CHANGES IN THE STIFFNESS OF THIGH MUSCLES IN THE LEFT AND RIGHT LIMBS DURING SIX WEEKS OF PLYOMETRIC TRAINING IN VOLLEYBALL PLAYERS Journal title: Polish Journal of Sport and Tourism Authors: DARIUSZ MROCZEK, EDWARD SUPERLAK, MAREK KONEFAŁ, KRZYSZTOF MAĆKAŁA, PAWEŁ CHMURA, TOMASZ SEWERYNIAK,... Subject(s):
