Co-contraction of the pronator teres and extensor carpi radialis during wrist extension movements in humans

Fujii, Hiromi; Kobayashi, Shinji; Sato, Toshiaki; Shinozaki, Katsuhiro; Naito, Akira

doi:10.1016/j.jelekin.2005.11.013

Cited by 18 publications

(24 citation statements)

References 20 publications

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“…Activities of ECRL, ECRB, and ECU were studied in 15 healthy human subjects (13 males, 2 females, age range 20-43 years) using the ENS method (Naito et al, 1994(Naito et al, , 2002Fujii et al, 2007). All of the subjects gave their informed consent to the experimental procedure, which was approved by the Ethics Committee of Yamagata University School of Medicine, Yamagata, Japan.…”

Section: Methodsmentioning

confidence: 99%

“…We have been studying actions of muscles in normal human subjects with an electrical neuromuscular stimulation (ENS) method (Naito et al, 1994(Naito et al, , 2002Fujii et al, 2007). Since the ENS method enables us to activate each individual muscle in living humans, it is very convenient to elucidate strict actions of the muscle.…”

Section: Introductionmentioning

confidence: 99%

“…However, as yet, no author has presented an analysis of the actions of the human wrist extensors using the ENS method. On the other hand, our previous ENS studies examined a direction and range of motion produced by ENS to each muscle (Naito et al, 1994(Naito et al, , 2002Fujii et al, 2007). However, since a motion of the wrist-bending is always influenced by the gravity (weight of the hand), it is difficult to know a real direction and strength of the wrist-bending force produced by ENS to the muscle with examination of the direction and range of the motion.…”

Section: Introductionmentioning

confidence: 99%

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Strict actions of the human wrist extensors: A study with an electrical neuromuscular stimulation method

Sagae¹,

Suzuki

Fujita³

et al. 2010

Journal of Electromyography and Kinesiology

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Motion and force produced by electrical neuromuscular stimulation (ENS) to each of the extensor carpi radialis longus (ECRL) and brevis (ECRB), and extensor carpi ulnaris (ECU) with the prone (P), semiprone (SP), and supine forearm (S) were studied in ten normal human subjects. Abduction (AB), extension (E), adduction (AD), and flexion (F) directions were represented by, respectively, 0°, 90°, 180°, and 270°. ENS to ECRL, ECRB, and ECU produced motion in direction of, respectively, 60° (mean), 87°, and 205° with P, 66°, 83°, and 166° with SP, and 47°, 66°, and 116° with S to maximal range. Direction/strength (Nm) of force by ENS to ECRL, ECRB, and ECU were, respectively, 54°/1.75, 74°/1.78, and 184°/1.49 with P, 34°/1.65, 63°/1.66, and 152°/1.43 with SP, and 32°/1.66, 70°/1.49, and 147°/1.25 with S. ENS to ECRL exhibited force of 15-20% of maximal E (15-20%Max-E) and 19-29%Max-AB, that to ECRB 24-32%Max-E, and that to ECU 17-30%Max-AD. The force study results suggest that ECRL is an abductor and extensor and ECRB is an extensor rather than an abductor. ECU should be an adductor rather than an extensor with SP and S and an adductor with P. The data must contribute to reconstruct motor functions of paralyzed hands.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Strict actions of the human wrist extensors: A study with an electrical neuromuscular stimulation method

Sagae¹,

Suzuki

Fujita³

et al. 2010

Journal of Electromyography and Kinesiology

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“…Since PT belongs to forearm pronators and ECR (ECRL, ECRB) to wrist extensors, activities of the muscles during repetitive movements of dynamic forearm pronation/supination, and those of static (isometric) wrist extension and dynamic wrist extension/flexion were studied using EMG. For EMG recording, bipolar intramuscular electrodes made of teflon-coated stainless steel wire (75 μm in diameter, SUS 316, AM system, Carlsborg WA, USA) with distance of about 4 mm were used (Basmajian & Deluca, 1985;Fujii et al, 2007;Naito et al, 1998b;Perotto, 1994). The electrodes were implanted percutaneously into the muscles with 25 gaugeinjection needles (Naito et al, 1998b, Riek et al, 2000.…”

Section: Emg Studymentioning

confidence: 99%

“…Calibration bars for integrated EMGs: a percentage of the amplitude produced by the maximum contraction. Reproduced with permission from Fujii et al (2007).…”

Section: Wwwintechopencommentioning

confidence: 99%

Functional Significance of Facilitation Between the Pronator Teres and Extensor Carpi Radialis in Humans: Studies with Electromyography and Electrical Neuromuscular Stimulation

Naito¹,

Fujii²,

Sato³

et al. 2012

EMG Methods for Evaluating Muscle and Nerve Function

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Facilitation from flexor digitorum superficialis to extensor carpi radialis in humans

et al. 2016

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Effects of low-threshold afferents from the flexor digitorum superficialis (FDS) to the extensor carpi radialis (ECR) motoneurons were examined using a post-stimulus time-histogram (PSTH) and electromyogram-averaging (EMG-A) methods in eight healthy human subjects. In the PSTH study in five of the eight subjects, electrical conditioning stimuli (ES) to the median nerve branch innervating FDS with the intensity below the motor threshold induced excitatory effects (facilitation) in 39 out of 92 ECR motor units. In 11 ECR motor units, the central synaptic delay of the facilitation was -0.1 ± 0.3 ms longer than that of the homonymous facilitation of ECR. Mechanical conditioning stimuli (MS) to FDS with the intensity below the threshold of the tendon(T)-wave-induced facilitation in 51 out of 51 ECR motor units. With the EMG-A method, early and significant peaks were produced by ES and MS in all the eight subjects. The difference between latencies of the peaks by ES and MS was almost equivalent to that of the Hoffmann- and T-waves of FDS by ES and MS. The peak was diminished by tonic vibration stimuli to FDS. These findings suggest that a facilitation from FDS to ECR exists in humans and group Ia afferents mediate the facilitation through a monosynaptic path.

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Co-contraction of the pronator teres and extensor carpi radialis during wrist extension movements in humans

Cited by 18 publications

References 20 publications

Strict actions of the human wrist extensors: A study with an electrical neuromuscular stimulation method

Strict actions of the human wrist extensors: A study with an electrical neuromuscular stimulation method

Functional Significance of Facilitation Between the Pronator Teres and Extensor Carpi Radialis in Humans: Studies with Electromyography and Electrical Neuromuscular Stimulation

Facilitation from flexor digitorum superficialis to extensor carpi radialis in humans

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