Thread:Shabook/@comment-27364856-20151215055311/@comment-112155-20151219161525

The second image is not an in-universe source, and therefore, non-canon if it contradicts what it is said or portrayed on-screen.

Since Captain America: The First Avenger, it's been stated that Captain America is a perfect human specimen, but not superhuman. However, just like a regular man can perform amazing feats of strength in extreme cases (adrenaline, etc.), Cap can tap into the early levels of superhuman strength in extreme cases.

At least that's what I've always believed it's been said and portrayed on-screen, and what's written in our articles.