Sedentary young adults ( N = 36 ) were randomly assigned to 1 of 3 groups : ( 1 ) exertion-induced muscle injury and MT ( n = 15 ; mean age SE , 26.6 0.3 ) ; ( 2 ) exertion-induced muscle injury only ( n = 10 ; mean age SE , 23.6 0.4 ) , and ( 3 ) MT only ( n = 11 ; mean age SE , 25.5 0.4 ) .