“…Nine of the 15 training studies were categorized as being Level II (Eyigor et al, 2009;Federici et al, 2005;Hackney et al, 2007;Holmerová et al, personal communication;Hopkins et al, 1990;McKinley et al, 2008;Shigematsu et al, 2002;Sofianidis et al, 2009;Young, Weeks, & Beck, 2007), with the other six training studies being Level III-V (Engels et al, 1998;Jeon et al, 2005;Jeon et al, 2000;Kim et al, 2003;Kudlacek et al, 1997;Song et al, 2004). All three cross-sectional studies were categorized as being Level IV (Uusi-Rasi et al, 1999;Verghese, 2006;Zhang, Ishikawa-Takata, Yamazaki, Morita, & Ohta, 2008).…”