| Title |
A spinal pathway between synergists can modulate activity in human elbow flexor muscles
|
|---|---|
| Published in |
Experimental Brain Research, July 2008
|
| DOI | 10.1007/s00221-008-1479-5 |
| Pubmed ID | |
| Authors |
Benjamin K. Barry, Zachary A. Riley, Michael A. Pascoe, Roger M. Enoka |
| Abstract |
Electrical stimulation of the brachioradialis branch of the radial nerve has been shown to inhibit the discharge of voluntarily activated motor units in biceps brachii during weak contractions with the elbow flexor muscles. The purpose of the present study was to characterise the inhibitory reflex by comparing its strength in the short and long heads of the biceps brachii and examining the influence of forearm position on the strength of the reflex. Spike-triggered stimulation was used to assess the influence of radial nerve stimulation on the discharge of single motor units in the biceps brachii of 15 subjects. Stimulation of the radial nerve prolonged the interspike interval (P < 0.001) of motor units in the long (n = 31, 4.8 +/- 5.6 ms) and short heads (n = 26, 8.1 +/- 12.3 ms) of biceps brachii with no difference between the two heads (P = 0.11). The strength of inhibition varied with forearm position for motor units in both heads (n = 18, P < 0.05). The amount of inhibition was greatest in pronation (7.9 +/- 8.9 ms), intermediate in neutral (5.8 +/- 7.1 ms), and least in supination (2.8 +/- 3.4 ms). These findings indicate that the inhibition evoked by afferent feedback from brachioradialis to low-threshold motor units (mean force 3-5% MVC) in biceps brachii varied with forearm posture yet was similar for the two heads of biceps brachii. This reflex pathway provides a mechanism to adjust the activation of biceps brachii with changes in forearm position, and represents a spinal basis for a muscle synergy in humans. |
X Demographics
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Geographical breakdown
| Country | Count | As % |
|---|---|---|
| United States | 4 | 50% |
| Unknown | 4 | 50% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Members of the public | 6 | 75% |
| Practitioners (doctors, other healthcare professionals) | 1 | 13% |
| Scientists | 1 | 13% |
Mendeley readers
The data shown below were compiled from readership statistics for 47 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Japan | 2 | 4% |
| France | 1 | 2% |
| Germany | 1 | 2% |
| United States | 1 | 2% |
| Poland | 1 | 2% |
| Unknown | 41 | 87% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Researcher | 10 | 21% |
| Student > Ph. D. Student | 8 | 17% |
| Student > Bachelor | 6 | 13% |
| Professor > Associate Professor | 6 | 13% |
| Student > Master | 4 | 9% |
| Other | 6 | 13% |
| Unknown | 7 | 15% |
| Readers by discipline | Count | As % |
|---|---|---|
| Neuroscience | 14 | 30% |
| Sports and Recreations | 8 | 17% |
| Medicine and Dentistry | 6 | 13% |
| Agricultural and Biological Sciences | 4 | 9% |
| Nursing and Health Professions | 2 | 4% |
| Other | 2 | 4% |
| Unknown | 11 | 23% |
Attention Score in Context
This research output has an Altmetric Attention Score of 6. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 26 December 2023.
All research outputs
#6,597,727
of 25,054,594 outputs
Outputs from Experimental Brain Research
#633
of 3,394 outputs
Outputs of similar age
#27,511
of 92,823 outputs
Outputs of similar age from Experimental Brain Research
#7
of 20 outputs
Altmetric has tracked 25,054,594 research outputs across all sources so far. This one has received more attention than most of these and is in the 73rd percentile.
So far Altmetric has tracked 3,394 research outputs from this source. They typically receive a little more attention than average, with a mean Attention Score of 5.4. This one has done well, scoring higher than 81% of its peers.
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We're also able to compare this research output to 20 others from the same source and published within six weeks on either side of this one. This one has gotten more attention than average, scoring higher than 70% of its contemporaries.