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Recovery of upper limb muscle function in chronic fatigue syndrome with and without fibromyalgia

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Abstract
Background: Chronic fatigue syndrome (CFS) patients frequently complain of muscle fatigue and abnormally slow recovery, especially of the upper limb muscles during and after activities of daily living. Furthermore, disease heterogeneity has not yet been studied in relation to recovery of muscle function in CFS. Here, we examine recovery of upper limb muscle function from a fatiguing exercise in CFS patients with (CFS+FM) and without (CFS-only) comorbid fibromyalgia and compare their results with a matched inactive control group. Design: In this case-control study, 18 CFS-only patients, 30 CFS+FM patients and 30 healthy inactive controls performed a fatiguing upper limb exercise test with subsequent recovery measures. Results: There was no significant difference among the three groups for maximal handgrip strength of the non-dominant hand. A significant worse recovery of upper limb muscle function was found in the CFS+FM, but not in de CFS-only group compared with the controls (P<005). Conclusions: his study reveals, for the first time, delayed recovery of upper limb muscle function in CFS+FM, but not in CFS-only patients. The results underline that CFS is a heterogeneous disorder suggesting that reducing the heterogeneity of the disorder in future research is important to make progress towards a better understanding and uncovering of mechanisms regarding the nature of divers impairments in these patients.
Keywords
handgrip strength, Chronic fatigue syndrome, maximal voluntary contraction, muscle fatigue, muscle recovery, MAGNETIC-RESONANCE-SPECTROSCOPY, LOW-BACK-PAIN, EXERCISE, PERFORMANCE, STRENGTH, FATIGUABILITY, DEFINITION, METABOLISM, WOMEN, FEAR

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MLA
Ickmans, Kelly, Mira Meeus, Margot De Kooning, et al. “Recovery of Upper Limb Muscle Function in Chronic Fatigue Syndrome with and Without Fibromyalgia.” EUROPEAN JOURNAL OF CLINICAL INVESTIGATION 44.2 (2014): 153–159. Print.
APA
Ickmans, K., Meeus, M., De Kooning, M., Lambrecht, L., & Nijs, J. (2014). Recovery of upper limb muscle function in chronic fatigue syndrome with and without fibromyalgia. EUROPEAN JOURNAL OF CLINICAL INVESTIGATION, 44(2), 153–159.
Chicago author-date
Ickmans, Kelly, Mira Meeus, Margot De Kooning, Luc Lambrecht, and Jo Nijs. 2014. “Recovery of Upper Limb Muscle Function in Chronic Fatigue Syndrome with and Without Fibromyalgia.” European Journal of Clinical Investigation 44 (2): 153–159.
Chicago author-date (all authors)
Ickmans, Kelly, Mira Meeus, Margot De Kooning, Luc Lambrecht, and Jo Nijs. 2014. “Recovery of Upper Limb Muscle Function in Chronic Fatigue Syndrome with and Without Fibromyalgia.” European Journal of Clinical Investigation 44 (2): 153–159.
Vancouver
1.
Ickmans K, Meeus M, De Kooning M, Lambrecht L, Nijs J. Recovery of upper limb muscle function in chronic fatigue syndrome with and without fibromyalgia. EUROPEAN JOURNAL OF CLINICAL INVESTIGATION. 2014;44(2):153–9.
IEEE
[1]
K. Ickmans, M. Meeus, M. De Kooning, L. Lambrecht, and J. Nijs, “Recovery of upper limb muscle function in chronic fatigue syndrome with and without fibromyalgia,” EUROPEAN JOURNAL OF CLINICAL INVESTIGATION, vol. 44, no. 2, pp. 153–159, 2014.
@article{4235137,
  abstract     = {Background: Chronic fatigue syndrome (CFS) patients frequently complain of muscle fatigue and abnormally slow recovery, especially of the upper limb muscles during and after activities of daily living. Furthermore, disease heterogeneity has not yet been studied in relation to recovery of muscle function in CFS. Here, we examine recovery of upper limb muscle function from a fatiguing exercise in CFS patients with (CFS+FM) and without (CFS-only) comorbid fibromyalgia and compare their results with a matched inactive control group. 
Design: In this case-control study, 18 CFS-only patients, 30 CFS+FM patients and 30 healthy inactive controls performed a fatiguing upper limb exercise test with subsequent recovery measures. 
Results: There was no significant difference among the three groups for maximal handgrip strength of the non-dominant hand. A significant worse recovery of upper limb muscle function was found in the CFS+FM, but not in de CFS-only group compared with the controls (P<005). 
Conclusions: his study reveals, for the first time, delayed recovery of upper limb muscle function in CFS+FM, but not in CFS-only patients. The results underline that CFS is a heterogeneous disorder suggesting that reducing the heterogeneity of the disorder in future research is important to make progress towards a better understanding and uncovering of mechanisms regarding the nature of divers impairments in these patients.},
  author       = {Ickmans, Kelly and Meeus, Mira and De Kooning, Margot and Lambrecht, Luc and Nijs, Jo},
  issn         = {0014-2972},
  journal      = {EUROPEAN JOURNAL OF CLINICAL INVESTIGATION},
  keywords     = {handgrip strength,Chronic fatigue syndrome,maximal voluntary contraction,muscle fatigue,muscle recovery,MAGNETIC-RESONANCE-SPECTROSCOPY,LOW-BACK-PAIN,EXERCISE,PERFORMANCE,STRENGTH,FATIGUABILITY,DEFINITION,METABOLISM,WOMEN,FEAR},
  language     = {eng},
  number       = {2},
  pages        = {153--159},
  title        = {Recovery of upper limb muscle function in chronic fatigue syndrome with and without fibromyalgia},
  url          = {http://dx.doi.org/10.1111/eci.12201},
  volume       = {44},
  year         = {2014},
}

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