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Loss of capacity to recover from acidosis in repeat exercise is strongly associated with fatigue in primary biliary cirrhosis

Lookup NU author(s): Dr Kieren Hollingsworth, Emerita Professor Julia Newton, Professor Roy Taylor, Professor Andrew BlamireORCiD, Professor David Jones


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Background & Aims: Upon exercise, primary biliary cirrhosis (PBC) is associated with significant acidosis in peripheral muscle with recovery rate from acidosis strongly associating with fatigue. PBC patients describe particular problems with repeat exercise describing subsequent exercise episodes being limited by perceived effects of the first. We modelled this effect by exploring kinetics of pH recovery during 3 linked exercise episodes using magnetic resonance spectroscopy (MRS). Methods: Muscle acid handling capacity was studied following 3 x 3 min exercise periods at 35% maximum voluntary capacity in matched fatigued PBC, non-fatigued PBC and healthy controls (n = 8 per group). Results: Time to pH recovery following initial exercise was prolonged in PBC compared to controls (160 s [60-390] vs. 25 101801, p = 0.005) with the longest recovery time seen in fatigued patients (median 210 s). All subjects shortened recovery time between exercise periods 1-2 (controls: mean 28%, non-fatigued PBC patients: 29% and fatigued PBC patients: 30%. Normals showed further recovery shortening between exercise periods 2-3 (-18%, p = ns vs. period 1-2 recovery) however this adaptive response was lost in non-fatigued PBC patients (+3%) and reversed in fatigued patients (+19%, p = 0.01 vs. period 1-2). Conclusions: PBC patients retain the physiological capacity to shorten pH recovery time following repeat exercise. Capacity to shorten recovery time after a 2nd exercise period is lost in low-fatigue PBC patients and replaced by recovery prolongation in fatigued patients. Improvement in post-exercise acid recovery through exercise therapy should be possible in PBC patients and could be a novel approach to peripheral fatigue treatment. (C) 2010 Published by Elsevier B.V. on behalf of the European Association for the Study of the Liver.

Publication metadata

Author(s): Hollingsworth KG, Newton JL, Robinson L, Taylor R, Blamire AM, Jones DEJ

Publication type: Article

Publication status: Published

Journal: Journal of Hepatology

Year: 2010

Volume: 53

Issue: 1

Pages: 155-161

Print publication date: 01/07/2010

ISSN (print): 0168-8278

ISSN (electronic): 1600-0641

Publisher: Elsevier BV


DOI: 10.1016/j.jhep.2010.02.022


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Funder referenceFunder name
Medical Research Council
G0500020Medical Research Council