|（Laboratory of Laser Sports Medicine，South China Normal University，Guangzhou 510631，China）
Abstract: Homeostasis is the maintenance of a steady state and its steady functions. The homeostasis in sports training was found to be sport-specific so that it is called sport-specific homeostasis (SSH). Athletes’ systems might be classified as SSH-essential system (SES) and SSH-non-essential system (SNS). The quality of SES homeostasis (SESH) represents sports capacity. The higher the SESH quality, the higher the sports capacity. The quality of the SNS homeostasis (SNSH) represents the expression of sports capacity. The higher the SNS quality, the more im-proved the sports performance. Athletes’ training might be also classified into two kinds, the extraordinary training (ET) such as DOMS to establish the SESH of higher quality by destroying the former SESH, and the ordinary train-ing (OT) such as tapering, fitness training, psychological training and spirit training to maintain SESH, and to estab-lish and maintain SNSH. The training ladder should be ET1-OT1-ET2-OT2-…-OTn-competition (EC); EC1-EC2-…-. Performance-enhanced competition might be of critical importance after OT induced recovery from ET induced fa-tigue.
Key words: exercise training；homeostasis；sport capacity；performance；performance-enhanced competition