Can Ib axons be selectively activated by electrical stimuli in human subjects?

Heckman, C. J.; Condon, Sandra M.; Hutton, Robert S.; Enoka, Roger M.

doi:10.1016/0014-4886(84)90090-6

Cited by 31 publications

(10 citation statements)

References 14 publications

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“…The increase in the amplitude of the short-latency component of the stretch reflex in the first dorsal interosseus muscle contrasts with the frequently observed depression of H-reflex amplitude after vibration (1,6,11,38). This result, however, is consistent with other reports in the literature.…”

Section: Stretch Reflexcontrasting

confidence: 44%

“…For example, van Boxtel (39) observed a marked increase in the amplitude of the stretch reflex and depression of the H-reflex amplitude in the soleus muscle after 10-to 120-s vibration, with a slower recovery as vibration was prolonged. Furthermore, Heckman et al (11) reported that 20 min of vibration caused a 22-58% increase in stretch-reflex amplitude and a 55-100% decrease in H-reflex amplitude in the soleus muscle, and these changes persisted for 15-30 min. In the present study, the amplitude of the short-latency component of the stretch reflex increased by 33-38% after 30 min of vibration, and this increase lasted for at least 20 min.…”

Section: Stretch Reflexmentioning

confidence: 99%

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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.

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Section: Stretch Reflexcontrasting

confidence: 44%

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

Self Cite

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“…When vibration exposure is prolonged, a decrease in alpha motoneuron activity has been reported (Bongiovanni and Hagbarth, 1990 ; Bongiovanni et al, 1990 ). This is likely linked to an attenuation of Ia afferent discharge, supported by reductions in spinal loop excitability after prolonged LV (Heckman et al, 1984 ; Hayward et al, 1986 ; Fry and Folland, 2014 ; Farabet et al, 2016 ). Based on the lack of changes in the F-wave (Christova et al, 2011 ; Lapole et al, 2012b ), it has been argued that intrinsic motoneuronal excitability is not impacted after prolonged LV; however, many authors have suggested the F-wave provides a flawed measure of motoneuron excitability (for review, see McNeil et al, 2013 ).…”

Section: Introductionmentioning

confidence: 99%

An Acute Exposure to Muscle Vibration Decreases Knee Extensors Force Production and Modulates Associated Central Nervous System Excitability

Souron

Besson

McNeil

et al. 2017

Front. Hum. Neurosci.

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Local vibration (LV) has been recently validated as an efficient training method to improve muscle strength. Understanding the acute effects may help elucidate the mechanism(s). This study aimed to investigate the effects of a single bout of prolonged LV on knee extensor force production and corticospinal responsiveness of vastus lateralis (VL) and rectus femoris (RF) muscles in healthy young and old adults. Across two visits, 23 adult subjects (20–75 years old) performed pre- and post-test measurements, separated by 30-min of either rest (control; CON) or LV. Maximal voluntary contraction (MVC) force was assessed and transcranial magnetic stimulation (TMS) was used to evaluate cortical voluntary activation (VATMS) as well as the motor evoked potential (MEP) and silent period (SP). In 11 young adults, thoracic electrical stimulation was used to assess the thoracic motor evoked potential (TMEP). Although MVC decreased after both CON (−6.3 ± 4.4%, p = 0.01) and LV (−12.9 ± 7.7%, p < 0.001), the MVC loss was greater after LV (p = 0.001). Normalized maximal electromyographic (EMG) activity decreased after LV for both VL (−25.1 ± 10.7%) and RF (−20.9 ± 16.5%; p < 0.001), while it was unchanged after CON (p = 0.32). For RF, the TMEP and MEP/TMEP ratio decreased (p = 0.01) and increased (p = 0.01) after LV, respectively. Both measures were unchanged for VL (p = 0.27 and p = 0.15, respectively). No changes were reported for TMS-related parameters. These results confirm our hypothesis that modulations within the central nervous system would accompany the significant reduction of maximal voluntary force. A reduced motoneuron excitability seems to explain the decreased MVC after prolonged LV, as suggested by reductions in maximal EMG (all subjects) and TMEP area (data from 11 young subjects). A concomitant increased cortical excitability seems to compensate for lower excitability at the spinal level.

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Section: Psth Experimentsmentioning

confidence: 99%

“…Coppin, Jack & MacLennan (1970) showed in the cat that a long-lasting mechanical vibration applied to a muscle tendon selectively increases the electrical threshold of I a afferents. In man, Heckman, Condon, Hutton & Enoka (1984) showed that after such prolonged tendon vibration, the monosynaptic soleus H reflex was deeply depressed. This artifice was used to abolish the conditioning H reflex without any modification of the conditioning stimulus, and to see what happened to the long-lasting inhibition evoked in the antagonistic motor nucleus.…”

Section: Complementary Experiments Electrophysiological Experimentsmentioning

confidence: 99%

Recurrent inhibition between motor nuclei innervating opposing wrist muscles in the human upper limb.

Aymard

Decchi

Katz

et al. 1997

The Journal of Physiology

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Can Ib axons be selectively activated by electrical stimuli in human subjects?

Cited by 31 publications

References 14 publications

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

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

An Acute Exposure to Muscle Vibration Decreases Knee Extensors Force Production and Modulates Associated Central Nervous System Excitability

Recurrent inhibition between motor nuclei innervating opposing wrist muscles in the human upper limb.

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