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Your search keyword '"Self-sustained muscle activity"' showing total 3 results
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3 results on '"Self-sustained muscle activity"'

1. Effect of hypercapnia on self-sustained muscle activity.

Author

Hatano, Kei, Shirakawa, Kazuki, Usuda, Noboru, Matsuura, Ryouta, Ohtsuka, Yoshinori, and Yunoki, Takahiro

Subjects
*NEURAL stimulation, *ELECTRIC stimulation, *MUSCLE fatigue, *BODY movement, *NERVOUS system
Abstract

The aim of the present study was to determine the effect of hypercapnia on motor neuromuscular activity of the human triceps surae muscle. Nine subjects participated in trials in a normal breathing condition and a CO2 rebreathing condition. In both conditions, in order to provoke self-sustained muscle activity, percutaneous electrical train stimulation was applied to the tibial nerve while each subject lay on a bed. Self-sustained muscle activity, which is an indirect observation of plateau potentials in spinal motoneurons, was measured for 30 s after the train stimulation by using surface electromyography. The sustained muscle activity was increased by CO2 rebreathing (P < 0.05). This finding suggests that motor neuromuscular activity may be linked to the respiratory system that is activated during hypercapnia. [ABSTRACT FROM AUTHOR]

Published
2018
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2. Enhancement of self-sustained muscle activity through external dead space ventilation appears to be associated with hypercapnia

Author

Hatano, Kei, Matsuura, Ryouta, Ohtsuka, Yoshinori, Yunoki, Takahiro, Hatano, Kei, Matsuura, Ryouta, Ohtsuka, Yoshinori, and Yunoki, Takahiro

Abstract

We reported that external dead space ventilation (EDSV) enhanced self-sustained muscle activity (SSMA) of the human soleus muscle, which is an indirect observation of plateau potentials. However, the main factor for EDSV to enhance SSMA remains unclear. The purpose of the present study was to examine the effects of EDSV-induced hypercapnia, hypoxia, and hyperventilation on SSMA. In Experiment 1 (n = 11; normal breathing [NB], EDSV, hypoxia, and voluntary hyperventilation conditions) and Experiment 2 (n = 9; NB and normoxic hypercapnia [NH] conditions), SSMA was evoked by electrical train stimulations of the right tibial nerve and measured using surface electromyography under each respiratory condition. In Experiment 1, SSMA was significantly higher than that in the NB condition only in the EDSV condition (P < 0.05). In Experiment 2, SSMA was higher in the NH condition than in the NB condition (P < 0.05). These results suggest that the EDSV-enhanced SSMA is due to hypercapnia, not hypoxia or increased ventilation.

Published
2022

3. Enhancement of self-sustained muscle activity through external dead space ventilation appears to be associated with hypercapnia

Author

Kei Hatano, Takahiro Yunoki, Yoshinori Ohtsuka, and Ryouta Matsuura

Subjects
Adult, Male, Pulmonary and Respiratory Medicine, medicine.medical_specialty, Physiology, Electromyography, Hypercapnia, Internal medicine, Hyperventilation, medicine, Humans, Plateau potentials, Self-sustained muscle activity, Respiratory system, Hypoxia, Muscle, Skeletal, Motor Neurons, Soleus muscle, medicine.diagnostic_test, Central chemoreceptors, Chemistry, General Neuroscience, Hypoxia (medical), Chemoreceptor Cells, Electric Stimulation, Cardiology, Breathing, medicine.symptom
Abstract

We reported that external dead space ventilation (EDSV) enhanced self-sustained muscle activity (SSMA) of the human soleus muscle, which is an indirect observation of plateau potentials. However, the main factor for EDSV to enhance SSMA remains unclear. The purpose of the present study was to examine the effects of EDSV-induced hypercapnia, hypoxia, and hyperventilation on SSMA. In Experiment 1 (n = 11; normal breathing [NB], EDSV, hypoxia, and voluntary hyperventilation conditions) and Experiment 2 (n = 9; NB and normoxic hypercapnia [NH] conditions), SSMA was evoked by electrical train stimulations of the right tibial nerve and measured using surface electromyography under each respiratory condition. In Experiment 1, SSMA was significantly higher than that in the NB condition only in the EDSV condition (P < 0.05). In Experiment 2, SSMA was higher in the NH condition than in the NB condition (P < 0.05). These results suggest that the EDSV-enhanced SSMA is due to hypercapnia, not hypoxia or increased ventilation.

Published
2022
Full Text
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