40 male KM mice of 12 months were randomly divided into 4 groups: the aged control, 10 minute exercise, 20 minute exercise, 40 minute exercise, and 10 mice per each group.

• 选取40只12月龄雄性昆明小鼠,随机分成老年对照组、10分钟运动组、20分钟运动组和40分钟运动组,每组10只;