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Reliability and validity of belt-stabilized and tension dynamometry for assessing hip strength and power in uninjured
Natanael P Batista1, Zuleiha I Rachid1, Danilo De Oliveira Silva2
1School of Exercise and Rehabilitation Sciences, Health & Human Services, University of Toledo, Mail Stop 1199, 201 W. Bancroft St, Toledo, OH, 43606-3390, USA.
Objectives:
To investigate the intra-rater reliability and validity of belt-stabilized and tension dynamometry to assess hip muscle strength and power.
Design:
Repeated measures.
Setting:
Biomechanics laboratory.
Participants:
Seventeen uninjured adults (age = 22.0 ± 2.3y; 13 females).
Main Outcomes Measures:
Peak torque (strength) and rate of torque development (RTD; power) were measured for hip abduction, internal rotation, external rotation and extension using an isokinetic dynamometer, and belt-stabilized and tension dynamometry.
Results:
For peak torque assessment, belt-stabilized and tension dynamometry showed good (Intraclass Correlation Coefficient [ICC] = 0.848-0.899) and good-to-excellent (ICC = 0.848-0.942) reliability, respectively. For RTD, belt-stabilized dynamometry showed fair reliability for abduction (ICC = 0.524) and good reliability for hip internal rotation, external rotation, and extension (ICC = 0.702-0.899). Tension dynamometry showed good reliability for all motions when measuring RTD (ICC = 0.737-0.897). Compared to isokinetic dynamometry, belt-stabilized and tension dynamometry showed good-to-excellent correlations for peak torque assessment (r = 0.503-0.870), and fair-to-good correlations for RTD (r = 0.438-0.674). Bland-Altman analysis showed that measures from belt-stabilized and tension dynamometry had clinically meaningful disagreement with isokinetic dynamometry.
Conclusion:
Tension dynamometry is reliable for assessing hip strength and power in all assessed motions. Belt-stabilized dynamometry is reliable for assessing internal rotation, external rotation, and extension. Validity of both methods is questionable, considering the lack of agreement with isokinetic dynamometry.
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