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Activator Methods International Ltd.
2950 N. Seventh Street, Suite 200
Phoenix, AZ 85014
ofc 602-224-0220
fax 602-224-0230
toll free 1-800-598-0224
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Subject: Activator Methods Isolation Tests, Leg Alignment Reactivity |
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| Title: Optoelectric Measurement of Changes in Leg Length Inequality Resulting from Isolation Tests. |
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| Reference: De Witt JK, Osterbauer PJ, Stelmach GE, Fuhr AW. Optoelectric measurement of changes in leg length inequality resulting from isolation tests. J Manipulative Physiol Ther 1994; 17(8):530-538. |
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Abstract: Objective: a) Establish a precise, standardized method to assess prone leg alignment changes (functional "leg length inequality"), which have, until now, been reported clinically to occur as a result putative chiropractic subluxation isolation tests [neck flexion (C1-2) and extension (C5)]; and b) describe differences in leg alignment changes in a group of healthy subjects and patients with chronic spinal complaints.
Design: Two group, two isolation tests, descriptive, repeated measure analysis of variance.
Setting: Exercise and Sport Research Institute, Arizona State University
Participants: Eight healthy controls, eight patients with a history of chronic spinal complaints and observable leg alignment reactivity.
Interventions: Active cervical flexion/extension maneuvers.
Outcome Measures: Optoelectric markers affixed to heels and occiput, as subjects lay prone. Marker locations sampled at 100 Hz for 10 sec during; a) three no movement trials, b) three cervical extension and c) three flexion trials. Data transformed to local reference frame approximately each subject's longitudinal axis prior to analysis..
Results: Heel position movement occurred during trials and were individualistic. Patients exhibited more asymmetrical movements that the controls during the head-up trials. No differences existed between controls and patients for range of heel displacement of net displacement.
Conclusions: The results of this study allow the following to be concluded: 1) small leg displacements (< 1 mm) were recorded by the optoelectric measurement system; 2) heel position changes during the isolation tests were identifiable; 3) as a result of head-up maneuvers, patients exhibited more asymmetrical heel movement than controls (t = 8.743, p < .01); 4) The heel range of motion was not different between the groups; and 5) The net change in asymmetrical heel motion during the heads-up isolation tests, suggesting that some phenomena may separate these two groups, warranting future study. J Manipulative Physiol Ther 1994; 17 (8): 530-538. |
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| Key Words: Leg Length Inequality, Chiropractic, Biomechanics. |
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