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Neural activation of the triceps surae is impaired following 2�weeks of immobilization
Abstract
The purpose of this study was to investigate the effect of 2 weeks of ankle joint immobilization on triceps surae neural activation, with particular emphasis on the potential differences between the monoarticular soleus and the biarticular gastrocnemius muscles. Seventeen male volunteers were divided into the immobilized group (IG, n = 8) and the control group (CG, n = 9). Elastic adhesive bandages and an ankle stabilization orthosis were used to immobilize the ankle joint only. The plantar flexor torque obtained during maximal voluntary contractions (MVC) and after single, paired and tetanic stimuli applied at rest was measured. The associated EMG activity from the soleus and gastrocnemius muscles was also recorded, and their activation levels were estimated by means of the twitch interpolation technique. After immobilization, triceps surae maximal voluntary torque significantly decreased by 17% (P < 0.001). Strength losses were accompanied by a decrement in activation level (-6%, average of the three techniques used) and in maximal 100 Hz tetanic force (-11%). A significant decrease in the soleus (-22%, P < 0.05) but not in the gastrocnemius EMG activity, normalized to respective M-waves, was also found. It was concluded that the reduced voluntary torque output after immobilization could be attributed to both muscular and neural alterations. These latter selectively involved the monoarticular soleus muscle, while neural drive to the biarticular gastrocnemii, which had not b…
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The discrepancy between the loss of muscle quantity and function after bed rest must be further explained by a decrease in muscle quality, tendon alterations, neural factors, muscle architecture change, reduced neural drive, alterations in tendon mechanical properties, muscle fiber atrophy and force reduction, fiber phenotype shift, reduction in myofibrillar content, impaired calcium release, and,
“The discrepancy between the loss of muscle quantity and function after bed rest must be further explained by a decrease in “muscle quality,” tendon alterations, and neural factors, muscle architecture change (79), reduced neural drive (23, 60, 80–82), alterations in tendon mechanical properties (83), muscle fiber atrophy and force reduction (72, 84–87), fiber phenotype shift toward fast twitch”
From Nonuniform loss of muscle strength and atrophy during bed rest: a systematic review (2021) · cites this paper as [60]
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Nonuniform loss of muscle strength and atrophy during bed rest: a systematic review
Marusic, U., Narici, M., Simunic, B., Pisot, R., & Ritzmann, R. (2021) · Journal of Applied Physiology · doi:10.1152/japplphysiol.00363.2020 · Cited by 185
Metadata
- Authors
- Gondin, J., Guette, M., Maffiuletti, N. A., & Martin, A.
- Affiliations
- Inserm (FR)
- Corresponding author
- Gondin, J.
- Venue
- European Journal of Applied Physiology
- Published
- 2004-10-14
- Volume
- 93
- Issue
- 3
- Pages
- 359-365
- ISSN
- 0020-9376 (ISSN-L)
- 1439-6319
- 1439-6327
- OpenAlex
- W1984795628
- Cited by
- 47
- References
- 1
- Citations by year
- 2025: 1 · 2024: 2 · 2023: 2 · 2022: 2 · 2021: 2 · 2019: 1 · 2018: 1 · 2017: 2 · 2016: 2 · 2014: 5 · 2013: 4 · 2012: 1
- FWCI
- 1.81
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- www.springer.com/tdm (tdm)
- Locations
- European Journal of Applied Physiology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Engineering › Biomedical Engineering › Muscle activation and electromyography studies
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
- Health Sciences › Medicine › Physiology (medical) › Cardiovascular and exercise physiology
- Keywords
- triceps surae, muscle immobilization, soleus muscle, gastrocnemius, neuronal activation, muscle strength decline, plantarflexion torque, tetanic force, M-wave, ankle joint, knee flexion
- MeSH terms
- Adult, Ankle Joint, Electromyography, Humans, Immobilization, Leg, Male, Muscle, Skeletal, Torque
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