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Force decline of quadriceps femoris muscle during repetitive magnetic stimulation of femoral nerve in control subjects and COPD patients. The curves were significantly different at 10, 20, 30, and 40 trains Copyright © 2007. Adapted from Swallow EB, Gosker HR, Ward KA, et al 2007a. A novel technique for nonvolitional assessment of quadriceps muscle endurance in humans. J Appl Physiol, 103:739–46.
Abbreviation: COPD, chronic obstructive pulmonary disease.
