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Lactate production upon short-term non-ischemic forearm exercise in mitochondrial disorders and other myopathies.

Abstract：

BACKGROUND:The nonischemic forearm exercise test (NIFET) has been shown to be as effective as the classic ischemic forearm exercise test (IFET) in the diagnosis of patients with McArdle disease. Recently, the lactate increase normalized to the mechanical energy production in NIFET was suggested to have a intermediate sensitivity and satisfactory specifity for the screening of mitochondrial disorders. METHODS:NIFET at 80% maximal contraction force (MCF) was performed in normal controls (n = 41), patients with mitochondrial disorders (n = 15) and other myopathies (diseased controls, n = 20). 26 healthy volunteers also underwent IFET at 80% MCF. The ratio of lactate increase and workload was defined as specific lactate production (mmol x s/N x l). RESULTS:In normal controls there was no significant different lactate increase during NIFET and IFET. The workload performed showed only a weak significant positive correlation with the lactate increase in the NIFET in normal controls (r(2) = 0.20) but not in IFET and NIFET with patients. A moderate negative correlation of specific lactate production and the absolute workload was found in all groups and in both protocols (r(2) = 0.22-0.34). The specific lactate production was highest in patients with other myopathies, intermediate in patients with mitochondrial disorders and lowest in normal controls. NIFET showed a sensitivity of only 20 % and a specifity of 95% for normal controls, but only 75 % for diseased controls. CONCLUSION:The specific lactate production during NIFET is neither sufficiently specific nor sensitive for the diagnosis of mitochondrial disorders. Increased specific lactate production during rest-to-work transition period might be caused by increased acetyl group deficits.

journal_name

J Neurol

journal_title

Journal of neurology

authors

Hanisch F,Eger K,Bork S,Lehnich H,Deschauer M,Zierz S

doi

10.1007/s00415-006-0101-7

subject

Has Abstract

pub_date

2006-06-01 00:00:00

pages

735-40

issue

6

eissn

0340-5354

issn

1432-1459

journal_volume

253

pub_type

临床试验,杂志文章

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