Eight mild asthmatic ( age = @ yr ; VO@peak = @ mLkgmin ) and nine nonasthmatic ( age = @ yr ; VO@peak = @ mLkgmin ) adults performed constant workrate cycling exercise to exhaustion after four separate interventions : @ ) a control trial ( CON ) ; @ ) inhalation of fast-acting @-agonist ( BD ) ; @ ) eucapnic voluntary hyperpnea challenge ( BC ) ; and @ ) sham to the hyperpnea ( SHAM ) .