Abstract: Objective To compare the differences of electrical activity in calf muscle of children with growing pains from normal children when standing and heel raising. Methods 32 children with growing pains and foot pronation were as growing pains group, and 32 normal children as control group. All the children were measure with surface electromyography (sEMG) of tibialis anterior, peroneus longus, medial gastrocnemius and tibialis posterior when standing and heel raising. Results The root mean square (RMS) of peroneus longus increased significantly in growing pains group when standing (P<0.01). The RMS decreased significantly in medial gastrocnemius (P<0.05) and increased significantly in tibialis posterior (P<0.01) when heel raising. Conclusion The characteristics of electrical activity in calf muscle is difference from the normal in the growing pains children with foot pronation during standing and heel raising.

Key words: growing pains, relaxed calcaneal stance position, foot pronation, surface electromyography, root mean square