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| Titel
| Andersen LL, Andersen JL, Suetta C, et al. Effect of contrasting physical exercise interventions on rapid force capacity of chronically painful muscles. Journal of Applied Physiology 2009;107(5):1413-9.
| | Udgivet
| 2009
| | Type
| Artikel i peer reviewed tidsskrift
| | Abstract
| Rapid force capacity of chronically painful muscles is inhibitedmarkedly more than maximal force capacity and is therefore relevantto assess in rehabilitation settings. Our objective was to investigatethe effect of two contrasting types of physical exercise onrapid force capacity, as well as neural and muscular adaptationsin women with chronic neck muscle pain. A group of employedwomen (n = 42) with a clinical diagnosis of trapezius myalgiaparticipated in a 10-wk randomized controlled trial; specificstrength training of the neck/shoulder muscles, general fitnesstraining performed as leg-bicycling; or a reference interventionwithout physical activity. Maximal voluntary shoulder abductionswere performed at static angles of 35° and 115° withsimultaneous recording of electromyography (EMG) in the trapeziusand deltoid. Maximal muscle strength and activation (peak torqueand peak EMG) as well as rapid muscle strength and activation[rate of torque development (RTD) and rate of EMG rise] weresubsequently determined. Trapezius muscle fiber characteristicswere determined with ATPase histochemistry. Significant changeswere observed only in the specific strength training group.Whereas peak torque increased 18-29% (P < 0.01), RTDincreased 61-115% (P < 0.001). Peak EMG and rate ofEMG rise increased correspondingly (P < 0.05-0.001),and trapezius type II muscle fibers hypertrophied 20% (P <0.001). In conclusion, rapid force capacity of chronically painfulmuscles is highly responsive to rehabilitation with specificstrength training. The underlying mechanisms were related toboth pain reduction and general neuromuscular adaptations tostrength training. Potentially, the present method can be auseful clinical screening tool of muscle function in rehabilitationsettings.
| | URL
| http://dx.doi.org/10.1152/japplphysiol.00555.2009
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