What is the type of fibres activated in this situation? Fast glycolytic fibres or all types within the same muscle? is the force distributed equally between different types of fibres?
What is the type of contraction? Isometric or Concentric?
What is the type of stimulation? Forward or inverse stimulation?
Is the Hill model still applicable in that case?
A temporary external force upon the shoulder to meet the resistance, first would be concentric then isometric to meet the resistance if that is the goal. After an unplanned release of the external force then a concentric contraction followed by a rapid eccentric contraction via reflexive system. The amount and types of fibers would be related to the rate and amount of force provided as well as the ability and prior "training" of the specific person. This question is multifaceted and is not simple to answer, however, the references below may help you;
.Myers JB, Lephart SM. The role of the sensorimotor system in the athletic shoulder. J Athl Train. 2000;35:351-363
McIlroy WE and Maki BE. Early activation of arm muscles follows external perturbation of upright stance. Neurosci Lett 184: 177–180, 1995
Maki BE and McIlory WE. The role of limb movements in maintaining upright stance: the “change-in-support” strategy. Phys Ther 77: 488–507, 1997
.Myers JB, Riemann BL, Ju YY, et al. Shoulder muscle reflex latencies under various levels of muscle contraction. Clin Orthop. 2003;402:92101.
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