Subjects ( n = 18 ; age 4914 y ; fasting glucose 10511 mg/dL ; 2 h glucose 17032 mg/dL ) completed a peak O2 consumption/lactate threshold ( LT ) protocol plus three randomly assigned conditions : 1 ) control , 1 hour of seated rest , 2 ) MIE ( at LT ) , and 3 ) HIE ( 75 % of difference between LT and peak O2 consumption ) .