Helen started, and said she feared she had been sitting too long idle. – Maria Edgeworth (1768–1849), Helen, 1834

I am writing this at my standing desk, which is against the window. The window offers a pleasant prospect over the lime trees and sun-bathed hills — delightful natural scenery. – Friedrich Nietzsche, letter to sister Elisabeth, 1862, wording slightly altered

I believe most distempers proceed from too much sitting still. РMarie de Rabutin-Chantal, letter to her daughter Fran̤oise-Marguerite de S̩vig

Throughout the illness the most obviously exciting cause of the attacks was posture, stopping over a writing-desk; and he ultimately had to do such work either kneeling or at a standing desk. – Lawson Tait, 1882