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Type: Artigo de periódico
Title: Changes in types of muscle fibers induced by transcutaneous electrical stimulation of the diaphragm of rats
Author: Costa, D
Cancelliero, KM
Campos, GER
Salvini, TF
da Silva, CA
Abstract: The objective of the present study was to assess the effect of transcutaneous electrical diaphragmatic stimulation (TEDS) on different types of diaphragm muscle fibers. Male Wistar rats (8-12 weeks old) were divided into 2 experimental groups (N = 8 in each group): 1) control, 2) animals submitted to TEDS [frequency = 50 Hz; T-ON/T-OFF (contraction/relaxation time) = 2/2 s; pulse duration = 0.4 ms, intensity = 5 mA with a 1 mA increase every 3 min for 20 min] for 7 days. After completing this treatment period, the I, IIA, IIB, and IID diaphragm muscle fibers were identified using the mATPase technique. Statistical analysis consisted of the normality, homoscedasticity and t-tests (P < 0.05). There was a 19.6% (P < 0.05) reduction in the number of type I fibers and a 49.7% increase (P < 0.05) in type IID fibers in the TEDS group compared with the control group. An important result of the present study was that electrical stimulation with surface electrodes was efficient in altering the distribution of fibers in diaphragm muscle. This therapeutic resource could be used in the treatment of respiratory muscle alterations.
Subject: diaphragm
transcutaneous electrical stimulation
muscle fiber
Country: Brasil
Editor: Assoc Bras Divulg Cientifica
Citation: Brazilian Journal Of Medical And Biological Research. Assoc Bras Divulg Cientifica, v. 41, n. 9, n. 809, n. 811, 2008.
Rights: aberto
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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