Their shoulders must be rubbed every hour and they must be allowed to shake the lactic acid buildup out of their joints each hour.
Gary Paulsen -- Woodsong
They were aquatic mammals - a link with the prehistoric past - web-footed egglayers; teat-less milk producers - the lactic fluid being exuded through the female’s skin pores; poison-fanged amphibians, with fangs in the hollow of the male’s hind feet.
James Vance Marshall -- Walkabout
My entire body aches, especially my legs, which burn with lactic acid even when I am not moving.
Veronica Roth -- Insurgent
Sir Launcelot got up steam, he and I loaded up the kettle with unslaked lime and carbolic acid, with a touch of lactic acid added thereto, then filled the thing up with water and inserted the steam-spout under the canopy.
Mark Twain -- A Connecticut Yankee in King Arthur’s Court
By the third day the lactic acid and muscle shock had finally worn off, and I could use my arms again.