6M Wolfrum,B Knechtle, Sex - related differences and age of peak perfmxnanee in breaststroke versus freestyle swimming [ J]. Bmc Sports Science Medicine & Rehabilitation, 2013, 5 (1) :29 -29.
7Wild, Stefanie,Riist, Christoph Alexander, Changes in sex differ- ence in swimming speed in finalists at FINA World Championships and the Olympic Games from 1992 to 2013[J] . BMC Sports Sci- ence, Medicine & Rehabilitation,2014(4) :1:43.
8Lauer, Jessy, Olstad, Breaststroke swimmers moderate internal work increases toward the highest stroke frequencies [ J]. Journal of Biomechanics, 2015,12 (48): 30-41.
10Strzala, Marek. Krezalek, lntra - Cyclic Phases of Arm - Leg Movement and Index of Coordination in Relation to Sprint Breast- strokeSwimming in Young Swimmers[ J]. Journal of Sports Science & Medicine, 2013,4(12) :690 -698.
