In working skeletal muscle under anaerobic conditions, glyceraldehyde 3-phosphate is converted to pyruvate (the payoff phase of glycolysis), and the pyruvate is reduced to lactate .

骨骼氧条件下工作，3-磷酸甘油转变成丙酮酸(糖酵解的段)，丙酮酸又转变成乳酸。