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Fentanyl is a potent synthetic opioid widely used perioperatively and illicitly as a drug of abuse . It is well established that fentanyl acts as a μ-opioid receptor agonist, signaling through Gα intracellular pathways to inhibit electrical excitability, resulting in analgesia and respiratory depression . However, fentanyl uniquely also triggers muscle rigidity, including respiratory muscles, hindering the ability to execute central respiratory commands or to receive external resuscitation.
View Article and Find Full Text PDFResting-State EEG Oscillations in Amyotrophic Lateral Sclerosis (ALS): Toward Mechanistic Insights and Clinical Markers.
J Clin Med
January 2025
Faculty of Physical Culture and Health, Institute of Physical Culture Sciences, University of Szczecin, Al. Piastów 40B blok 6, 71-065 Szczecin, Poland.
Amyotrophic lateral sclerosis (ALS) is a complex, progressive neurodegenerative disorder characterized by the degeneration of motor neurons in the brain, brainstem, and spinal cord. Several neuroimaging techniques can help reveal the pathophysiology of ALS. One of these is the electroencephalogram (EEG), a noninvasive and relatively inexpensive tool for examining electrical activity of the brain with excellent temporal precision.
View Article and Find Full Text PDFRevisiting motor unit recruitment to TMS in amyotrophic lateral sclerosis: cortical inhibition is retained during voluntary contractions.
Exp Brain Res
January 2025
Dept. of Neurosurgery, Upstate Medical University, 750 E. Adams St, Syracuse, NY, 13210, USA.
Transcranial magnetic stimulation (TMS) has been used for many years to study the pathophysiology of amyotrophic lateral sclerosis (ALS). Based on single- or dual-pulse TMS and EMG and/or single motor unit (MU) recordings, many groups have described a loss of central inhibition as an early marker of ALS dysfunction, reflecting a state of cortical 'hyperexcitability'. This conclusion is not without its detractors, however, leading us to reexamine this issue using 4-pulse TMS, shown previously to be more effective for testing central motor pathway functional integrity.
View Article and Find Full Text PDFNeuromuscular factors predicting lower limb explosive strength in male college sprinters.
Front Physiol
January 2025
Sports Science School, Beijing Sport University, Beijing, China.
Purpose: This study aimed to explore the effects of neural and muscular factors on lower limb explosive strength in male college sprinters, and build models based on those factors to identify the key neuromuscular factors that predict the rate of force development (RFD) and 30 m sprint time.
Method: 15 male college sprinters were recruited in this study, with 100 m personal best times under 10.93 s.
Homeostatic regulation of a motor circuit through temperature sensing rather than activity sensing.
bioRxiv
January 2025
University of Missouri-Columbia, Division of Biological Sciences, Missouri, United States of America.
Homeostasis is a driving principle in physiology. To achieve homeostatic control of neural activity, neurons monitor their activity levels and then initiate corrective adjustments in excitability when activity strays from a set point. However, fluctuations in the brain microenvironment, such as temperature, pH, and other ions represent some of the most common perturbations to neural function in animals.
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