Electrical Stimulation of Denervated Rat Skeletal Muscle Ameliorates Bone Fragility and Muscle Loss in Early-Stage Disuse Musculoskeletal Atrophy
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We tested whether daily muscle electrical stimulation (ES) can ameliorate the decrease in cortical bone strength as well as muscle and bone geometric and material properties in the early stages of disuse musculoskeletal atrophy. 7-week-old male F344 rats were randomly divided into three groups: age-matched control group (Cont); a sciatic denervation group (DN); and a DN + direct electrical stimulation group (DN + ES). Denervated tibialis anterior (TA) muscle in the DN + ES group received ES with 16 mA at 10 Hz for 30 min/day, 6 days/week. Micro CT, the three-point bending test, and immunohistochemistry were used to characterize cortical bone mechanical, structural, and material properties of tibiae. TA muscle in the DN + ES group showed significant improvement in muscle mass and myofiber cross-sectional area relative to the DN group. Maximal load and stiffness of tibiae, bone mineral density estimated by micro CT, and immunoreactivity of DMP1 in the cortical bone tissue were also significantly greater in the DN + ES group than in the DN group. These results suggest that daily ES-induced muscle contraction treatment reduced the decrease in muscle mass and cortical bone strength in early-stage disuse musculoskeletal atrophy and is associated with a beneficial effect on material properties such as mineralization of cortical bone tissue.
KeywordsElectrical stimulation Muscle contraction Denervation Bone strength Dentin matrix protein
This study was supported in part by a Grant-in-Aid for Scientific Research (KAKENHI Grant Nos. 25350829, 25282163, 16K13021), and by a Grant-in-Aid for Developed Research from the Niigata University of Health and Welfare. The authors are grateful to the Niigata Bone Science Institute for technical support.
Author HT designed the study and prepared the first draft of the paper; Authors HT, KY, FO, KN, and NK performed experiments; Authors HT, KS, and HK analyzed data; Authors HT, HO, and NY interpreted results of experiments; Authors HT and HK prepared figures; Authors HT, HO, and NK edited and revised manuscript; All authors approved the final version of the manuscript.
Compliance with Ethical Standards
Conflict of interest
Hiroyuki Tamaki, Kengo Yotani, Futoshi Ogita, Keishi Hayao, Kouki Nakagawa, Kazuhiro Sugawara, Hikari Kirimoto, Hideaki Onishi, Norikatsu Kasuga, and Noriaki Yamamoto declare no conflict of interest.
Human and Animal Rights and Informed Consent
All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. All procedures performed in studies involving animals were in accordance with the ethical standards of the institution or practice at which the studies were conducted.
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