Fatigue perceived by multiple sclerosis patients is associated with muscle fatigue.

Abstract:

BACKGROUND:Fatigue is a debilitating symptom in multiple sclerosis (MS). Previous studies showed no association between fatigue as perceived by the patient and physiological measures of fatigability. OBJECTIVE:The authors investigated associations between perceived fatigue and measures of fatigability after correction for differences in maximal voluntary contraction (MVC). METHODS:A total of 20 people with relapsing-remitting MS with an Extended Disability Severity Score less than 5.5 and 20 healthy controls filled out the Fatigue Severity Score questionnaire of perceived fatigue. The authors obtained the MVC from the first dorsal interosseus muscle, voluntary muscle activation, and force decline during a sustained MVC (124 s, muscle fatigue). RESULTS:Patients perceived increased levels of fatigue compared with controls (P < .001). Although patients and controls developed similar amounts of muscle fatigue during the sustained contraction, a linear regression model that included both muscle fatigue and MVC was positively associated with perceived fatigue in patients only (R (2) = 0.45; P = .01). Voluntary activation during the sustained contraction was negatively associated with perceived fatigue (R (2) = 0.25; P = .02). CONCLUSION:The data indicate that fatigue perceived by MS patients is associated with measures of fatigability. This observation helps in the understanding of mechanisms underlying the increased levels of fatigue perceived by MS patients. These data also emphasize that for comparison of fatigue-related parameters between groups, correction for individual maximal force is essential.

authors

Steens A,de Vries A,Hemmen J,Heersema T,Heerings M,Maurits N,Zijdewind I

doi

10.1177/1545968311416991

subject

Has Abstract

pub_date

2012-01-01 00:00:00

pages

48-57

issue

1

eissn

1545-9683

issn

1552-6844

pii

1545968311416991

journal_volume

26

pub_type

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