Hello All: Ergometer calibration is essential for valid assessment of exercise protocols. In many cases researchers must rely on "factory calibration" which may or may not be accurate. In my lab we are about to perform and exercise intervention using consumer level exercise bikes. Given the uncertainty of power measures reported by these bikes we knew that calibration or post hoc correction of data would be essential. This particular study was funded by a small grant from the College of Health at the University of Utah and did not include enough funds to buy an ergometer calibrator as offered for $17,500USD by VacuMed. So we constructed our own simple but effective and accurate calibrator. Key elements include: SRM Powermeter, 1.5 hp 100rpm gear motor, and a variable frequency drive. A video can be seen at this link: http://files.utah.edu/neuromuscular_files/CalJig.MOV Be aware that this is a ~250meg file. Some browswers will attempt to play it when you click on it. When this happens the first showing of the video may be very choppy depending on your connection speed. Playing it again, however, was smooth on the systems I used to test it out. I hope that this will be useful to you. If you have any questions please feel free to post here. If Will would like to see additional detail perhaps I could write up a short article for SportSci. Cheers, Jim
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