The best replacement for muscle contraction is skeletal muscle contraction.

The best alternatives to muscle contraction are rated as following:
★★★★★  skeletal muscle contraction
★★★★  isometric
★★★  action potential
★★★  concentric
★★★  skeletal
★★  muscle twitch
★★  cardiac
★  isotonic muscle contraction
★  smooth muscle contraction

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Speaking about muscle contraction, one probably shouldn't forget about atp.

Other search terms related to muscle contraction and their ratings are:
★★★★★ atp
★ acetylcholine
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Google Trends

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muscle contraction
skeletal muscle contraction
isometric