Vibration frequency response function can be calculated, thereby characterizing the system. This technique is used in the field of experimental modal analysis to determine the vibration characteristics of a structure. The simple mass–spring–damper model is the foundation of vibration analysis, but what about more complex systems? The mass–spring–damper model described above is called a single degree of freedom (SDOF) model since the mass is assumed to only move up and down. In more complex systems, the system must be discretized into more masses that move in more than one direction, adding degrees of freedom. The major concepts of multiple degrees of
Motor unit number estimation the death of motor fibres, but the number of motor units remains the same until the disease progresses to a very severe state. In collaboration with other electromyography techniques, these conditions can be diagnosed and monitored. In a similar vein, normal aging also reduces the number of motor units but not to the same degree as disease. The effects of injury depend on the circumstances. Motor unit number estimation Motor Unit Number Estimation (MUNE) is a technique that uses electromyography to estimate the number of motor units in a muscle. A motor unit consists of one alpha motor neuron and