Creatine Kinase Response of Physically Active Young Men to One- and Two-Legged Cycling

The purpose of the study was to compare blood creatine kinase (CK) concentration of 15 physically active healthy male after one- and two-legged cycling. After the procedures were explained, the subjects went to the laboratory on four occasions. The first was a familiarization session. During sessions 2, 3, and 4, the subjects performed one- and two-legged maximal tests that were separated by 48 to 72 hrs. A blood sample was taken before and 24 hrs after each test to determine blood CK responses. After the twolegged exercise, blood CK responses (7.14 ± 201.87 U/l) were significantly lower (P