Ankle plantar flexion movements are involved in raising the heel from the ground during gait and calf-raise. In both movements, the trajectory of the maximum point of planter pressure is especially affected by a balance of the activities of the peroneus longus and tibialis posterior muscles, which control inversion and eversion of the calcaneal bone. This study aimed to clarify the relationship between the activities of the peroneus longus and tibialis posterior muscles in raising the heel from the ground during gait and calf-raise. Subjects (5 male, 18 female, aged 22.1±1.4 years) were examined using surface electromyography during gait and calf-raise, which showed the peroneus longus and tibialis posterior muscle activities and their ratio(the peroneus longus muscle activity/the tibialis posterior muscle activity). We calculated the root mean square during the time that the heel was raised from the ground during gait and calf-raise, and root mean square during gait and calf-raise to standing. The results showed that the peroneus longus muscle activity and the ratio between this and tibialis posterior muscle activity that take place from the time the calcaneal bone leaves the ground to when there is maximum planter pressure at the head of metatarsal bones during gait, correlate with muscle activity and ratio during calf-raise. In other words, the greater the peroneus longus muscle activity, the greater the ratio between it and the tibialis posterior in plantar flexion during gait, and the greater these activities and the ratio in plantar flexion during calf-raising. As a result, it can be considered that the location of the maximum point of planter pressure during gait is related to that during calf-raising. Further research is needed to clarify the relationship between the distribution of planter pressure during the gait, and that during calf-raising.