|（Department of Physical Education，Hengyang Normal University，Hengyang 421008，China）
Abstract: To analyze physiological and biochemical character after isopower cycling, and to look for the law of emergency and recovery of isopower cycling-induced fatigue. Methods: 15 male students were subjected to 5 cy-cling tests with isopower 300W and different resistance. Duration, heart rate and blood pressure were documented immediately after every test, hemoglobin (Hb), bloody urine (BU) and creatine kinase (CK) were detected immedi-ately after exercise and the next morning. Results and conclusion: In emergency and recovery of isopower cy-cling-induced fatigue, the contractive frequency of working muscle is in contrast to the contractive force. The in-crease of contractive frequency of working muscle is prone to induce increase in heart rate and injury of hemoglo-bin, the increase of contractive force of working muscle is prone to induce increase in blood pressure and delay of BU and CK recovery.
Key words: exercise physiology；exercise biochemistry；isopower；exercise-induced fatigue