Effect of rectangular and exponentially climbing waveforms on knee extension torque during neuromuscular electrical stimulation

Genichi Tanino, Yutaka Tomita, Abbas Orand, Kotaro Takeda, Ken Tomida, Hiroyuki Miyasaka, Kensuke Ohno, Sayaka Okamoto, Shigeru Sonoda

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

BACKGROUND: Electrical stimulation is shown to be effective for the amelioration of paralysis. The stimulation pattern can have a direct relation to injected charge in the stimulated area resulting in a wider area stimulation and consequently better recovery. OBJECTIVE: In this study, we investigated the effect of two electrical stimulation waveforms, rectangular and exponentially climbing. Three parameters of current, voltage, and knee extension torque of the 2 waveforms were recorded and used for the comparison of the two waveforms. METHODS: Fifteen male and 15 female able-bodied subjects (age: 25.0 ± 3.2) were recruited. Electrical stimulation was applied to right quadriceps muscles. At the maximum tolerable intensity, the 3 parameters were recorded for each of the 2 waveforms. Using the recorded knee extension torques, the adjusted maximum electrically induced contraction to voluntary torques in percent (%MEIC) of the two waveforms were calculated. Together with the other two parameters, current and voltage, the 2 waveforms were compared. RESULTS: The %MEIC and maximum voltage were significantly higher with the exponentially climbing waveform than with the rectangular waveform (%MEIC:p <0.05, max voltage:p <0.01). The maximum current did not differ significantly between conditions. CONCLUSION: These results indicate that an exponentially climbing waveform may induce stronger torque than a rectangular waveform and might thus be useful when applying NMES in clinical situations.

Original languageEnglish
Pages (from-to)139-144
Number of pages6
JournalTechnology and Disability
Volume28
Issue number4
DOIs
Publication statusPublished - 01-01-2017

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Torque
Electric Stimulation
Knee
Quadriceps Muscle
Paralysis

All Science Journal Classification (ASJC) codes

  • Rehabilitation
  • Health Informatics

Cite this

Tanino, Genichi ; Tomita, Yutaka ; Orand, Abbas ; Takeda, Kotaro ; Tomida, Ken ; Miyasaka, Hiroyuki ; Ohno, Kensuke ; Okamoto, Sayaka ; Sonoda, Shigeru. / Effect of rectangular and exponentially climbing waveforms on knee extension torque during neuromuscular electrical stimulation. In: Technology and Disability. 2017 ; Vol. 28, No. 4. pp. 139-144.
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abstract = "BACKGROUND: Electrical stimulation is shown to be effective for the amelioration of paralysis. The stimulation pattern can have a direct relation to injected charge in the stimulated area resulting in a wider area stimulation and consequently better recovery. OBJECTIVE: In this study, we investigated the effect of two electrical stimulation waveforms, rectangular and exponentially climbing. Three parameters of current, voltage, and knee extension torque of the 2 waveforms were recorded and used for the comparison of the two waveforms. METHODS: Fifteen male and 15 female able-bodied subjects (age: 25.0 ± 3.2) were recruited. Electrical stimulation was applied to right quadriceps muscles. At the maximum tolerable intensity, the 3 parameters were recorded for each of the 2 waveforms. Using the recorded knee extension torques, the adjusted maximum electrically induced contraction to voluntary torques in percent ({\%}MEIC) of the two waveforms were calculated. Together with the other two parameters, current and voltage, the 2 waveforms were compared. RESULTS: The {\%}MEIC and maximum voltage were significantly higher with the exponentially climbing waveform than with the rectangular waveform ({\%}MEIC:p <0.05, max voltage:p <0.01). The maximum current did not differ significantly between conditions. CONCLUSION: These results indicate that an exponentially climbing waveform may induce stronger torque than a rectangular waveform and might thus be useful when applying NMES in clinical situations.",
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Effect of rectangular and exponentially climbing waveforms on knee extension torque during neuromuscular electrical stimulation. / Tanino, Genichi; Tomita, Yutaka; Orand, Abbas; Takeda, Kotaro; Tomida, Ken; Miyasaka, Hiroyuki; Ohno, Kensuke; Okamoto, Sayaka; Sonoda, Shigeru.

In: Technology and Disability, Vol. 28, No. 4, 01.01.2017, p. 139-144.

Research output: Contribution to journalArticle

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AU - Tanino, Genichi

AU - Tomita, Yutaka

AU - Orand, Abbas

AU - Takeda, Kotaro

AU - Tomida, Ken

AU - Miyasaka, Hiroyuki

AU - Ohno, Kensuke

AU - Okamoto, Sayaka

AU - Sonoda, Shigeru

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N2 - BACKGROUND: Electrical stimulation is shown to be effective for the amelioration of paralysis. The stimulation pattern can have a direct relation to injected charge in the stimulated area resulting in a wider area stimulation and consequently better recovery. OBJECTIVE: In this study, we investigated the effect of two electrical stimulation waveforms, rectangular and exponentially climbing. Three parameters of current, voltage, and knee extension torque of the 2 waveforms were recorded and used for the comparison of the two waveforms. METHODS: Fifteen male and 15 female able-bodied subjects (age: 25.0 ± 3.2) were recruited. Electrical stimulation was applied to right quadriceps muscles. At the maximum tolerable intensity, the 3 parameters were recorded for each of the 2 waveforms. Using the recorded knee extension torques, the adjusted maximum electrically induced contraction to voluntary torques in percent (%MEIC) of the two waveforms were calculated. Together with the other two parameters, current and voltage, the 2 waveforms were compared. RESULTS: The %MEIC and maximum voltage were significantly higher with the exponentially climbing waveform than with the rectangular waveform (%MEIC:p <0.05, max voltage:p <0.01). The maximum current did not differ significantly between conditions. CONCLUSION: These results indicate that an exponentially climbing waveform may induce stronger torque than a rectangular waveform and might thus be useful when applying NMES in clinical situations.

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