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Presently, the most extensive study of collegiate women's softball injury epidemiology is the 2007 study of NCAA data from 1988–1989 through 2003–2004. Although baseball injuries have been examined extensively, few authors have described the epidemiology of injuries in softball, especially at the high school level. Given the large proportion of female student-athletes participating in softball, it is important to examine injury incidences in high school girls' and collegiate women's softball. 1 Similarly, in the National Collegiate Athletic Association (NCAA), softball was the sport with the fourth-most female student-athletes participating softball players comprised 9% of all NCAA female student-athletes. In the 2013–2014 academic year, softball was the fifth most common sport played by high school females, played by 11% of female high school athletic participants. Bats that received the waiver were able to be used in high school play across the country (including California) in 2011.Softball is played by a large proportion of female student-athletes at the high school and collegiate levels. This procedure tested composite baseball bats after they had been broken-in to ensure they were not too hot for play. In order to receive this waiver, their baseball bats had to undergo Accelerated Break-In (ABI) testing. After composite-barreled adult baseball bats were banned by the NFHS and NCAA in 2010, baseball bat manufacturers were allowed to apply for a waiver for certain baseball bats. Check with your organization before purchasing a composite-barreled baseball bat.īall Exit Speed Ratio (BESR) was the former standard that governed adult baseball bats. Many unsanctioned high school baseball organizations have followed suit in implementing the NFHS standards for composite baseball bats. Even BESR Certified baseball bats with alloy barrels are not legal for play in California in 2011 unless they have received the ABI waiver. Starting Jan 1, 2011, the California Interscholastic Federation (CIF) requires that all non-wood baseball bats must be BBCOR Certified or on the BESR-ABI approved list. Beginning January 1, 2012, all non-wood baseball bats used in high school play must be BBCOR Certified. Outside of California, all BESR certified baseball bats with alloy barrels remained legal until January 1, 2012. As of January 1, 2011, all non-wood baseball bats must be BBCOR certified to be used in NCAA and collegiate play.