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Experimental evaluation reveals impaired muscle relaxation during short pauses between dynamic contractions in primary fibromyalgia, indicating compromised mechanical performance.
Dynamic contractions can be studied during highly standardized circumstances by using isokinetic dynamometers. In one such study, in which such a dynamometer was used, we have shown recently that an inability to relax during supposed passive pauses had a negative influence on the mechanical performance during 150 repeated shoulder flexions
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Elert et al. (1989) studied this question.
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