This Wikipedia article discusses the origins of the initial-stress-derived noun:
In English, since the early modern period, polysyllabic nouns tend
to have an unstressed final syllable, while verbs do not. Thus, the
stress difference between nouns and verbs applies generally in
English, not just to otherwise-identical noun-verb pairs. The
frequency of such pairs in English is a result of the productivity of
When "re-" is prefixed to a monosyllabic word, and the word gains
currency both as a noun and as a verb, it usually fits into this
pattern, although, as the following list makes clear, most words
fitting this pattern do not match that description.
Many of these have first syllables that evolved from Latin
prepositions, although again that does not account for all of them. . . .
When the stress is moved, the pronunciation, especially of vowels,
often changes in other ways as well. Most common is the reduction of a
vowel sound to a schwa when it becomes unstressed.