Repeated Bout Effect Was More Expressed in Young Adult Males Than in Elderly Males and Boys

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/L	Before	24 h after exercise	48 h after exercise
Boys
bout 1	78.8 ± 50.7	422.5 ± 211.5^*#	311.8 ± 236.2^*#
bout 2	75.5 ± 46.1	132.8 ± 68.2*	102.8 ± 55.4
Young adult
bout 1	106.0 ± 38.9	1102.2 ± 640.9^*#$	1090.2 ± 784.7^*#$
bout 2	90.4 ± 40.8	401.9 ± 182.5^*$	194.2 ± 76.7*
Elderly
bout 1	82.7 ± 24.2	224.6 ± 113.6*	340.8 ± 149.8^*#
bout 2	92.5 ± 47.5	164.7 ± 81.5*	144.5 ± 55.3*

 * 𝑃<0.05, compared with before; ^#𝑃<0.05, compared with bout 1; ^$𝑃<0.05, compared with elderly males and boys.