Comparison of Isometric Portable Fixed Dynamometry to Isokinetic Dynamometry for Assessment of Hip Strength

in International Journal of Athletic Therapy and Training
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Context:

Assessment of hip strength can be performed with either isokinetic or isometric testing procedures, but the degree of association between values derived from the alternative testing methods has not been previously documented.

Objective:

To investigate the relationship between isometric peak torque and isokinetic peak torque at 60°·s-1 for various hip motions.

Participants:

Eighteen physically active males (N = 9) and females (N = 9) participated (22 ± 3 years, 173.0 ± 10.5 cm, 73.8 ± 16.7 kg).

Intervention(s):

Three isokinetic repetitions at 60°·s-1 and three isometric contractions of 5 s each for the hip fexors (HFs), hip extensors (HEs), hip abductors (ABs), hip adductors (ADs), hip external rotators (ERs), and hip internal rotators (IRs).

Outcome Measures:

Pearson correlation coefficients and coefficients of determination were calculated for both absolute and allometric-scaled peak torque values.

Results:

Meaningful associations between isometric and isokinetic peak torque values were found for each hip motion. Allometric-scaled strength values demonstrated stronger correlations than absolute strength values.

Conclusions:

The results suggest that portable fixed isometric testing of hip strength is an alternative to isokinetic testing at 60°·s-1.

Roger O. Kollock, Jr. is an assistant professor in the Department of Kinesiology and Health at Northern Kentucky University in Highland Heights, KY.

Bonnie Van Lunen is an associate professor in the School of Physical Therapy and Athletic Training at Old Dominion University in Norfolk, VA.

Jennifer L. Linza is an assistant athletic trainer at The Apprentice School in Newport News, VA.

James A. Onate is an associate professor in the School of Health and Rehabilitation Sciences at The Ohio State University in Columbus, OH.