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

  [ 5 votes ]   [ 3 Comments ]
By K. Ickmans et al. • www.ProHealth.com • December 21, 2013


By K. Ickmans et al.

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 < 0•05).

CONCLUSIONS: This 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.

© 2013 Stichting European Society for Clinical Investigation Journal Foundation. Published by John Wiley & Sons Ltd.

Source: Ickmans K,, Meeus M, De Kooning M, Lambrecht L, Nijs J., Pain in Motion Research Group, Department of Human Physiology and Physiotherapy, Faculty of Physical Education & Physiotherapy, Vrije Universiteit Brussel, Brussel, Belgium; Pain in Motion Research Group, Division of Musculoskeletal Physiotherapy, Department of Health Care Sciences, Artesis University College Antwerp, Antwerp, Belgium; Pain in Motion Research Group, Department of Physical Medicine and Physiotherapy, University Hospital Brussels, Brussels, Belgium. Recovery of upper limb muscle function in chronic fatigue syndrome with and without fibromyalgia. Eur J Clin Invest: 10.1111/eci.12201. [Epub ahead of print]. 




Please Discuss This Article:   Post a Comment 

This could be a good study
Posted by: IanH
Dec 21, 2013
I am awaiting the full report. This study is important as it separates two groups out biochemically based on self report. It also confirms what I have said for years that ME/CFS and FM are not different diseases but that the FM is a symptom of ME/CFS in some people genetically predisposed or traumatically predisposed (mainly spinal stenosis).

It may also tell something of the difference between the fatigue components, Some people having delayed muscle fibre recovery due to muscular mitochondrial dysfunction and accumulated lactic acid(the FM group) and those with centrally mediated fatigue which may be everyone with ME/CFS or another subset with ME/CFS.

Of course, notwithstanding those with "FM" who do not have fatigue (PEM) symptoms.
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Having now read the paper
Posted by: IanH
Dec 21, 2013
I see one key factor. The tested recovery time was initiated approximately one hour after the stress test. It is well known that in people with ME/CFS the worst effect of an exertion is felt on the second day. Can this muscular exertion can be compared with "body-wide" exertion? probably not. Body-wide exertion involves significant cardio-vascular changes which may account for P.E.M. So that people with ME/CFS (no FM) may recover quickly from a muscle stress test in the short term. Whether they suffer any kind of P.E.M many hours later (2 days) was not tested. Whereas the people with ME/CFS (+FM) recover slowly in the short term.

This is consistent with what we see clinically. People with FM suffer a lot of pain after muscle exertion and the muscular recovery time is slower than "normals". We have also found that resting muscle tension (fibre length) in FM is higher (fibres shorter) so that when they use the muscles concerned they are already more fatigued. I don't have enough data to comment on people with ME/CFS without FM.

So this is really a study of muscle recovery in FM. Even though this involves some exertion of the limb it is not exertion of the "whole body". This may produce different results too.

The authors also mention

 


Upper Limb Study
Posted by: caledonia
Dec 26, 2013
I think the study was too small, and/or not designed to take PEM into account, and these differences would disappear in a larger or better designed study. I have ME/CFS only, yet I also have slower recovery in my upper limb muscles.
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