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, Jaime Opazo Cancino, Nicole Minzer Goluboff, Ghyslaing Andrade Obando, Macarena Herrera Jara, María Fernanda González Vera

Research output: Contribution to journalArticlepeer-review

Abstract

Introduction. To investigate effects of ascending and descending direct current (ADC and DD C) on muscle strength evaluated with dynamometry. Muscle strength values in kilograms were compared in 3 groups (ADC, DD C, and control) before and after galvanic electrical intervention. Methods. A randomized clinical trial was performed in the Physiotherapy Laboratory of Andres 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.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalPhysiotherapy Quarterly
Volume28
Issue number2
DOIs
Publication statusPublished - 2020

Keywords

  • Electrical stimulation therapy
  • Hand strength
  • Handheld dynamometry
  • Randomized controlled trial
  • Transcutaneous electric nerve stimulation

ASJC Scopus subject areas

  • Physical Therapy, Sports Therapy and Rehabilitation

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