Effects of eccentric versus concentric contractions of the biceps brachii on intracortical inhibition and facilitation

2018 ◽  
Vol 29 (3) ◽  
pp. 369-379 ◽  
Author(s):  
Christopher Latella ◽  
Alicia M. Goodwill ◽  
Makii Muthalib ◽  
Ashlee M. Hendy ◽  
Brendan Major ◽  
...  
Keyword(s):  
Biceps Brachii ◽  
Intracortical Inhibition ◽  
Concentric Contractions ◽  
Intracortical Inhibition And Facilitation

Intracortical Inhibition and Facilitation in Different Representations of the Human Motor Cortex

1998 ◽  
Vol 80 (6) ◽  
pp. 2870-2881 ◽  
Author(s):  
Robert Chen ◽  
Alda Tam ◽  
Cathrin Bütefisch ◽  
Brian Corwell ◽  
Ulf Ziemann ◽  
...  
Keyword(s):  
Motor Cortex ◽  
Biceps Brachii ◽  
Conditioning Stimulus ◽  
Motor Evoked Potential ◽  
Intracortical Inhibition ◽  
Abductor Hallucis ◽  
Human Motor Cortex ◽  
Human Motor ◽  
Motor Representations ◽  
Intracortical Inhibition And Facilitation

Chen, Robert, Alda Tam, Cathrin Bütefisch, Brian Corwell, Ulf Ziemann, John C. Rothwell, and Leonardo G. Cohen. Intracortical inhibition and facilitation in different representations of the human motor cortex. J. Neurophysiol. 80: 2870–2881, 1998. Intracortical inhibition (ICI) and intracortical facilitation (ICF) of the human motor cortex can be studied with paired transcranial magnetic stimulation (TMS). Plastic changes and some neurological disorders in humans are associated with changes in ICI and ICF. Although well characterized in the hand representation, it is not known if ICI and ICF vary across different body part representations. Therefore we studied ICI and ICF in different motor representations of the human motor cortex. The target muscles were rectus abdominus (RA), biceps brachii (BB), abductor pollicis brevis (APB), quadriceps femoris (QF), and abductor hallucis (AH). For each muscle, we measured the rest and active motor thresholds (MTs), the motor-evoked potential (MEP) stimulus-response curve (MEP recruitment), ICI, and ICF. The effects of different interstimulus intervals (ISIs) were studied with a conditioning stimulus (CS) intensity of 80% active MT. The effects of different CS intensities were studied at ISI of 2 ms for ICI and ISI of 15 ms for ICF. MT was lowest for APB, followed by BB, AH, and QF, and was highest for RA. Except for BB, MEP recruitment was generally steeper for muscles with lower MT. ICI and ICF were present in all the motor representations tested. The stimulus intensity necessary to elicit ICI was consistently lower than that required to elicit ICF, suggesting that they are mediated by separate mechanisms. Despite wide differences in MT and MEP recruitment, the absolute CS intensities (expressed as percentage of the stimulator's output) required to elicit ICI and ICF appear unrelated to MT and MEP recruitment in the different muscles tested. These findings suggest that the intracortical mechanisms for inhibition and facilitation in different motor representations are not related to the strength of corticospinal projections.

Intracortical Inhibition and Facilitation after congenital stroke

2006 ◽  
Vol 37 (01) ◽  
Author(s):  
S Berweck ◽  
V Brodbeck ◽  
M Walther ◽  
N Wagner ◽  
M Staudt ◽  
...  
Keyword(s):  
Intracortical Inhibition ◽  
Intracortical Inhibition And Facilitation

P2-36. Short-interval intracortical inhibition and facilitation in Parkinson’s disease

2013 ◽  
Vol 124 (8) ◽  
pp. e36
Author(s):  
Yuichiro Shirota ◽  
Yasuo Terao ◽  
Shinya Ohminami ◽  
Ryosuke Tsutsumi ◽  
Yoshikazu Ugawa ◽  
...  
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Short Interval ◽  
Intracortical Inhibition ◽  
Intracortical Inhibition And Facilitation

scholarly journals Corticospinal excitability underlying digit force planning for grasping in humans

2014 ◽  
Vol 111 (12) ◽  
pp. 2560-2569 ◽  
Author(s):  
Pranav Parikh ◽  
Marco Davare ◽  
Patrick McGurrin ◽  
Marco Santello
Keyword(s):  
Primary Motor Cortex ◽  
Single Pulse ◽  
Intracortical Inhibition ◽  
Corticospinal Excitability ◽  
Reach To Grasp ◽  
Grasp Planning ◽  
Sensorimotor Memory ◽  
Force Planning ◽  
Intracortical Inhibition And Facilitation

Control of digit forces for grasping relies on sensorimotor memory gained from prior experience with the same or similar objects and on online sensory feedback. However, little is known about neural mechanisms underlying digit force planning. We addressed this question by quantifying the temporal evolution of corticospinal excitability (CSE) using single-pulse transcranial magnetic stimulation (TMS) during two reach-to-grasp tasks. These tasks differed in terms of the magnitude of force exerted on the same points on the object to isolate digit force planning from reach and grasp planning. We also addressed the role of intracortical circuitry within primary motor cortex (M1) by quantifying the balance between short intracortical inhibition and facilitation using paired-pulse TMS on the same tasks. Eighteen right-handed subjects were visually cued to plan digit placement at predetermined locations on the object and subsequently to exert either negligible force (“low-force” task, LF) or 10% of their maximum pinch force (“high-force” task, HF) on the object. We found that the HF task elicited significantly smaller CSE than the LF task, but only when the TMS pulse coincided with the signal to initiate the reach. This force planning-related CSE modulation was specific to the muscles involved in the performance of both tasks. Interestingly, digit force planning did not result in modulation of M1 intracortical inhibitory and facilitatory circuitry. Our findings suggest that planning of digit forces reflected by CSE modulation starts well before object contact and appears to be driven by inputs from frontoparietal areas other than M1.

Intracortical inhibition and facilitation in human facial motor area: difference between upper and lower facial area

2001 ◽  
Vol 112 (9) ◽  
pp. 1604-1611 ◽  
Author(s):  
Masahito Kobayashi ◽  
Hugo Théoret ◽  
Felix-Manuel Mottaghy ◽  
Massimo Gangitano ◽  
Alvaro Pascual-Leone
Keyword(s):  
Intracortical Inhibition ◽  
Motor Area ◽  
Facial Area ◽  
Intracortical Inhibition And Facilitation ◽  
Area Difference

Cortical Damage and Disability in Multiple Sclerosis: Relation to Intracortical Inhibition and Facilitation

2016 ◽  
Vol 9 (4) ◽  
pp. 566-573 ◽  
Author(s):  
Julia C. Nantes ◽  
Jidan Zhong ◽  
Scott A. Holmes ◽  
Sridar Narayanan ◽  
Yves Lapierre ◽  
...  
Keyword(s):  
Multiple Sclerosis ◽  
Intracortical Inhibition ◽  
Cortical Damage ◽  
Intracortical Inhibition And Facilitation
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