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BioMed Research International - Volume 2017 2017, Article ID 8985398, 6 pages -

Research Article

Physical Therapy and Rehabilitation Science Programs, Department of Physical Medicine and Rehabilitation, University of Colorado Anschutz Medical Campus, Aurora, CO, USA

Departments of Radiology and Orthopedic Surgery, University of California San Diego, San Diego, CA, USA

Physical Therapy Program, School of Exercise and Nutritional Sciences, San Diego State University, San Diego, CA, USA

Correspondence should be addressed to Katrina S. Maluf

Received 9 December 2016; Revised 25 February 2017; Accepted 27 March 2017; Published 6 April 2017

Academic Editor: Li-Wei Chou

Copyright © 2017 Bahar Shahidi and Katrina S. Maluf. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Numerous studies demonstrate elevated pain sensitivity and impaired conditioned pain modulation CPM in patients with chronic musculoskeletal pain compared to healthy individuals; however, the time course of changes in pain sensitivity and CPM after the development of a chronic pain condition is unclear. Secondary analysis of data from a prospective investigation examined changes in evoked pain sensitivity and CPM before and after development of chronic neck pain CNP. 171 healthy office workers participated in a baseline assessment, followed by monthly online questionnaires to identify those who developed CNP over the subsequent year. These individuals and a cohort of participants who remained pain-free during the follow-up period returned for a 12-month follow-up assessment of mechanical and thermal pain sensitivity and CPM. Pain sensitivity measures did not differ between groups at baseline; however, cold pain threshold decreased in the CNP group at follow-up . CPM was lower at baseline in the CNP group compared to those who reported no neck pain and remained unchanged one year later. These findings indicate that CPM is reduced in healthy individuals prior to the development of chronic neck pain and the subsequent reduction of thresholds for cold but not pressure pain.

Autor: Bahar Shahidi and Katrina S. Maluf



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