil.

Brazilian Journal of Physical Therapy

|August 27, 2018

Summary

Handheld dynamometers (HHD) are valid for measuring scapular protraction strength in various groups. The seated position shows better agreement with isokinetic measurements, though HHD may overestimate peak force.

Keywords:

Clinimetrics Muscle strength Outcomes measures Shoulder Shoulder instability Swimming

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Area of Science:

Orthopedics
Sports Medicine
Rehabilitation Science

Background:

Handheld dynamometers (HHD) offer a practical, cost-effective method for assessing muscle strength, increasingly used in clinical settings.
Limited data exists on the validity of HHD for specific measurements like scapular protraction.

Purpose of the Study:

To determine the concurrent validity of using HHD to measure scapular protraction strength.
To compare HHD measurements against a gold-standard isokinetic dynamometer.

Main Methods:

Concurrent validity was assessed using Pearson correlation between HHD and isokinetic measurements.
Agreement was evaluated using Bland-Altman plots for seated and supine HHD positions.
Study included individuals with anterior glenohumeral instability, healthy swimmers, and healthy sedentary subjects.

Main Results:

Moderate correlations (r=0.54-0.59) were found between HHD and isokinetic measurements across all groups.
Strong correlations (r=0.76-0.80) were observed when analyzing groups separately.
The seated HHD position demonstrated better agreement than the supine position.

Conclusions:

HHD is a valid tool for assessing scapular protraction muscle strength in athletes, non-athletes, and those with shoulder instability.
Assessing subjects in a seated position is recommended for improved accuracy.
Clinicians should be aware that HHD may overestimate peak force compared to isokinetic dynamometers.