The Relationship Between Spinal Dysfunction and Reaction Time Measures
Received 3 February 2004; received in revised form 11 August 2004
Abstract
Objective
The objective of this study was to investigate the relationship between the number of sites of spinal dysfunction and a range of measures of cognitive processing.
Methods
This double-blind, randomized, observational pilot study was performed at a chiropractic college clinical training facility. Thirty volunteers with clinical evidence of cervical spinal joint dysfunction participated. Subjects were classified into 2 groups depending on whether they exhibited signs of cervical spinal joint dysfunction at one or more sites. A range of computer-based tasks was used to determine simple reaction time (RT), choice RT, probe RT, and inhibition of a preplanned response.
Results
Multiple sites of cervical spinal joint dysfunction were related to impaired cortical processing as revealed by significantly higher loads on central capacity, significantly less accurate response selection, and a trend toward more variable performance of an anticipated response. Multiple sites of cervical spinal joint dysfunction do not appear to be related to the speed of response selection or the ability to inhibit a preplanned response.
Conclusion
This pilot study provides a context for the improvements in cortical processing observed after cervical spine adjustment. It shows that probe RT may be a useful tool in further studies examining the effects of cervical spine manipulation of joint dysfunction and the associated effect on cognitive function.
aPostgraduate Student, New Zealand College of Chiropractic, Auckland, New Zealand
bResearch Fellow, Human Motor Control Laboratory, Department of Sport & Exercise Science, University of Auckland, New Zealand
cPostgraduate Student, New Zealand College of Chiropractic, Auckland, New Zealand
Submit requests for reprints to: Cathy M. Stinear, BSc (Chiro) Human Motor Control Laboratory, Department of Sport and Exercise Science, University of Auckland, Private Bag 92109, Auckland, New Zealand
Sources of support: No external funds were declared for the preparation of this research.
ABSTRACT