Differences in MOTS-c (A) and Humanin (B) serum levels among
non-athletes, low-moderate endurance athletes, and high endurance athletes. A
linear regression model was generated for both factors serum readings, MOTS-c
readings were cube transformed, and humanin readings were log-transformed. Ns =
non-significant, *** = p 0.005, **** = p 0.0005.