In positional tendons, the IFM is primarily responsible for elastic energy storage through extensive crimping.

The IFM is more glycosaminoglycan-rich in energy-storing tendons, supporting greater interfascicular sliding and energy dissipation during dynamic loading.

The IFM in energy-storing tendons has higher collagen cross-link density, reducing fascicle sliding and favoring elastic recoil.

 The IFM composition and mechanics are identical between both tendon types due to conserved loading conditions.