Validity of surface electromyography for vastus intermedius muscle assessed by needle electromyography

Watanabe, Kohei; Akima, Hiroshi

doi:10.1016/j.jneumeth.2011.03.014

Cited by 38 publications

(25 citation statements)

References 15 publications

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“…Based on this procedure, we clearly showed that the EMG activity of the VI muscle could be recorded with a negligible amount of cross‐talk from the adjacent VL muscle in our previous study, demonstrating significant MF decreases by selective cooling of the VL but no significant MF decreases without cooling of the VI during MVC 14. We also showed that the surface EMG signal of the VI muscle can be considered to represent global neuromuscular activation of the VI muscle in combination with needle EMG 18. These electrodes of 5 muscles were placed parallel to the estimated muscle fibers of muscles.…”

Section: Methodssupporting

confidence: 56%

“…For the VM, the electrode was placed slightly proximal and medial to the patella. For the VI muscle, we used the same procedure as used in our previous studies 14, 16–18. Briefly, we have previously confirmed the superficial region of the VI muscle at the lateral‐distal portion of the thigh in 45 healthy men tested using magnetic resonance imaging (also see Fig.…”

Section: Methodsmentioning

confidence: 96%

“…By combining magnetic resonance imaging and ultrasound techniques, we identified the region of the VI muscle that faces the skin surface (32 × 43 mm, anterior‐posterior by proximal‐distal) and successfully recorded the muscle activity of the VI from this region with a negligible amount of cross‐talk from the adjacent VL muscle by surface EMG during MVC 14–18. Using this innovative technique, the EMG activity of all 4 synergists of the QF muscle group can be recorded to accumulate scientific knowledge about the neuromuscular control of the 4 individual muscles in the QF during human movement.…”

mentioning

confidence: 99%

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Alternate muscle activity patterns among synergists of the quadriceps femoris including the vastus intermedius during low‐level sustained contraction in men

et al. 2012

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Section: Methodssupporting

confidence: 56%

Section: Methodsmentioning

confidence: 96%

mentioning

confidence: 99%

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Alternate muscle activity patterns among synergists of the quadriceps femoris including the vastus intermedius during low‐level sustained contraction in men

et al. 2012

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“…The MVC was determined according to our previously reported procedures (Watanabe and Akima 2011;Watanabe et al 2012a, b). Briefly, the subjects were asked to gradually increase their knee extension force from the baseline to maximum in 2-3 s and then sustain it maximally for 2 s. The timing of the task was based on a verbal count given at 1-s intervals, with vigorous encouragement from the investigators when the force began to plateau.…”

Section: Experimental Designmentioning

confidence: 99%

Age-related changes in motor unit firing pattern of vastus lateralis muscle during low-moderate contraction

Watanabe

Holobar

Kouzaki

et al. 2016

AGE

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Age-related changes in motor unit activation properties remain unclear for locomotor muscles such as quadriceps muscles, although these muscles are preferentially atrophied with aging and play important roles in daily living movements. The present study investigated and compared detailed motor unit firing characteristics for the vastus lateralis muscle during isometric contraction at low to moderate force levels in the elderly and young. Fourteen healthy elderly men and 15 healthy young men performed isometric ramp-up contraction to 70 % of the maximal voluntary contractions (MVC) during knee extension. Multichannel surface electromyograms were recorded from the vastus lateralis muscle using a two-dimensional grid of 64 electrodes and decomposed with the convolution kernel compensation technique to extract individual motor units. Motor unit firing rates in the young were significantly higher (~+29.7 %) than in the elderly (p < 0.05). There were significant differences in firing rates among motor units with different recruitment thresholds at each force level in the young (p < 0.05) but not in the elderly (p > 0.05). Firing rates at 60 % of the MVC force level for the motor units recruited at <20 % of MVC were significantly correlated with MVC force in the elderly (r = 0.885, p < 0.0001) but not in the young (r = 0.127, p > 0.05). These results suggest that the motor unit firing rate in the vastus lateralis muscle is affected by aging and muscle strength in the elderly and/or age-related strength loss is related to motor unit firing/ recruitment properties.

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“…We recently developed a technique to record surface EMG from the VI muscle (Watanabe & Akima, 2009a, b, 2010, in press). This research demonstrated that surface EMG of the VI muscle can be detected from a superficial region located at a lateral distal portion of the thigh that can be identified under ultrasonographic guidance (Watanabe & Akima, 2009a).…”

mentioning

confidence: 99%

Effect of knee joint angle on neuromuscular activation of the vastus intermedius muscle during isometric contraction

Watanabe

Akima

2011

Scandinavian Med Sci Sports

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The purpose of this study was to compare the relationship between surface electromyography (EMG) and knee joint angle of the vastus intermedius muscle (VI) with the synergistic muscles in the quadriceps femoris (QF) muscle group. Fourteen healthy men performed maximal voluntary contractions during isometric knee extension at four knee joint angles from 90°, 115°, 140°, and 165° (180° being full extension). During the contractions, surface EMG was recorded at four muscle components of the QF muscle group: the VI, vastus lateralis (VL), vastus medialis (VM), and rectus femoris (RF) muscles. The root mean square of the surface EMG at each knee joint angle was calculated and normalized by that at a knee joint angle of 90° for individual muscles. The normalized RMS of the VI muscle was significantly lower than those of the VL and RF muscles at the knee joint angles of 115° and 165° and those of the VL, VM, and RF muscles at the knee joint angle of 140° (P<0.05). The present results suggest that the neuromuscular activation of the VI muscle is regulated in a manner different from the alteration of the knee joint angle compared with other muscle components of the QF muscle group.

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Validity of surface electromyography for vastus intermedius muscle assessed by needle electromyography

Cited by 38 publications

References 15 publications

Alternate muscle activity patterns among synergists of the quadriceps femoris including the vastus intermedius during low‐level sustained contraction in men

Alternate muscle activity patterns among synergists of the quadriceps femoris including the vastus intermedius during low‐level sustained contraction in men

Age-related changes in motor unit firing pattern of vastus lateralis muscle during low-moderate contraction

Effect of knee joint angle on neuromuscular activation of the vastus intermedius muscle during isometric contraction

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