Isokinetic Hip Abductor to Adductor Torque Ratio in Normals

Article type: Research Article

Authors: Donatelli, Robert^{a; *; **} | Catlin, Pamela A.^{a; ***} | Backer, Gwendolyn S.^{a; ****} | Drane, Debora L.^{a; *****} | Slater, Susan M.^{a; ******}

Affiliations: [a] Emory University School of Medicine

Note: [*] Instructor, Division of Physical Therapy, Department of Rehabilitation Medicine, Emory University School of Medicine, Atlanta, GA, and Certified Orthopaedic Physical Therapist at Physical Therapy Associates of Metro Atlanta, Atlanta, GA.

Note: [**] Address reprint requests to Mr. Donatelli at Physical Therapy Associates of Metro Atlanta, 6909 Tara Boulevard, Jonesboro, GA 30236.

Note: [***] Associate Professor and Director, Division of Physical Therapy, Department of Rehabilitation Medicine, Emory University School of Medicine, Atlanta, GA.

Note: [****] At the time of the study, Ms. Backer was a student in the Master of Physical Therapy Program, Division of Physical Therapy, Department of Rehabilitation Medicine, Emory University School of Medicine, Atlanta, GA.

Note: [*****] Medical University of South Carolina. At the time of the study, Ms. Drane was a student in the Master of Physical Therapy Program, Division of Physical Therapy, Department of Rehabilitation Medicine, Emory University School of Medicine, Atlanta, GA.

Note: [******] Little Rock Sports Therapy, Little Rock, AK. At the time of the study, Ms. Slater was a student in the Master of Physical Therapy Program, Division of Physical Therapy, Department of Rehabilitation Medicine, Emory University School of Medicine, Atlanta, GA.

Abstract: The purpose of this study was to determine a relationship between hip abductor and adductor muscle force output measured isokinetically in normal adult subjects. Bilateral testing of 42 normal subjects ages 21−36(n=84) was performed isokinetically (MERAC) in a −5 deg to 35 deg range of motion (ROM) at 60 deg/sec. Subjects were positioned on the test bench lying on their side with test limb up, knee extended, and leg in neutral rotation. The mean peak abductor: adductor torque output ratio was 1 : 2.30 (0.44) for the total sample. As motion occurred in the coronal plane, a statistically significant change in mean abductor: adductor torque ratio was determined in the test sample. A statistically significant positive correlation between hip abductor and adductor muscle force output existed through motion in the coronal plane between 0 to −30. Because two-thirds of the test sample was composed of females, these results may be less applicable to male clients and generalization may also be limited due to specific instrumentation.

Keywords: Lower kinetic chain, isokinetics, abductor, adductor, isokinetic torque ratio

DOI: 10.3233/IES-1991-1209

Journal: Isokinetics and Exercise Science, vol. 1, no. 2, pp. 103-111, 1991