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Nonvolitional assessment of muscle endurance in idiopathic inflammatory myopathies: There is no relationship between patient‐reported fatigue and muscle fatigability
Author(s) -
Campbell Richard,
Gordon Patrick,
Ward Katie,
Reilly Charles,
Scott David L.,
Rafferty Gerrard F.
Publication year - 2014
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/mus.24148
Subject(s) - medicine , muscle fatigue , physical medicine and rehabilitation , physical therapy , electromyography
: We investigated whether muscle endurance differs between IIM patients and controls and if a relationship exists between perceived fatigue and poor muscle endurance. Methods : Quadriceps contractility, measured using femoral nerve stimulation (TwQ), and strength, measured using maximal voluntary contraction (MVCQ), were assessed in 20 IIM patients and matched controls. Quadriceps endurance was assessed using repetitive electrical stimulation (3 minutes). Time for force to fall to 70% initial force was determined (T70). Reported fatigue was measured using the FACIT‐F/Fatigue Severity Scales. Results : TwQ and MVCQ were lower and perceived fatigue greater for patients. There was no difference in T70 between groups. No relationships were observed between perceived fatigue and endurance (T70). Conclusions : IIM patients reported more fatigue and were weaker than controls, but there was no difference in muscle endurance. Endurance and strength were unrelated to reported fatigue measures. Mechanisms driving perceived IIM fatigue are likely to be multifactorial. Muscle Nerve 50 : 401–406, 2014