Combined electromyography--31P-magnetic resonance spectroscopy study of human muscle fatigue during static contraction

Muscle & Nerve
David BendahanP J Cozzone

Abstract

Metabolic changes measured by 31P-magnetic resonance spectroscopy and surface electromyograms were simultaneously recorded during isometric contraction of forearm flexor muscles sustained at 60% of maximal force until exhaustion. Throughout the fatigue trial, energy in the low-frequency (L) band continuously increased whereas energy in the high-frequency (H) band first increased and fell only prior to exhaustion. PCr content decreased linearly. Intracellular pH (pHi) transiently increased during the first 22 s of trial. The triggering of acidosis was associated with critical PCr values (35-70% of initial content) and decreased electromyogram (EMG) energy in the H band. Linear relationships were only found between energy in the L band, pHi, and PCr content. The interindividual variability of metabolic and EMG changes was high despite standardized conditions of contraction. Maximal PCr consumption was correlated with the maximal pHi decrease measured at the end of the trial. Overall, there was no correlation between H/L EMG ratio and changes in muscle metabolism.

References

Jan 1, 1979·Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology·D GrossP T Macklem
Oct 1, 1977·Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology·L LindströmI Petersén
Dec 1, 1992·Electroencephalography and Clinical Neurophysiology·P Vestergaard-PoulsenO Henriksen
Feb 1, 1991·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·A R Mazzeo, G C Levy
Oct 1, 1990·Sports Medicine·B SjödinF S Apple
Sep 9, 1988·The American Journal of Cardiology·M P KaufmanK J Rybicki
Jul 1, 1987·Journal of Neurophysiology·J J WoodsB Bigland-Ritchie
Dec 1, 1986·Circulation Research·C L StebbinsJ C Longhurst
Jan 1, 1987·European Journal of Applied Physiology and Occupational Physiology·M J ZwartsH T Haenen
Nov 1, 1986·Acta Physiologica Scandinavica·G SjøgaardB Saltin
Dec 1, 1985·Journal of Applied Physiology·S F LewisR L Nunnally
Feb 1, 1986·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·D J TaylorG K Radda
Jan 1, 1973·Journal of the Neurological Sciences·M A JohnsonD Appleton
Jul 1, 1983·The American Journal of Physiology·K SahlinH Sjöholm
Nov 1, 1981·Proceedings of the National Academy of Sciences of the United States of America·B ChanceA Sapega
Nov 1, 1981·Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology·B Bigland-RitchieC S Roussos
Jun 1, 1993·The Journal of Physiology·M L BleiM J Kushmerick

❮ Previous
Next ❯

Citations

Sep 23, 1997·British Journal of Sports Medicine·D M PinciveroR G Karunakara
Jan 14, 2010·Ergonomics·Laura A Frey Law, Keith G Avin
Feb 9, 2007·The Tohoku Journal of Experimental Medicine·Hiroshi MaejimaYoshiko Tobimatsu
Dec 18, 2019·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Fabian NiessMartin Meyerspeer

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.