Butugan, Marco K.
Sartor, Cristina D.
Martins, Maria Cecilia S.
Ortega, Neli R. S.
Vigneron, Vincent A. M.
Sacco, Isabel C. N.
Total Authors: 7
 Univ Sao Paulo, Sch Med, Phys Therapy Speech & Occupat Therapy Dept, BR-05360160 Sao Paulo - Brazil
 Univ Sao Paulo, Sch Med, Ctr Fuzzy Syst Hlth, Sao Paulo - Brazil
 Univ Evry, Dept Elect Engn, Evry - France
Total Affiliations: 3
JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY;
Web of Science Citations:
This study compares muscle fiber conduction velocities estimated using surface electromyography during isometric maximal voluntary contraction in different stages of diabetic neuropathy. Eighty-five adults were studied: 16 non-diabetic individuals and 69 diabetic patients classified into four neuropathy stages, defined by a fuzzy expert system: absent (n = 26), mild (n = 21), moderate (n = 11) and severe (n = 11). Average muscle fiber conduction velocities of gastrocnemius medialis, tibialis anterior, vastus lateralis and biceps femoris were assessed using linear array electrodes, and were compared by ANOVA. Conduction velocities were significantly decreased in the moderate neuropathy group for the vastus lateralis compared to other groups (from 18% to 21% decrease), and were also decreased in all diabetic groups for the tibialis anterior (from 15% to 20% from control group). Not only the distal anatomical localization of the muscle affects the conduction velocity, but also the proportion of muscle fiber type, where the tibialis anterior with greater type I fiber proportion is affected earlier while the vastus lateralis with greater type II fiber proportion is affected in later stages of the disease. Generally, the muscles of the lower limb have different responsiveness to the effects of diabetes mellitus and show a reduction in the conduction velocity as neuropathy progresses. (C) 2014 Elsevier Ltd. All rights reserved. (AU)