Impact of Varying the Parameters of Stimulation of 2 Commonly Used Waveforms on Muscle Force Production and Fatigue

Lein, Donald H.; Myers, Christina A; Bickel, C. Scott

doi:10.2519/jospt.2015.5574

Cited by 7 publications

(3 citation statements)

References 28 publications

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“…However, effects estimates were highly heterogeneous among studies ( I 2 = 66%; P = 0.002). Excluding 3 [ 9 , 35 , 39 ] studies with imputed data led to a significantly lower %MVIC in KFAC than those in PC (pooled SMD: -0.45; 95% CI: -0.75, -0.16; P = 0.002). Posthoc sensitivity analysis revealed that KFAC had significantly lower torque than PC when 1 article targeting the wrist extensor muscle[ 38 ] was excluded from the meta-analysis (pooled SMD: -0.41; 95% CI: -0.81, -0.01; P = 0.040).…”

Section: Resultsmentioning

confidence: 99%

“…A difference between PC and KFAC in the %MVIC (n = 196),[ 9 , 13 , 34 – 36 , 38 – 41 , 44 ] and muscle-evoked torque (n = 65)[ 34 , 37 , 42 , 43 ] was observed in 10 and 4 articles, respectively. In 3 [ 9 , 35 , 39 ] and 2 [ 34 , 43 ] studies, missing data were imputed from available data to estimate pooled SMD for %MVIC and muscle torque, respectively. Considering all studies, the pooled SMD on the muscle performance was calculated ( Fig 2 ).…”

Section: Resultsmentioning

confidence: 99%

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Comparison of the effects of kilohertz- and low-frequency electric stimulations: A systematic review with meta-analysis

et al. 2018

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ObjectiveThis study aimed to determine whether kilohertz-frequency alternating current (KFAC) is superior to low-frequency pulsed current (PC) in increasing muscle-evoked torque and lessening discomfort.Data sourcesThe electronic databases PubMed, PEDro, CINAHL, and CENTRAL were searched for related articles, published before August 2017. Furthermore, citation search was performed on the original record using Web of Science.Review methodsRandomized controlled trials, quasi-experimental studies, and within-subject repeated studies evaluating and comparing KFAC and PC treatments were included. The pooled standardized mean differences (SMDs) of KFAC and PC treatments, with 95% confidence intervals (CIs), were calculated using the random effects model.ResultsIn total, 1148 potentially relevant articles were selected, of which 14 articles with within-subject repeated designs (271 participants, mean age: 26.4 years) met the inclusion criteria. KFAC did not significantly increase muscle-evoked torque, compared to PC (pooled SMD: -0.25; 95% CI: -0.53, 0.06; P = 0.120). KFAC had comparable discomfort compared to that experienced using PC (pooled SMD: -0.06; 95% CI: -0.50, 0.38; P = 0.800). These estimates of the effects had a high risk of bias, as assessed using the Downs and Black scale, and were highly heterogeneous studies.ConclusionsThis meta-analysis does not establish that KFAC is superior to PC in increasing muscle-evoked torque and lessening discomfort level. However, no strong conclusion could be drawn because of a high risk of bias and a large amount of heterogeneity. High quality studies comparing the efficacy between PC and KFAC treatments with consideration of potential confounders is warranted to facilitate the development of effective treatment.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Comparison of the effects of kilohertz- and low-frequency electric stimulations: A systematic review with meta-analysis

et al. 2018

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“…Carrier frequency was set at 2500 Hz, pulse time being 200 milliseconds and burst frequency of 50Hz with on time of 2 second followed by an off interval of 2 seconds, resulting in a 50% duty cycle as fixed parameter, which automatically adjust the expert modes: ON2 mode consists of two intervals: the stimulus applied as preset on the device with amplitude incrementally increased with the purpose of reaching the participants’ maximum tolerance 7/10 followed by a two second off period and then another ON2 stimulus with a frequency of 50 Hz and 100% amplitude then the Rest mode, which also consisted of two intervals: the stimulus applied as preset on the device, then followed by a continuous Rest stimulus that has a frequency of 4 Hz and 70% amplitude. Two channels were used for delivering the electrical stimulus, with four rectangular cutaneous electrodes (6×8 cm diameter) positioned on the anterior surface of the thigh, targeting the motor points of both vastus medialis and rectus femoris following a previous study done by Dantas et al [ 25 – 27 ].…”

Section: Methodsmentioning

confidence: 99%

Effect of Russian current expert modes on quadriceps muscle torque in healthy adults: A single-blinded randomized controlled trial

Hasan,

Moustafa,

Shousha

2024

PLoS ONE

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Background Russian current (RC), a well-known neuromuscular electrical stimulation operating at 2500 Hz, has demonstrated significant strength improvement over traditional exercises due to its high tolerance and low pain provocation. Despite extensive NMES parameter research, the specific effects of expert modes, particularly ON2 and Rest, remain unexplored. This study investigates the direct effect of these expert modes on quadriceps muscle strength in healthy adults. Methods This is a single-blind, randomization-controlled trial. Forty-eight healthy university students (31 females, 17 males) were assigned in two randomized experimental groups either the ON2 or Rest mode for a 15-minute electrical stimulation session. Quadriceps maximum voluntary isokinetic contraction measurements were taken before and directly after RC application using Biodex Medical Systems 4 pro isokinetic dynamometer. Results Both RC modes significantly increased the quadriceps muscle torque in healthy adults compared to baseline (p<0.05). Baseline mean torque was 123.28 (SD = 38.8), and post- RC mean torque was 136.67 (SD = 45.76). Deviation from normality was observed at baseline (p = 0.034) and persisted post-RC application (p = 0.017). The Wilcoxon test reported significant increases in quadriceps muscle knee torque for both ON2 and Rest groups (p < 0.001). The lack of ties in ranks and negative Z-values highlight the robustness of the observed effects. Conclusion The findings of this study align with previous research on NMES and RC supporting the idea that electrical stimulation enhances muscle strength, selecting the appropriate RC expert modes can assist physiotherapist in tailoring rehabilitation program to achieve their specific strength goals.

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Aussie current and quadriceps muscle endurance: a randomized clinical trial

Carvalho

Reginato

et al. 2022

Sport Sci Health

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Impact of Varying the Parameters of Stimulation of 2 Commonly Used Waveforms on Muscle Force Production and Fatigue

Cited by 7 publications

References 28 publications

Comparison of the effects of kilohertz- and low-frequency electric stimulations: A systematic review with meta-analysis

Comparison of the effects of kilohertz- and low-frequency electric stimulations: A systematic review with meta-analysis

Effect of Russian current expert modes on quadriceps muscle torque in healthy adults: A single-blinded randomized controlled trial

Aussie current and quadriceps muscle endurance: a randomized clinical trial

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