scholarly journals Interlimb Asymmetries Identified Using the Rate of Torque Development in Ballistic Contraction Targeting Submaximal Torques

2018 ◽  
Vol 9 ◽  
Author(s):  
Gennaro Boccia ◽  
Paolo Riccardo Brustio ◽  
Giampiero Buttacchio ◽  
Marzia Calabrese ◽  
Marco Bruzzone ◽  
...  
Author(s):  
Matheus Henrique Maiolini Ducatti ◽  
Marina Cabral Waiteman ◽  
Ana Flávia Balotari Botta ◽  
Helder dos Santos Lopes ◽  
Neal Robert Glaviano ◽  
...  

Author(s):  
Benjamin Ian Goodlich ◽  
Sean A Horan ◽  
Justin J Kavanagh

Serotonin (5-HT) is a neuromodulator that is critical for regulating the excitability of spinal motoneurons and the generation of muscle torque. However, the role of 5-HT in modulating human motor unit activity during rapid contractions has yet to be assessed. Nine healthy participants (23.7 ± 2.2 yr) ingested 8 mg of the competitive 5-HT2 antagonist cyproheptadine in a double-blinded, placebo-controlled, repeated-measures experiment. Rapid dorsiflexion contractions were performed at 30%, 50% and 70% of maximal voluntary contraction (MVC), where motor unit activity was assessed by high-density surface electromyographic decomposition. A second protocol was performed where a sustained, fatigue-inducing dorsiflexion contraction was completed prior to undertaking the same 30%, 50% and 70% MVC rapid contractions and motor unit analysis. Motor unit discharge rate (p < 0.001) and rate of torque development (RTD; p = 0.019) for the unfatigued muscle were both significantly lower for the cyproheptadine condition. Following the fatigue inducing contraction, cyproheptadine reduced motor unit discharge rate (p < 0.001) and RTD (p = 0.024), where the effects of cyproheptadine on motor unit discharge rate and RTD increased with increasing contraction intensity. Overall, these results support the viewpoint that serotonergic effects in the central nervous system occur fast enough to regulate motor unit discharge rate during rapid powerful contractions.


2017 ◽  
Vol 2017 (S4A) ◽  
pp. 29-37
Author(s):  
Ana Carolina de M A Rodrigues ◽  
Nathália Arnosti Vieira ◽  
Sergio Augusto Cunha ◽  
Sérgio Rocha Piedade

PLoS ONE ◽  
2015 ◽  
Vol 10 (4) ◽  
pp. e0119719 ◽  
Author(s):  
Baptiste Morel ◽  
David M. Rouffet ◽  
Damien Saboul ◽  
Samuel Rota ◽  
Michel Clémençon ◽  
...  

2021 ◽  
pp. 105527
Author(s):  
Raiff Simplicio da Silva ◽  
Mikhail Santos Cerqueira ◽  
Daniel Germano Maciel ◽  
Stephano Tomaz da Silva ◽  
Marianna Celeste Cordeiro De Figueiredo ◽  
...  

2019 ◽  
Vol 40 (2) ◽  
pp. 025002 ◽  
Author(s):  
Paolo Riccardo Brustio ◽  
Roberto Casale ◽  
Giampiero Buttacchio ◽  
Marzia Calabrese ◽  
Marco Bruzzone ◽  
...  

2019 ◽  
Vol 237 (10) ◽  
pp. 2653-2664 ◽  
Author(s):  
Jonathan D. Miller ◽  
C. J. Lund ◽  
Marissa D. Gingrich ◽  
Kyle L. Schtul ◽  
Mandy E. Wray ◽  
...  

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