 This study found that the Cybex norm registered by HUMAC and the C-station by physiometer are reliable and valid tools for measuring plantar flexor strength. Both devices showed strong correlations between measurements taken with each other, indicating that they can be used interchangeably. Additionally, the C-station had high inter-rater reliability, meaning that it could be used repeatedly without significant variation in measurement. These findings suggest that the C-station may be a viable alternative to the more expensive and cumbersome IKD, making it easier and faster to measure plantar flexor strength. This article was authored by Seth O'Neill, Alice Weeks, Jens for example Norgaard, and others.