During physical exercise myocardial tissue increase its metabolism of subtract as the exercise intensity increasing, myocardium not only takes up lactate, but also produce lactate.

• 运动时,随运动强度的增加,心肌组织内源性、外源性能源物质的消耗均增加,心肌不但吸收乳酸,而且自身也产生乳酸。