Numerous measurable parameters provide valuable information when assessing the health of the musculoskeletal system. These range from bone density and maximum muscle strength to muscle stiffness. The measurement of muscle stiffness is critical, as this increases with muscle loss in zero gravity or during extended bed rest (e.g., due to prolonged hospital stays). A method to isolate a single muscle and evaluate its stiffness was initially used with the MARES system and now needs to be assessed for its applicability to the Isomed system. Isokinetic contraction on the footplate would be ideal when the plate tilts, resulting in a change in muscle length and torque, which allows for the stiffness calculation. However, since the Isomed only releases at a certain threshold, a ramp that the participant must follow is necessary to reach the threshold. This also ensures the comparability of the data. For this purpose, a custom electronics system was developed to adjust the voltage range of the Isomed’s analog output. This voltage is read by an analog-digital-converter (ADC) and displayed in the Python-based user interface. The interface enables the measurement of the Maximum Voluntary Contraction (MVC), based on which a ramp is shown on the monitor. The participant must follow the ramp until the threshold is reached. The measured data is stored, and configurations can be made within the system. The entire setup is powered by two power banks and housed in a 3D-printed case.
Development of a Graphical User Interface for Muscle Physiology Studies
Wakolbinger, L. (Author). 2024
Student thesis: Master's Thesis