| Motor cortex excitability does not increase during sustained cycling exercise to volitional exhaustion. | |
| | |
MedLine Citation:
|
PMID: 22678968 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
|
The excitability of the motor cortex increases as fatigue develops during sustained single joint contractions, but there are no previous reports on how corticospinal excitability is affected by sustained locomotor exercise. Here we addressed this issue by measuring spinal and cortical excitability changes during sustained cycling exercise. Vastus lateralis (VL) and rectus femoris (RF) muscle responses to transcranial magnetic stimulation of the motor cortex (motor evoked potentials, MEPs) and electrical stimulation of the descending tracts (cervicomedullary evoked potentials, CMEPs) were recorded every three minutes from nine subjects during 30 minutes of cycling at 75% of maximum workload (W(max)), and every minute during subsequent exercise at 105% of W(max) until subjective task failure. Responses were also measured during non-fatiguing control bouts at 80% and 110% of W(max) prior to sustained exercise. There were no significant changes in MEPs or CMEPs (P > 0.05) during the sustained cycling exercise. These results suggest that, in contrast to sustained single joint contractions, sustained cycling exercise does not increase the excitability of motor cortical neurons. The contrasting corticospinal responses to the two modes of exercise may be due to differences in their associated systemic physiological consequences. |
| | |
Authors:
|
Simranjit Kaur Sidhu; Andrew G Cresswell; Timothy John Carroll |
Related Documents
:
|
16385848 - Paediatric exercise immunology: health and clinical applications. 18279038 - Sex-specific effects of handling time on an index of immune activity in zebra finches. 1996568 - Reactive oxygen species production by monocytes and polymorphonuclear leukocytes during... 19033608 - Neutrophil-degranulation and lymphocyte-subset response after 48 hr of fluid and/or ene... 12296528 - Pulmonary problems and management concerns in youth sports. 9071198 - Reliability of transcutaneous oximeter electrode heating power during exercise in patie... |
Publication Detail:
|
Type: JOURNAL ARTICLE Date: 2012-6-7 |
Journal Detail:
|
Title: Journal of applied physiology (Bethesda, Md. : 1985) Volume: - ISSN: 1522-1601 ISO Abbreviation: - Publication Date: 2012 Jun |
Date Detail:
|
Created Date: 2012-6-8 Completed Date: - Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 8502536 Medline TA: J Appl Physiol Country: - |
Other Details:
|
Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
|
1The University of Queensland. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Speed and incline during thoroughbred horse racing: racehorse speed supports a metabolic power const...
Next Document: Magnetic resonance assessment of parenchymal elasticity in normal and edematous, ventilator-injured ...