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Sense of effort during a fatiguing exercise protocol in Chronic Fatigue Syndrome

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Journal: Research in Sports Medicine. 2007 Jan-Mar;15(1):47-59

Authors and affiliations: Wallman KE, Sacco P. School of Human Movement & Exercise Science, The University of Western Australia, Crawley, Western Australia.

PMID: 17365951

The purpose of this study was to determine whether Chronic Fatigue Syndrome (CFS) subjects would produce greater force production in their matching limb during a fatiguing contralateral limb-matching task of the elbow flexors, compared with healthy, matched controls.

Eight CFS subjects and 8 healthy, matched control subjects participated in a fatiguing task that consisted of intermittent submaximal contractions (30% maximal voluntary contraction) of the nondominant arm performed over a 45 min duration.

Each minute, the subject attempted to match the force of the nondominant arm with their dominant arm (without visual feedback for the dominant arm). Results showed that average matching force and ratings of perceived effort values were significantly higher in the CFS group during the fatiguing task (P = 0.04, P = 0.02, respectively).

This study demonstrated objectively that CFS subjects experienced a greater sense of effort in the elbow flexors while performing a fatiguing task.

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