Figure 6

Relationships for mechanomyographic (MMG) amplitude and mean power frequency (MPF) versus power output during incremental cycle ergometry. The top graph shows the linear relationship between normalized mechanomyographic (MMG) amplitude (%max) for the vastus lateralis muscle and normalized power output. The bottom graph demonstrates the lack of a significant relationship between normalized MMG mean power frequency (MPF, %max) for the vastus lateralis muscle and normalized power output. The data presented are from one subject, and the MMG signals were recorded with a contact sensor (HP 21050A) during an incremental cycle ergometer test to exhaustion.