Proprioceptive control of human wrist extensor motor units during an attention-demanding task

Nafati, Gilel; Rossi-Durand, Christiane; Schmied, Annie

doi:10.1016/j.brainres.2004.05.066

Cited by 27 publications

(22 citation statements)

References 51 publications

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“…4 and 5). Indeed, gamma-drive activation is thought to be associated with arousal, difficulty, and level of attention required by the motor task (Nafati, Rossi-Durand, & Schmied, 2004;Prochazka, 1989;Prochazka, Hulliger, Zangger, & Appenteng, 1985). With the experimental procedures used in our study, the participants were informed about the forthcoming condition before each trial, which should have generated a higher level of stress in them when MA trial was announced compared to control condition in which they had to do nothing across the trial.…”

Section: Discussionmentioning

confidence: 98%

Modulation of human motoneuron activity by a mental arithmetic task

Bensoussan

Duclos

Rossi-Durand

2012

Human Movement Science

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Section: Discussionmentioning

confidence: 98%

Modulation of human motoneuron activity by a mental arithmetic task

Bensoussan

Duclos

Rossi-Durand

2012

Human Movement Science

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“…However, fewer studies have used H-reflexes to assess reflex excitability within the UE (Lewis et al, 2004;Marchand-Pauvert et al, 2000;Miller et al, 1995;Nafati et al, 2004). We are aware of only one study that has examined the between-day reliability of the flexor carpi radialis (FCR) H-reflex (Jaberzadeh et al, 2004), while no study has examined between-day repeatability of the extensor carpi radialis longus (ECRL) H-reflex.…”

Section: Introductionmentioning

confidence: 95%

Between-day reliability of upper extremity H-reflexes

Stowe

Hughes-Zahner

Stylianou

et al. 2008

Journal of Neuroscience Methods

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“…Differential changes in the amplitudes of the H and stretch reflexes are typically interpreted to indicate a change in the sensitivity of the muscle spindle before and after an intervention (8,27). In contrast to the electrical stimulation that is used to elicit the H reflex, stretch of the muscle to evoke a stretch reflex involves the muscle spindle, and the magnitude of the response depends on the sensitivity of the muscle spindles, which is determined by the level of fusimotor activity.…”

Section: Stretch Reflexmentioning

confidence: 99%

“…In the present study, the small (ϳ7%) increase in the background EMG after vibration may indicate enhanced fusimotor drive to the muscle spindles (␣-␥ coactivation) to achieve the target force due to the vibration-induced decline in the force capacity of the muscle. Alternatively, fusimotor drive to the muscle spindles may have been selectively enhanced (15,27,29) after vibration.…”

Section: Stretch Reflexmentioning

confidence: 99%

Prolonged muscle vibration increases stretch reflex amplitude, motor unit discharge rate, and force fluctuations in a hand muscle

Shinohara¹,

Moritz²,

Pascoe³

et al. 2005

Journal of Applied Physiology

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The purpose of this study was to compare the influence of prolonged vibration of a hand muscle on the amplitude of the stretch reflex, motor unit discharge rate, and force fluctuations during steady, submaximal contractions. Thirty-two young adults performed 10 isometric contractions at a constant force (5.0 +/- 2.3% of maximal force) with the first dorsal interosseus muscle. Each contraction was held steady for 10 s, and then stretch reflexes were evoked. Subsequently, 20 subjects had vibration applied to the relaxed muscle for 30 min, and 12 subjects received no vibration. The muscle vibration induced a tonic vibration reflex. The intervention (vibration or no vibration) was followed by 2 sets of 10 constant-force contractions with applied stretches (After and Recovery trials). The mean electromyogram amplitude of the short-latency component of the stretch reflex increased by 33% during the After trials (P < 0.01) and by 38% during the Recovery trials (P < 0.01). The standard deviation of force during the steady contractions increased by 21% during the After trials (P < 0.05) and by 28% during the Recovery trials (P < 0.01). The discharge rate of motor units increased from 10.3 +/- 2.7 pulses/s (pps) before vibration to 12.2 +/- 3.1 pps (P < 0.01) during the After trials and to 11.9 +/- 2.6 pps during the Recovery trials (P < 0.01). There was no change in force fluctuations or stretch reflex magnitude for the subjects in the Control group. The results indicate that prolonged vibration increased the short-latency component of the stretch reflex, the discharge rate of motor units, and the fluctuations in force during contractions by a hand muscle. These adjustments were necessary to achieve the target force due to the vibration-induced decrease in the force capacity of the muscle.

show abstract

Proprioceptive control of human wrist extensor motor units during an attention-demanding task

Cited by 27 publications

References 51 publications

Modulation of human motoneuron activity by a mental arithmetic task

Modulation of human motoneuron activity by a mental arithmetic task

Between-day reliability of upper extremity H-reflexes

Prolonged muscle vibration increases stretch reflex amplitude, motor unit discharge rate, and force fluctuations in a hand muscle

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