Title
Electromechanical modulation of catabolic and anabolic pathways in chronically inactive, but neurally intact, muscles
Document Type
Article
Publication Date
2010
Publication Title
Muscle & Nerve
Department
Exercise Science
Abstract
The extent and mechanisms by which neural input regulates skeletal muscle mass remain largely unknown. Adult spinal cord isolated (SI) rats were implanted unilaterally with a microstimulator, whereas the contralateral limb served as SI control (SI-C). A 100-HZ, 1-s stimulus was delivered every 30 s for 5 min, followed by a 5-min rest. This was repeated six times consecutively (SI-Stim1) or with a 9-h interval after the third bout (SI-Stim2) for 30 days (1 min of daily activity). SI-Stim1 and SI-Stim2 paradigms attenuated plantaris atrophy by 20% and 38%, respectively, whereas only SI-Stim2 blunted soleus atrophy (24%) relative to SI-C. Muscle mass changes occurred independent of the IGF-1/PI3K/Akt pathway. No relationships between SI or electromechanical stimulation and expression of several atrophy markers were observed. These data suggest that regulatory mechanisms for maintaining muscle mass previously shown in acute states of atrophy differ substantially from those observed in chronic states. Muscle Nerve, 2010
ISSN
0148-639X
WorldCat Link
Provider Link
Citation
Kim, JA, RR Roy, SJ Kim, H Zhong, F Haddad, KM Baldwin, and VR Edgerton. "Electromechanical Modulation of Catabolic and Anabolic Pathways in Chronically Inactive, but Neurally Intact, Muscles." Muscle & Nerve. 42.3 (2010): 410-21. Print.