Age periods of accelerated improvement of muscle strength, power, speed and endurance in the age interval 6-18 years - Viru, A.; Loko, J.; Volver, A.; Laaneots, L.; Karelson, K.; Viru, M. (Biology of Sport, 1998)
Keywords: junior elite sport; physical conditioning ability; age; physical development; strength; speed strength; speed; endurance; aerobic; Poland; junior sports