HighclereRackBox.smallWe developed an experimental system to measure the volume and mix of gases during (normally controlled) exercise. Gases analysed included oxygen (O2) and carbon dioxide (CO2) as well as the flow rates using solid state sensors. Using custom PCBs (our Highclere platform), in-house software, 3D printed parts and various gas sensors we calculated parameters, such as VO2max, normally only available on high-end equipment.