Basic characteristics between mechanomyogram and muscle force during twitch and tetanic contractions in rat skeletal muscles |
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| Affiliation: | 1. Department of Medical Technology, Graduate School of Health Sciences, Okayama University, Okayama, Japan;2. Department of Medical Technology, Faculty of Health Sciences, Okayama University, Okayama, Japan;1. Mayo Clinic Graduate School of Biomedical Sciences, Mayo Clinic, Rochester, MN, United States;2. Department of Orthopedic Surgery, Mayo Clinic, Rochester, MN, United States;3. Department of Physiology & Biomedical Engineering, Mayo Clinic, Rochester, MN, United States;1. Department of Occupational Science and Technology, University of Wisconsin–Milwaukee, Milwaukee, WI, USA;2. Department of Physical Medicine and Rehabilitation, Medical College of Wisconsin, Milwaukee, WI, USA;3. Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, IL, USA;4. Department of Biomedical Engineering, University of Wisconsin–Milwaukee, Milwaukee, WI, USA;1. Programa de Engenharia Biomédica (COPPE), Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil;2. Centre of Precision Rehabilitation for Spinal Pain (CPR Spine), School of Sport, Exercise and Rehabilitation Sciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham, UK;3. Department of Clinical and Experimental Sciences, Università degli Studi di Brescia, Brescia, Italy;4. Laboratorio di Ingegneria del Sistema Neuromuscolare (LISiN), Politecnico di Torino, Torino, TO, Italy;5. PolitoBIOMed Lab, Politecnico di Torino, Torino, Italy;1. School of Electrical & Electronic Engineering, University College Dublin, Dublin, Ireland;2. School of Public Health, Physiotherapy and Sports Science, University College Dublin, Dublin, Ireland;3. Biomedical Sciences Department, Neuromuscular Physiology Laboratory, University of Padova, Italy;1. Department of Biomedical Engineering, Northwestern University, McCormick School of Engineering, Evanston, IL, USA;2. Shirley Ryan AbilityLab, Chicago, IL, USA;3. Department of Physical Therapy and Human Movement Sciences, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA;4. Feinberg School of Medicine, Northwestern University, Chicago, IL, USA;5. Department of Physical Medicine and Rehabilitation, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA |
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| Abstract: | The mechanomyogram (MMG) is a signal measured by various vibration sensors for slight vibrations induced by muscle contraction, and it reflects the muscle force during electrically induced-contraction or until 60%–70% maximum voluntary contraction, so the MMG is considered an alternative and novel measurement tool for muscle strength. We simultaneously measured the MMG and muscle force in the gastrocnemius (GC), vastus intermedius (VI), and soleus (SOL) muscles of rats. The muscle force was measured by attaching a hook to the tendon using a load cell, and the MMG was measured using a charged-coupled device-type displacement sensor at the middle of the target muscle. The MMG-twitch waveform was very similar to that of the muscle force; however, the half relaxation time and relaxation time (10%), which are relaxation parameters, were prolonged compared to those of the muscle force. The MMG amplitude correlated with the muscle force. Since stimulation frequencies that are necessary to evoke tetanic progression have a significant correlation with the twitch parameter, there is a close relationship between twitch and tetanus in the MMG signal. Therefore, we suggest that the MMG, which is electrically induced and detected by a laser displacement sensor, may be an alternative tool for measuring muscle strength. |
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| Keywords: | Mechanomyogram Tetanus Twitch Fusion index Muscle force |
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