Assessing hip abduction and adduction strength: can greater segmental fixation enhance the reproducibility?

Abstract:

OBJECTIVE:To improve the reproducibility of testing hip abduction and adduction using an isokinetic dynamometer by a novel testing protocol. DESIGN:Test-retest design. SETTING:Biodynamics laboratory. PARTICIPANTS:Fifteen healthy subjects (9 men, 6 women; age, 22.4+/-0.5 y) were recruited. INTERVENTIONS:Two setups were compared: the first according to manufacturer's guidelines (setup A) and the second a novel setup incorporating pelvic fixation (setup B). Setups A and B were performed in a random order. Both setups included the same battery of isokinetic (30 degrees/s, 60 degrees/s) and isometric tests, and were repeated 1 week later. MAIN OUTCOME MEASURES:The peak torque for each abduction and adduction exercise was noted and pelvic motion during testing was recorded. RESULTS:Setup B significantly (P<.05) reduced transverse pelvic rotation by between 7.5 degrees and 8.0 degrees dependent on test speed. Mean differences for reproducibility of peak torque, ranged from 0.8 to 11.7 Nm. The coefficients of repeatability of both setups were similar, ranging from 21.4 to 56.3 Nm across isokinetic exercises. A similar observation was noted for isometric exercises, with the differences between the coefficients of repeatability ranging from 18.6 to 40.0 Nm. CONCLUSIONS:Reducing pelvic rotation does not enhance reproducibility of the system and is not related to torque production. Further research is required to determine the optimal test setup.

journal_name

Arch Phys Med Rehabil

authors

Laheru D,Kerr JC,McGregor AH

doi

10.1016/j.apmr.2007.05.017

subject

Has Abstract

pub_date

2007-09-01 00:00:00

pages

1147-53

issue

9

eissn

0003-9993

issn

1532-821X

pii

S0003-9993(07)00381-4

journal_volume

88

pub_type

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