ISSN: 2544-4395
Physiotherapy Quarterly
Current issue Archive Manuscripts accepted About the journal Editorial board Instructions for Reviewers Journal's Reviewers Special information Abstracting and indexing Contact Instructions for authors
SCImago Journal & Country Rank
2/2020
vol. 28
 
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abstract:
Original paper

Effects of ascending and descending direct current on grip strength assessed through dynamometry and myofeedback: a randomized controlled trial

Hernán Andrés de la Barra Ortiz
1
,
Jaime Opazo Cancino
2
,
Nicole Minzer Goluboff
1
,
Ghyslaing Andrade Obando
1
,
Macarena Herrera Jara
1
,
María Fernanda González Vera
1

1.
Universidad Andres Bello, Santiago, Chile
2.
Universidad Diego Portales, Santiago, Chile
Online publish date: 2020/05/04
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Introduction
To investigate effects of ascending and descending direct current (ADC and DDC) on muscle strength evaluated with dynamometry. Muscle strength values in kilograms were compared in 3 groups (ADC, DDC, and control) before and after galvanic electrical intervention.

Methods
A randomized clinical trial was performed in the Physiotherapy Laboratory of Andrés Bello University among 83 healthy volunteers. The intervention was a direct current session at an intensity of 4 mA for 12 minutes with 48-cm2 electrodes (dose: 48 mA · min; current density: 0.04 mA/cm2). The difference between the groups was galvanic therapy type applied. Current application followed a hand dynamometric test and myofeedback evaluation. The main outcome was maximum strength difference (MSdif) and its corresponding value in microvolts (μV-MSdif) obtained with myofeedback.

Results
There were statistically significant changes regarding MSdif in groups who received direct current (p = 0.0001). These variations were also seen when comparing the 3 groups with the consideration of men (p = 0.0012) and women (p = 0.0021) separately. No statistically significant changes were observed in the μV-MSdif values (p = 0.9409).

Conclusions
ADC can generate variations in grip strength after an intervention session, with an increase in strength of 8.9%. The increase in strength was observed both in men (6.7%) and in women (9%) of the ADC group.

keywords:

randomized controlled trial, hand strength, handheld dynamometry, electrical stimulation therapy, transcutaneous electric nerve stimulation

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