"The purpose of this study was analysis on the results physical function affected by the mixed training in the moutains infered from heart rate. The subjects in this study were long distance runner of 2 female and 1 male. The influence of physical function was analyisis by the results of heart rate during mixed training. The following results were obtained : 1) The mean of work load during mixed training indcated the numerical value between 70% and 85% of HR_<max> of the subjects. 2) The mean of work load during interval indcated the numerical value between 30% and 65% of HR_<max> of the subjects. 3) The most important things on the interval time for mixed training should be equal to training time. 4) Therfore, the most important things on the mixed training for long distance runner should be considered of %HR_<max> per running speed of each runner by the work load during interval training of mixed."