The present study was to investigate effect of one-week mild altitude training on glucose uptake and endurance performance in high school track athletes. Ten athletes were examined before and after one-week altitude training. Oral glucose tolerance test (OGTT) was performed on the pre- and post of altitude training (altitude 1,800m). The results of this study appeared that one-week mild altitude training improved glucose uptake, and insulin sensitivity, and running performance (distance for 12-min run). In conclusion, the mild altitude training improved glucose uptake and insulin sensitivity, and running performance.