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BioMed Research International
Volume 2014, Article ID 187324, 11 pages
http://dx.doi.org/10.1155/2014/187324
Research Article

High-Intensity Strength Training Improves Function of Chronically Painful Muscles: Case-Control and RCT Studies

1National Research Centre for the Working Environment, Lersø Parkalle 105, 2100 Copenhagen, Denmark
2Section of Clinical Physiology and Nuclear Medicine, Department of Diagnostics, Glostrup Hospital, University of Copenhagen, 2600 Glostrup, Denmark
3Institute of Sport Science and Clinical Biomechanics, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark
4Copenhagen Muscle Research Centre, University of Copenhagen, 2100 Copenhagen, Denmark

Received 9 November 2013; Revised 2 January 2014; Accepted 5 January 2014; Published 23 February 2014

Academic Editor: David G. Behm

Copyright © 2014 Lars L. Andersen et al. 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.

Abstract

Aim. This study investigates consequences of chronic neck pain on muscle function and the rehabilitating effects of contrasting interventions. Methods. Women with trapezius myalgia (MYA, ) and healthy controls (CON, ) participated in a case-control study. Subsequently MYA were randomized to 10 weeks of specific strength training (SST, ), general fitness training (GFT, ), or a reference group without physical training (REF, ). Participants performed tests of 100 consecutive cycles of 2 s isometric maximal voluntary contractions (MVC) of shoulder elevation followed by 2 s relaxation at baseline and 10-week follow-up. Results. In the case-control study, peak force, rate of force development, and rate of force relaxation as well as EMG amplitude were lower in MYA than CON throughout all 100 MVC. Muscle fiber capillarization was not significantly different between MYA and CON. In the intervention study, SST improved all force parameters significantly more than the two other groups, to levels comparable to that of CON. This was seen along with muscle fiber hypertrophy and increased capillarization. Conclusion. Women with trapezius myalgia have lower strength capacity during repetitive MVC of the trapezius muscle than healthy controls. High-intensity strength training effectively improves strength capacity during repetitive MVC of the painful trapezius muscle.