01552nas a2200253   4500008004100000022001400041245007000055210006900125260001200194300001400206490000700220520079000227653002601017653003601043653001801079653002301097653002401120653002701144100002001171700001501191700002401206700002101230856004701251       1980                        eng d  a0140-011800aElectromagnetic method for in situ stretch of individual muscles.0 aElectromagnetic method for in situ stretch of individual muscles  c03/1980  a145–1520 v183 aA technique for stretching individual muscles in intact behaving animals via chronic intramuscular implantation of a permeable slug and use of an external electromagnet to apply force to the slug has been developed for use in the study of the role of sensory input due to muscle stretch in the control of skilled motor activity. This paper is an analysis of the force exerted on a permeable slug by a solenoid, and a discussion of practical aspects of design and control. The force exerted on a slug inside a coil is a function of slug length, cross-sectional area, and magnetisation properties and of coil size, geometry, and current. The force inside the coil may be increased by surrounding the coil with a permeable sleeve and thereby increasing the field strength inside the coil.10aElectromagnetic force10aElectromagnetic muscle strength10aMotor control10aMuscle stimulation10aSensorimotor system10aStimulation with force1 aColburn, T., R.1 aVaughn, W.1 aChristensen, J., L.1 aWolpaw, Jonathan  uhttp://www.ncbi.nlm.nih.gov/pubmed/6771473