Table 1: Creatine kinase activity (CK) changes after bout 1 and bout 2 in boys, young adult males, and elderly males (mean ± SD).

CK, IU/LBefore24 h after exercise48 h after exercise

Boys
bout 178.8 ± 50.7422.5 ± 211.5*#311.8 ± 236.2*#
bout 275.5 ± 46.1132.8 ± 68.2*102.8 ± 55.4
Young adult
bout 1106.0 ± 38.91102.2 ± 640.9*#$1090.2 ± 784.7*#$
bout 290.4 ± 40.8401.9 ± 182.5*$194.2 ± 76.7*
Elderly
bout 182.7 ± 24.2224.6 ± 113.6*340.8 ± 149.8*#
bout 292.5 ± 47.5164.7 ± 81.5*144.5 ± 55.3*

* , compared with before; # , compared with bout 1; $ , compared with elderly males and boys.